Knowing the different screw types and sizes is helpful, but to accurately select the right screw for your project, you\u2019ll likely need to know a little about how screw threads work, as well. So, how do screw threads work? Like the screws themselves, screw threads are designed to meet the needs of specific applications.<\/p>\n\n\n\n
Most commonly referred to as machine screw threads, screws of this style are designed to align with a threaded nut or hole with a matching diameter and thread count. They use Unified Thread Standard (UTS), and are generally available in UNC (Unified National Coarse) and UNF (Unified National Fine) options. Sizes below 1\/4\u2033 use numbers to describe their diameter, while screws 1\/4\u2033 and higher use fractions. Their sizes are described first with the diameter, followed by a hyphen, and then with the count of threads per inch. (Examples: 4-40, 12-24, 5\/16-18)<\/p>\n\n\n\n
Metric Machine Screws are notated in metric diameter and thread pitch. Pitch is the distance, in millimeters, between threads.<\/p>\n\n\n\n
Below are the metric screw and bolt sizes that we carry:<\/p>\n\n\n\n External Threads: External threads (ie: male threads) mean the threads are on the bolts or screws. Threads are sometimes on the nuts rather than the bolts or screws.<\/p>\n\n\n\n Internal Threads: Internal threads (ie: female threads) mean the threads are on the nuts rather than the bolts or screws.<\/p>\n\n\n\n Machine Screw Threads: Machine screw threads are unique in that they are specially designed to mate with threads on nuts or threads present in tapped holes. Not self-tapping threads.<\/p>\n\n\n\n Spaced Threads: Spaced threads are designed to form their own threads in pre-drilled holes. You\u2019ll most often find spaced threads on self-tapping, wood and coach screws.<\/p>\n\n\n\n Lag Screws: Lag screws are just one example of screws that form their own thread in pre-drilled holes. Typically, coach screws are used to fasten metal to wood.<\/p>\n\n\n\n Self-Tapping Screws: Self-tapping screws are threaded to create their own holes when installed. They form a matching thread in whatever material they are installed into. This makes using self-tapping screws incredibly efficient.<\/p>\n\n\n\n Thread-Forming Screws: Used with plastic materials, thread-forming screws feature two separate threads: one high and one low. This makes the pullout strength higher while also ensuring plastic does not crack or otherwise break.<\/p>\n\n\n\n Type U Screws: Type U screws include an unusual spiral thread that is most often driven with a hammer into materials like plastic and metal casings.<\/p>\n\n\n\n Wood Screws: Wood screws feature a tapered shank with sharp threading.<\/p>\n","protected":false},"excerpt":{"rendered":" Knowing the different screw types and sizes is helpful, but to accurately select the right screw for your project, you\u2019ll likely need to know a little about how screw threads work, as well. So, how do screw threads work? Like the screws themselves, screw threads are designed to meet theContinue Reading<\/a><\/span><\/p>\n","protected":false},"author":2,"featured_media":401,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[17],"_links":{"self":[{"href":"https:\/\/lgfastener.com\/index.php?rest_route=\/wp\/v2\/posts\/181"}],"collection":[{"href":"https:\/\/lgfastener.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lgfastener.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lgfastener.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/lgfastener.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=181"}],"version-history":[{"count":1,"href":"https:\/\/lgfastener.com\/index.php?rest_route=\/wp\/v2\/posts\/181\/revisions"}],"predecessor-version":[{"id":182,"href":"https:\/\/lgfastener.com\/index.php?rest_route=\/wp\/v2\/posts\/181\/revisions\/182"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lgfastener.com\/index.php?rest_route=\/wp\/v2\/media\/401"}],"wp:attachment":[{"href":"https:\/\/lgfastener.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=181"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lgfastener.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=181"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lgfastener.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=181"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}M1.6-0.35<\/td> M2-0.4<\/td> M2.5-0.45<\/td> M3-0.5<\/td> M3.5-0.6<\/td><\/tr> M4-0.7<\/td> M5-0.8<\/td> M6-1.0<\/td> M7-1.0<\/td> M8-1.25<\/td><\/tr> M10-1.5<\/td> M12-1.75<\/td> M14-2.0<\/td> M16-2.0<\/td> M18-2.5<\/td><\/tr> M20-2.5<\/td> M24-3.0<\/td> <\/td> <\/td> <\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n Screw Size<\/td> UNC<\/strong><\/td> UNF<\/strong><\/td><\/tr> #0<\/td> <\/td> 0-80<\/td><\/tr> #1<\/td> 1-64<\/td> 1-72<\/td><\/tr> #2<\/td> 2-56<\/td> 2-64<\/td><\/tr> #3<\/td> 3-48<\/td> 3-56<\/td><\/tr> #4<\/td> 4-40<\/td> 4-48<\/td><\/tr> #5<\/td> 5-40<\/td> 5-44<\/td><\/tr> #6<\/td> 6-32<\/td> 6-40<\/td><\/tr> #8<\/td> 8-32<\/td> 8-36<\/td><\/tr> #10<\/td> 10-24<\/td> 10-32<\/td><\/tr> #12<\/td> 12-24<\/td> <\/td><\/tr> 1\/4\u2033<\/td> 1\/4-20<\/td> 1\/4-28<\/td><\/tr> 5\/16\u2033<\/td> 5\/16-18<\/td> 5\/16-24<\/td><\/tr> 3\/8\u2033<\/td> 3\/8-16<\/td> 3\/8-24<\/td><\/tr> 7\/16\u2033<\/td> 7\/16-14<\/td> 7\/16-20<\/td><\/tr> 1\/2\u2033<\/td> 1\/2-13<\/td> 1\/2-20<\/td><\/tr> 9\/16\u2033<\/td> 9\/16-12<\/td> 9\/16-18<\/td><\/tr> 5\/8\u2033<\/td> 5\/8-11<\/td> 5\/8-18<\/td><\/tr> 3\/4\u2033<\/td> 3\/4-10<\/td> 3\/4-16<\/td><\/tr> 7\/8\u2033<\/td> 7\/8-9<\/td> 7\/8-14<\/td><\/tr> 1\u2033<\/td> 1-8<\/td> 1-14<\/td><\/tr> 1 1\/8\u2033<\/td> 1 1\/8-7<\/td> 1 1\/8-12<\/td><\/tr> 1 1\/4\u2033<\/td> 1 1\/4-7<\/td> 1 1\/4-12<\/td><\/tr> 1 3\/8\u2033<\/td> 1 3\/8-6<\/td> 1 3\/8-12<\/td><\/tr> 1 1\/2\u2033<\/td> 1 1\/2-6<\/td> 1 1\/2-12<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n