{"id":16185,"date":"2020-09-04T16:06:28","date_gmt":"2020-09-04T14:06:28","guid":{"rendered":"https:\/\/www.rct-online.de\/magazin\/?p=16185"},"modified":"2026-02-25T14:49:28","modified_gmt":"2026-02-25T13:49:28","slug":"glass-screw-threads","status":"publish","type":"post","link":"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/","title":{"rendered":"Glass Screw Threads: Types, Standards &#038; Applications"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_73 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#The_Thread_and_the_Introduction_of_Standardization\" title=\"The Thread and the Introduction of Standardization\">The Thread and the Introduction of Standardization<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#%E2%80%A6_and_the_Glass_Thread\" title=\"\u2026 and the Glass Thread\">\u2026 and the Glass Thread<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#Classification_of_Threads\" title=\"Classification of Threads\">Classification of Threads<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#The_G_12%E2%80%B3_Thread\" title=\"The G 1\/2\u2033 Thread\">The G 1\/2\u2033 Thread<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#The_GL_14_Thread\" title=\"The GL 14 Thread\">The GL 14 Thread<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#The_GL_Glass_Thread\" title=\"The GL Glass Thread\">The GL Glass Thread<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#Glass_Threads_and_Their_Advantages_%E2%80%A6\" title=\"Glass Threads and Their Advantages \u2026\">Glass Threads and Their Advantages \u2026<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#Applications_of_Glass_Threads\" title=\"Applications of Glass Threads\">Applications of Glass Threads<\/a><\/li><\/ul><\/nav><\/div>\n<p style=\"text-align: justify;\"><strong>The &#8220;Archimedean screw,&#8221; invented by the ancient mathematician and engineer Archimedes of Syracuse (c. 287\u2013212 BC) and named after him, was used for irrigating fields and can be regarded as the first thread in human history. However, not all threads are the same. Different materials and sometimes cryptic designations make it difficult to gain an overview. The following article briefly outlines the more recent history of threads and the many areas where glass threads are used today.<\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"The_Thread_and_the_Introduction_of_Standardization\"><\/span>The Thread and the Introduction of Standardization<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">At the end of the 17th century, the production of screws and nuts began in the town of Velbert, located about 20 km northeast of D\u00fcsseldorf in Germany. Threaded fastening proved far more secure for mounting on wooden substructures than simple nailing, and it also enabled assembly on metal bases in the first place.<\/p>\n<p style=\"text-align: justify;\">Although fundamental knowledge about threads spread quickly, screws and nuts produced by different manufacturers were generally not interchangeable. Their dimensions were tailored to specific applications, meaning that almost every piece was effectively unique.<\/p>\n<p><center><a href=\"https:\/\/www.rct-online.de\/en\/fasteners\/nuts\/30398\/hex-nut-din-934-made-of-pc\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5473 size-full\" title=\"Hex Nut (German standard DIN 934 \/ ISO 4032) made of PC\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/sechskantmutter-din-934-aus-pc.jpg\" alt=\"Hex Nut (German standard DIN 934 \/ ISO 4032) made of PC\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/sechskantmutter-din-934-aus-pc.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/sechskantmutter-din-934-aus-pc-150x150.jpg 150w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a> <a href=\"https:\/\/www.rct-online.de\/en\/fasteners\/screws\/crossed-pan-head\/30498\/slotted-countersunk-head-screw-din-963-made-of-pa\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5474 size-full\" title=\"Slotted Countersunk Head Screw (German standard DIN 963 \/ ISO 2009) made of PA\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/senkkopfschraube-din-963-aus-pa-mit-schlitz.jpg\" alt=\"Slotted Countersunk Head Screw (German standard DIN 963 \/ ISO 2009) made of PA\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/senkkopfschraube-din-963-aus-pa-mit-schlitz.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/senkkopfschraube-din-963-aus-pa-mit-schlitz-150x150.jpg 150w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/center><\/p>\n<p style=\"text-align: justify;\">It was not until the mid-19th century that the English engineer Sir Joseph Whitworth (1809\u20131887) proposed standardizing different thread types according to defined parameters to ensure uniform use. The standardized Whitworth threads named after him quickly became established throughout Europe. Their characteristic dimensions were specified in imperial units, which is why Whitworth threads are also referred to as &#8220;inch threads.