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2. Trapezoidal thread form - Wikipedia

   en.wikipedia.org/wiki/Trapezoidal_thread_form

   The original trapezoidal thread form, and still probably the one most commonly encountered worldwide, with a 29° thread angle, is the Acme thread form (/ ˈ æ k m iː / AK-mee). The Acme thread was developed in 1894 as a profile well suited to power screws that has various advantages over the square thread , [ note 1 ] which had been the form ...

3. Threaded rod - Wikipedia

   en.wikipedia.org/wiki/Threaded_rod

   A threaded rod, also known as a stud, is a relatively long rod that is threaded on both ends; the thread may extend along the complete length of the rod. [1] They are designed to be used in tension. [2] Threaded rod in bar stock form is often called all-thread (ATR); other names include fully-threaded rod, redi-rod, continuously-threaded rod ...

4. Unified Thread Standard - Wikipedia

   en.wikipedia.org/wiki/Unified_Thread_Standard

   Even though #14 and #16 screws are still available, they are not as common as sizes #0 through #12. [citation needed] Sometimes "special" diameter and pitch combinations (UNS) are used, for example a 0.619 in (15.7 mm) major diameter with 20 threads per inch. UNS threads are rarely used for bolts, but rather on nuts, tapped holes, and threaded ODs.

5. Barrel threads - Wikipedia

   en.wikipedia.org/wiki/Barrel_threads

   Threaded barrels are often mounted to the receiver with a lot of torque, and will therefore generally require tools for assembly and disassembly, such as a suitable action wrench and a vise. Depending on the firearm, a recoil lug is sometimes fitted between the barrel and stock as part of the process,

6. List of thread standards - Wikipedia

   en.wikipedia.org/wiki/List_of_thread_standards

   Unified Inch Screw Threads (UNJ Thread Form) V Thread Form ASME B1.20.1-2013: Pipe Threads, General Purpose (Inch) Pipe Thread Form ANSI B1.20.3-1976 (R2013) Dryseal Pipe Threads (Inch) Pipe Thread Form ASME B1.20.7-1991 (R2013) Hose Coupling Screw Threads - Inch: Pipe Thread Form ASME B1.21M-1997 (R2013) Metric Screw Threads - MJ Profile: V ...

7. Nut (hardware) - Wikipedia

   en.wikipedia.org/wiki/Nut_(hardware)

   J-nut or U-nut, sheet metal nut, speed nut (ambiguously) Designed to be clipped to sheet metal Coupling nut: Extension nut A threaded fastener for joining two male threads, most commonly a threaded rod,[1][2] but also pipes Flange nut: Collar nut Has a wide flange at one end that acts as an integrated washer HARDLOCK Nut [3] Eccentric Double Nut