Explore: Screw Threads

default handedness for screw threads. Therefore, most threaded parts and fasteners have right-handed threads. Left-handed thread applications include:

ISO general-purpose metric screw threads ("M" series threads) are defined in international standard ISO 68-1. Each thread is characterized by its major

A screw is an externally helical threaded fastener capable of being tightened or released by a twisting force (torque) to the head. The most common uses

The small Edison screw has nine threads per inch, or a pitch of 1⁄9 in or 2.8222 mm per thread. The medium Edison screw has seven threads per inch, or a

Unified Thread Standard (UTS) defines a standard thread form and series—along with allowances, tolerances, and designations—for screw threads commonly

multiple-start threads, left-hand threads, and self-centering threads (which are less likely to bind under lateral forces). The original trapezoidal thread form

hole that mesh with the screw's threads. When the shaft of the screw is rotated relative to the stationary threads, the screw moves along its axis relative

British Standard Whitworth (BSW) is a screw thread standard that uses imperial (inch-based) units. It was devised and specified by British engineer Joseph

In manufacturing, threading is the process of creating a screw thread. More screw threads are produced each year than any other machine element. There

British Association screw threads, or BA screw threads, are a set of small screw threads, the largest being 0BA at 6 mm diameter. They were, and to some