&#8221; Today, however, the metric system has largely prevailed for thread sizes.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%E2%80%A6_and_the_Glass_Thread\"><\/span>\u2026 and the Glass Thread<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">Glass production has a long tradition dating back to antiquity. With the development of the chemical industry in the mid-19th century, demand grew for laboratory glassware that could be assembled from standardized components.<\/p>\n<p><center><a href=\"https:\/\/www.rct-online.de\/en\/tube-hose-connectors\/connectors-made-of-plastic\/glass-thread-adapter\/28937\/glass-thread-adapter-made-of-pbt\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5495 size-full\" title=\"Glass-Thread Adapter made of PBT\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/glasgewinde-adapter-aus-pbt.jpg\" alt=\"Glass-Thread Adapter made of PBT\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/glasgewinde-adapter-aus-pbt.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/glasgewinde-adapter-aus-pbt-150x150.jpg 150w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a> <a href=\"https:\/\/www.rct-online.de\/en\/tube-hose-connectors\/connectors-made-of-plastic\/glass-thread-adapter\/28938\/glass-olive-adapter-made-of-pbt\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5496 size-full\" title=\"Glass Olive Adapter made of PBT\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/glasoliven-adapter-aus-pbt.jpg\" alt=\"Glass Olive Adapter made of PBT\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/glasoliven-adapter-aus-pbt.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/glasoliven-adapter-aus-pbt-150x150.jpg 150w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/center><\/p>\n<p style=\"text-align: justify;\">In addition to two-part ball and flat joints, paired conical ground joints are now among the most commonly used connections. They enable tight and even vacuum-resistant plug-in connections between glass components, allowing the straightforward assembly of larger systems. In more recent times, threaded connections using glass threads have also become successfully established in chemical laboratories.<\/p>\n<p style=\"text-align: justify;\">Because their production is significantly less complex than that of ground joints, the manufacture of specialty glass components with <a href=\"https:\/\/www.rct-online.de\/en\/tube-hose-connectors\/connectors-made-of-plastic\/glass-thread-adapter\">glass threads<\/a> has experienced a real boom over the past 50 years, driven by companies such as SCHOTT AG (Mainz, Germany), Normag Labor- und Prozesstechnik GmbH (Thuringia, Germany), and Corning Inc. (USA).<\/p>\n<figure id=\"attachment_5465\" aria-describedby=\"caption-attachment-5465\" style=\"width: 253px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5465\" title=\"Standard mineral water bottle\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/Normbrunnenflasche-Mineralwasser.jpg\" alt=\"standard-mineral-water-bottle-glass-thread\" width=\"253\" height=\"500\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/Normbrunnenflasche-Mineralwasser.jpg 304w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/Normbrunnenflasche-Mineralwasser-152x300.jpg 152w\" sizes=\"(max-width: 253px) 100vw, 253px\" \/><figcaption id=\"caption-attachment-5465\" class=\"wp-caption-text\">Glass threads in everyday life: the standardized reusable mineral water bottle<\/figcaption><\/figure>\n<p style=\"text-align: justify;\">Nevertheless, none of these manufacturers could market their products successfully if the glass threads of one producer were not compatible with those of another.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Classification_of_Threads\"><\/span>Classification of Threads<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">It was not until the 1960s that, in addition to the existing imperial system, the metric system\u2014which had developed alongside industrialization\u2014was incorporated into ISO standards for mechanical fasteners. This 1963 standardization was later superseded in 1996 by ISO 1502 and the corresponding German standards DIN 13 and DIN 14, which defined what is known as the &#8220;metric ISO thread.&#8221;<\/p>\n<blockquote>\n<p style=\"text-align: justify;\">Despite differing units of measurement, all threads\u2014whether made of metal or glass\u2014share many similarities.<\/p>\n<\/blockquote>\n<p style=\"text-align: justify;\">A distinction is made between internal and external threads, as well as between right-hand and left-hand threads, designated RH and LH. The majority are right-hand threads (RH). Further identification\u2014regardless of material (metal, plastic, or glass)\u2014is provided by letters, numbers, and the so-called double prime (\u2033), indicating inches. But what do these abbreviations mean?