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Unified Thread Standard. The Unified Thread Standard ( UTS) defines a standard thread form and series—along with allowances, tolerances, and designations—for screw threads commonly used in the United States and Canada. It is the main standard for bolts, nuts, and a wide variety of other threaded fasteners used in these countries.
British Standard Whitworth. British Standard Whitworth ( BSW) is an imperial-unit -based screw thread standard, devised and specified by Joseph Whitworth in 1841 and later adopted as a British Standard. It was the world's first national screw thread standard, and is the basis for many other standards, such as BSF, BSP, BSCon, and BSCopper .
1⁄4 ″-20 BSW. ISO 68-1:1998. ISO general purpose screw threads—Basic profile—Part 1: Metric screw threads. V Thread Form. ISO 68-2:1998. ISO general-purpose screw threads—Basic profile—Part 2: Inch screw threads. V Thread Form. ISO 261:1998. ISO general purpose metric screw threads —General plan.
United States Standard thread. United States Standard thread ( USS thread ), also known as Sellers Standard thread, [ 1] Franklin Institute thread[ 1] and American Standard thread, [ 2] is a standard for inch based threaded fasteners and washers. [ 3] The USS standard is no longer supported. It, together with the SAE fastener standard, was ...
Square thread form. The square thread form is a common screw thread profile, used in high load applications such as leadscrews and jackscrews. It gets its name from the square cross-section of the thread. [ 1] It is the lowest friction and most efficient thread form, but it is difficult to fabricate.
The major diameter is given by 6p 1.2, [4]: 12 rounded to two significant figures in mm and the hex head size (across the flats) is 1.75 times the major diameter. BA sizes are specified by the following British Standards: BS 57:1951 — B.A. screws, bolts and nuts
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 ⁄ to 1⁄ inches (13 to 38 mm) in diameter. [ 1]
ISO 898. ISO 898 is an international standard that defines mechanical and physical properties for metric fasteners. This standard is the origin for other standards that define properties for similar metric fasteners, such as SAE J1199 and ASTM F568M. [ 1] It is divided into five (nonconsecutive) parts:
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