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3.5 inch screw

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Product Summary

3.5 inch screw is a screw whose size is 3.5 inch. It is The ISO metric screw threads, which are the world-wide most commonly used type of general-purpose screw thread. They were one of the first international standards agreed when the International Organization for Standardization was set up in 1947. The design principles of ISO general-purpose metric screw threads (M series threads) are defined in international standard ISO 68-1. Each thread is characterized by its major diameter D and its pitch P. ISO metric threads consist of a symmetric V-shaped thread. In the plane of the thread axis, the flanks of the V have an angle of 60° to each other. The outermost 1/8 and the innermost 1/4 of the height H of the V-shape are cut off from the profile.

The relationship between the height H and the pitch P is found using the equation. In an external (male) thread (e.g., on a bolt), the major diameter Dmaj and the minor diameter Dmin define maximum dimensions of the thread. This means that the external thread must end flat at Dmaj, but can be rounded out below the minor diameter Dmin. Conversely, in an internal (female) thread (e.g., in a nut), the major and minor diameter are minimum dimensions, therefore the thread profile must end flat at Dmin but may be rounded out beyond Dmaj. The minor diameter Dmin and effective pitch diameter Dp are derived from the major diameter and pitch.

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