<\/p>\n<h3><span class=\"ez-toc-section\" id=\"The_G_12%E2%80%B3_Thread\"><\/span>The G 1\/2\u2033 Thread<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">The letter G stands for BSP (British Standard Pipe), an imperial Whitworth pipe thread. The fraction 1\/2 indicates the nominal size in inches, while the superscript double prime symbol (\u2033) denotes the unit &#8220;inch.&#8221; In this example, it is therefore a half-inch Whitworth pipe thread. Due to its cylindrical design, this thread type is not self-sealing.<\/p>\n<figure id=\"attachment_5470\" aria-describedby=\"caption-attachment-5470\" style=\"width: 450px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5470\" title=\"The 1\/2&quot; Whitworth pipe thread\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/Whitworth-Rohrgewinde.jpg\" alt=\"Whitworth-pipe-thread\" width=\"450\" height=\"311\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/Whitworth-Rohrgewinde.jpg 600w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/Whitworth-Rohrgewinde-300x207.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/Whitworth-Rohrgewinde-110x75.jpg 110w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><figcaption id=\"caption-attachment-5470\" class=\"wp-caption-text\">The 1\/2&#8243; Whitworth pipe thread: the outer diameter of approx. 20 mm (about \u00be inch)<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"The_GL_14_Thread\"><\/span>The GL 14 Thread<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">The abbreviation GL stands for a round thread according to German standard DIN 168. The number following it, here 14, indicates the outer diameter of the thread in millimeters. In this case, external and internal threads differ in their flank angles. The flank angle\u2014also known as the thread profile angle\u2014describes the angle between the thread flanks. For external threads, it is 60\u00b0, while for internal threads it is 30\u00b0. Glass threads with the GL designation fall into this category.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"The_GL_Glass_Thread\"><\/span>The GL Glass Thread<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">Round glass threads (GL) according to German standard DIN 168, which replaced the earlier German standard DIN 40450, feature rounded rather than sharp thread flanks. This offers decisive advantages both in manufacturing and in function. On the one hand, this thread type can be easily produced by molding molten glass. On the other hand, due to its relatively large pitch and broad flanks, it provides comparatively high load-bearing and tensile strength.<\/p>\n<blockquote>\n<p style=\"text-align: justify;\">Compared to other thread types, the rounded geometry of glass threads results in more resilient thread clearance, improved resistance to contamination, and reduced sensitivity to mechanical damage.<\/p>\n<\/blockquote>\n<h2><span class=\"ez-toc-section\" id=\"Glass_Threads_and_Their_Advantages_%E2%80%A6\"><\/span>Glass Threads and Their Advantages \u2026<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">A key advantage of glass threads lies in the material itself. Glass is easy to clean and can be sterilized using all common methods where required.<\/p>\n<p style=\"text-align: justify;\">Glass thread connections are easily detachable screw fittings and, unlike ground joints, do not require grease for sealing. Grinding grease can cause contamination and may harden under the influence of temperature and chemicals, making especially conical ground joints difficult or even impossible to separate. Ground joints, however, are highly vacuum-resistant\u2014a performance level that threaded connections cannot achieve.<\/p>\n<p><center><a href=\"https:\/\/www.rct-online.de\/en\/laboratory-equipment\/ground-joint-components\/30018\/ground-glass-sleeve-made-of-ptfe\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5477 size-full\" title=\"Ground-Glass Sleeve made of PTFE\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/glasschliffmanschette-aus-ptfe.jpg\" alt=\"Ground-Glass Sleeve made of PTFE\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/glasschliffmanschette-aus-ptfe.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/glasschliffmanschette-aus-ptfe-150x150.jpg 150w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a> <a href=\"https:\/\/www.rct-online.de\/en\/laboratory-equipment\/ground-joint-components\/30022\/high-tech-corrugated-bellows-standard-ground-joint-extension-piece-made-of-ptfe\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5478 size-full\" title=\"High-Tech Corrugated Bellows Standard Ground Joint Extension Piece made of PTFE\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/normschliff-faltenbalg-verlaengerung-aus-ptfe.jpg\" alt=\"High-Tech Corrugated Bellows Standard Ground Joint Extension Piece made of PTFE\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/normschliff-faltenbalg-verlaengerung-aus-ptfe.