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2. ASTM A325 - Wikipedia

   en.wikipedia.org/wiki/ASTM_A325

   ASTM A325 is an ASTM International standard for heavy hex structural bolts, titled Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength. It defines mechanical properties for bolts that range from 1 ⁄ 2 to 1 + 1 ⁄ 2 inches (13 to 38 mm) in diameter. [1]

3. ASTM F568M - Wikipedia

   en.wikipedia.org/wiki/ASTM_F568M

   ASTM F568M is an ASTM International standard for metric bolts, screws and studs that are used in general engineering applications. It is titled: Standard Specification for Carbon and Alloy Steel Externally Threaded Metric Fasteners.

4. ASTM A354 - Wikipedia

   en.wikipedia.org/wiki/ASTM_A354

   ASTM A354 is an ASTM International standard that defines chemical and mechanical properties for alloy steel bolts, screws, studs, and other externally threaded fasteners.It is officially titled: Standard Specification for Quenched and Tempered Alloy Steel Bolts, Studs, and Other Externally Threaded Fasteners.

5. Unified Thread Standard - Wikipedia

   en.wikipedia.org/wiki/Unified_Thread_Standard

   The major diameter still extends to within ⁠ 1 / 8 ⁠ H of the theoretical sharp V, but the total depth of the thread is reduced 4% from ⁠ 5 / 8 ⁠ H = ⁠ 5 / 8 ⁠ cos(30°) P ≈ 0.541P to 0.52P. [5] This increases the amount of the theoretical sharp V which is cut off at the minor diameter by 10% from 0.25H to ⁠ 7 / 8 ⁠ − ⁠ 0. ...

6. Bolt (fastener) - Wikipedia

   en.wikipedia.org/wiki/Bolt_(fastener)

   A bolt is an externally helical threaded fastener capable of being tightened or released by a twisting force ... Steel fasteners (grade 2,5,8) - the level of strength;

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