Thread standards

hardware threading standard

technical standard for screw thread design

standard set of screw thread sizes used in pipe fittings

Trapezoidal thread forms

standard for screw threads in North America, whose characteristic dimensions are based on inch fractions

U.S. national technical standards for threads on pipes and pipe fittings, including both tapered and straight thread series for various purposes

Asymmetric thread profile which allows for low friction and the ability to handle greater loads in one direction, at the cost of higher friction and inferior load bearing in the opposite direction