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/normschliff-faltenbalg-verlaengerung-aus-ptfe-150x150.jpg 150w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/center><\/p>\n<p style=\"text-align: justify;\">The &#8220;classic&#8221; glass thread connection requires plastic screw caps on both sides and an elastic compression ring that ensures sealing. Proven materials for the caps include acetal resin (POM), polyether ether ketone (PEEK), and polybutylene terephthalate (PBT), often reinforced with glass fibers. For sealing elements, chemically resistant plastics are required, frequently polytetrafluoroethylene (PTFE) or other fluoropolymers. In this respect, glass thread connections resemble the conical sealing connectors known from liquid chromatography, such as <a href=\"https:\/\/www.rct-online.de\/en\/tube-hose-connectors\/connectors-made-of-plastic\/capillary-connectors-for-hplc\/28874\/ferrule-made-of-plastics\">ferrules<\/a>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Applications_of_Glass_Threads\"><\/span>Applications of Glass Threads<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">The simple production technologies required for glass threads have opened up a wide range of applications\u2014not only in laboratories.<\/p>\n<p style=\"text-align: justify;\">In laboratory engineering, they are widely used to connect components into more complex glass assemblies, where they can replace rigid and therefore failure-prone conical ground joints. In addition, glass threads with plastic screw caps have proven effective for glass laboratory bottles used for transporting or storing solutions and solvents, which previously had to be sealed exclusively with ground stoppers.<\/p>\n<p><center><a href=\"https:\/\/www.rct-online.de\/en\/tube-hose-connectors\/connectors-made-of-plastic\/glass-thread-adapter\/31228\/thread-adapter-made-of-pp-pvdf-or-pfa-loose-gl-nut\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5506 size-full\" title=\"Thread adapter made of PP, PVDF or PFA - loose GL-nut\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/gewindeadapter-aus-pp-pvdf-oder-pfa-lose-gl-ueberwurfmutter.jpg\" alt=\"Thread adapter made of PP, PVDF or PFA - loose GL-nut\" width=\"300\" height=\"250\" \/><\/a> <a href=\"https:\/\/www.rct-online.de\/en\/tube-hose-connectors\/connectors-made-of-plastic\/glass-thread-adapter\/31225\/pipe-connector-made-of-pp-pvdf-or-pfa-loose-gl-nut\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5507 size-full\" title=\"Pipe Connector made of PP, PVDF or PFA - loose GL-nut\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/rohrverbinder-aus-pp-pvdf-oder-pfa-lose-gl-ueberwurfmutter.jpg\" alt=\"Pipe Connector made of PP, PVDF or PFA - loose GL-nut\" width=\"300\" height=\"270\" \/><\/a><\/center><\/p>\n<p style=\"text-align: justify;\">Pharmaceutical vials and flacons, and above all the countless glass bottles and containers used in households, are also equipped with glass threads, allowing them to be resealed repeatedly with screw caps. These applications likely represent the largest field of use for glass threads, which have even become established in wine bottles.<\/p>\n<figure id=\"attachment_5468\" aria-describedby=\"caption-attachment-5468\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5468 size-full\" title=\"A clear stream of water from the neck of a glass bottle\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/Ein-klarer-Wasserstrahl-aus-dem-Hals-einer-Glasflasche.jpg\" alt=\"glass-bottle-water-stream\" width=\"600\" height=\"400\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/Ein-klarer-Wasserstrahl-aus-dem-Hals-einer-Glasflasche.jpg 600w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/Ein-klarer-Wasserstrahl-aus-dem-Hals-einer-Glasflasche-300x200.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><figcaption id=\"caption-attachment-5468\" class=\"wp-caption-text\">\u00a9 Viktor \u2013 stock.adobe.com<\/figcaption><\/figure>\n<p style=\"text-align: justify;\">Glass threads with screw caps and plastic sealing inserts can even withstand slight internal pressure. A well-known example is the standardized 0.7-liter reusable mineral water bottle introduced in Germany in 1967. According to manufacturers, it can be cleaned and reused up to fifty times and is fully recyclable at the end of its service life.<\/p>\n<p style=\"text-align: justify;\">It is marketed with lightweight metal screw caps or, increasingly, with the distinctive blue caps made of acetal resin (POM-C). However, the almost identical single-use PET bottle appears to be gaining ground\u2014likely because it is significantly lighter than the reusable glass bottle.<\/p>\n<hr \/>\n<pre><strong>Image Sources:<\/strong>\r\nStandard mineral water bottle | \u00a9 Rainer Zenz \u2013 de.wikipedia.org\r\nWhitworth pipe thread | \u00a9 Abrev \u2013 commons.wikimedia.org<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>The &#8220;Archimedean screw,&#8221; invented by the ancient mathematician and engineer Archimedes of Syracuse (c. 287\u2013212 BC) and named after him, was used for irrigating fields and can be regarded as the first thread in human history. However, not all threads are the same. Different materials and sometimes cryptic designations make it difficult to gain an &hellip;<\/p>\n","protected":false},"author":15,"featured_media":12317,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,3028,2744],"tags":[3030,4017,3535,3444,2905,2774,2775,2906,3045],"class_list":["post-16185","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-all-articles","category-alle-beitraege-en","category-chemical-technology-in-action","tag-adapter-en","tag-glass-screw-threads","tag-pa-en","tag-pc-en","tag-pfa-en","tag-pp-en","tag-ptfe-en","tag-pvdf-en","tag-rohrverbinder-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Glass Screw Threads: Types, Standards &amp; Applications - Reichelt Chemietechnik Magazine<\/title>\n<meta name=\"description\" content=\"How are glass threads designed and where are they used? \u2192 \u2705 Types of glass threads \u2705 Advantages &amp; disadvantages \u2705 Application examples\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Glass Screw Threads: Types, Standards &amp; Applications - Reichelt Chemietechnik Magazine\" \/>\n<meta property=\"og:description\" content=\"How are glass threads designed and where are they used? \u2192 \u2705 Types of glass threads \u2705 Advantages &amp; disadvantages \u2705 Application examples\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/\" \/>\n<meta property=\"og:site_name\" content=\"Reichelt Chemietechnik Magazine\" \/>\n<meta property=\"article:published_time\" content=\"2020-09-04T14:06:28+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-25T13:49:28+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/gewinde-aus-glas.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"533\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Sven Weber\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Sven Weber\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"10 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/\",\"url\":\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/\",\"name\":\"Glass Screw Threads: Types, Standards & Applications - Reichelt Chemietechnik Magazine\",\"isPartOf\":{\"@id\":\"https:\/\/www.rct-online.de\/magazin\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/gewinde-aus-glas.jpg\",\"datePublished\":\"2020-09-04T14:06:28+00:00\",\"dateModified\":\"2026-02-25T13:49:28+00:00\",\"author\":{\"@id\":\"https:\/\/www.rct-online.de\/magazin\/#\/schema\/person\/5436b1a88f13d88d14adce42e079dcd3\"},\"description\":\"How are glass threads designed and where are they used? \u2192 \u2705 Types of glass threads \u2705 Advantages & disadvantages \u2705 Application examples\",\"breadcrumb\":{\"@id\":\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#primaryimage\",\"url\":\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/gewinde-aus-glas.jpg\",\"contentUrl\":\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/gewinde-aus-glas.jpg\",\"width\":800,\"height\":533,\"caption\":\"\u00a9 Viktor \u2013 stock.adobe.com\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.rct-online.de\/magazin\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Glass Screw Threads: Types, Standards &#038; Applications\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.rct-online.de\/magazin\/#website\",\"url\":\"https:\/\/www.rct-online.de\/magazin\/\",\"name\":\"Reichelt Chemietechnik Magazine\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.rct-online.de\/magazin\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.rct-online.de\/magazin\/#\/schema\/person\/5436b1a88f13d88d14adce42e079dcd3\",\"name\":\"Sven Weber\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.rct-online.de\/magazin\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/07\/Sven_Weber.jpg\",\"contentUrl\":\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/07\/Sven_Weber.jpg\",\"caption\":\"Sven Weber\"},\"description\":\"Durch und durch Naturwissenschaftler und Musiker: Schon in der Schule waren Sven Weber die naturwissenschaftlichen F\u00e4cher die liebsten, sodass ein Chemie-Studium die einzig logische Konsequenz war. Die Begeisterung f\u00fcr diesen Fachbereich f\u00fchrte letztlich zu einem 2. Staatsexamen als Gymnasiallehrer mit den F\u00e4chern Chemie und Mathematik. Als privater Ausgleich stand und steht die Musik: Das Spielen auf verschiedenen Instrumenten in diversen musikalischen Vereinigungen. Der Ton macht die Musik \u2013 ein f\u00fcr viele Lebensbereiche geltendes Credo! Dann stimmt auch die Chemie!\",\"url\":\"https:\/\/www.rct-online.de\/magazin\/en\/author\/s-weber\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Glass Screw Threads: Types, Standards & Applications - Reichelt Chemietechnik Magazine","description":"How are glass threads designed and where are they used? \u2192 \u2705 Types of glass threads \u2705 Advantages & disadvantages \u2705 Application examples","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/","og_locale":"en_US","og_type":"article","og_title":"Glass Screw Threads: Types, Standards & Applications - Reichelt Chemietechnik Magazine","og_description":"How are glass threads designed and where are they used? \u2192 \u2705 Types of glass threads \u2705 Advantages & disadvantages \u2705 Application examples","og_url":"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/","og_site_name":"Reichelt Chemietechnik Magazine","article_published_time":"2020-09-04T14:06:28+00:00","article_modified_time":"2026-02-25T13:49:28+00:00","og_image":[{"width":800,"height":533,"url":"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/gewinde-aus-glas.jpg","type":"image\/jpeg"}],"author":"Sven Weber","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Sven Weber","Est. reading time":"10 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/","url":"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/","name":"Glass Screw Threads: Types, Standards & Applications - Reichelt Chemietechnik Magazine","isPartOf":{"@id":"https:\/\/www.rct-online.de\/magazin\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#primaryimage"},"image":{"@id":"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#primaryimage"},"thumbnailUrl":"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/gewinde-aus-glas.jpg","datePublished":"2020-09-04T14:06:28+00:00","dateModified":"2026-02-25T13:49:28+00:00","author":{"@id":"https:\/\/www.rct-online.de\/magazin\/#\/schema\/person\/5436b1a88f13d88d14adce42e079dcd3"},"description":"How are glass threads designed and where are they used? \u2192 \u2705 Types of glass threads \u2705 Advantages & disadvantages \u2705 Application examples","breadcrumb":{"@id":"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#primaryimage","url":"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/gewinde-aus-glas.jpg","contentUrl":"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2020\/10\/gewinde-aus-glas.jpg","width":800,"height":533,"caption":"\u00a9 Viktor \u2013 stock.adobe.com"},{"@type":"BreadcrumbList","@id":"https:\/\/www.rct-online.de\/magazin\/en\/glass-screw-threads\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.rct-online.de\/magazin\/en\/"},{"@type":"ListItem","position":2,"name":"Glass Screw Threads: Types, Standards &#038; Applications"}]},{"@type":"WebSite","@id":"https:\/\/www.rct-online.de\/magazin\/#website","url":"https:\/\/www.rct-online.de\/magazin\/","name":"Reichelt Chemietechnik Magazine","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.rct-online.de\/magazin\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/www.rct-online.de\/magazin\/#\/schema\/person\/5436b1a88f13d88d14adce42e079dcd3","name":"Sven Weber","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.rct-online.de\/magazin\/#\/schema\/person\/image\/","url":"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/07\/Sven_Weber.jpg","contentUrl":"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2024\/07\/Sven_Weber.jpg","caption":"Sven Weber"},"description":"Durch und durch Naturwissenschaftler und Musiker: Schon in der Schule waren Sven Weber die naturwissenschaftlichen F\u00e4cher die liebsten, sodass ein Chemie-Studium die einzig logische Konsequenz war. Die Begeisterung f\u00fcr diesen Fachbereich f\u00fchrte letztlich zu einem 2. Staatsexamen als Gymnasiallehrer mit den F\u00e4chern Chemie und Mathematik. Als privater Ausgleich stand und steht die Musik: Das Spielen auf verschiedenen Instrumenten in diversen musikalischen Vereinigungen. Der Ton macht die Musik \u2013 ein f\u00fcr viele Lebensbereiche geltendes Credo! Dann stimmt auch die Chemie!","url":"https:\/\/www.rct-online.de\/magazin\/en\/author\/s-weber\/"}]}},"_links":{"self":[{"href":"https:\/\/www.rct-online.de\/magazin\/en\/wp-json\/wp\/v2\/posts\/16185"}],"collection":[{"href":"https:\/\/www.rct-online.de\/magazin\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.rct-online.de\/magazin\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.rct-online.de\/magazin\/en\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/www.rct-online.de\/magazin\/en\/wp-json\/wp\/v2\/comments?post=16185"}],"version-history":[{"count":13,"href":"https:\/\/www.rct-online.de\/magazin\/en\/wp-json\/wp\/v2\/posts\/16185\/revisions"}],"predecessor-version":[{"id":16198,"href":"https:\/\/www.rct-online.de\/magazin\/en\/wp-json\/wp\/v2\/posts\/16185\/revisions\/16198"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.rct-online.de\/magazin\/en\/wp-json\/wp\/v2\/media\/12317"}],"wp:attachment":[{"href":"https:\/\/www.rct-online.de\/magazin\/en\/wp-json\/wp\/v2\/media?parent=16185"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.rct-online.de\/magazin\/en\/wp-json\/wp\/v2\/categories?post=16185"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.rct-online.de\/magazin\/en\/wp-json\/wp\/v2\/tags?post=16185"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}