Bolt & Nut

#Bolt and #nut are a type of fastener typically made of metal, and characterized by a helical ridge known as a thread

bolt and nut
bolt and nut

Nut is a metal piece with a threaded hole that can mesh with bolt
Bolt diameter is designed as the needed duty on #tensile and #shear and threads are designed on shear and #stress then knowing needed threads to handle the weight

Bolt design
Bolt design

Bolt’s head is made with many shapes to be catched with wrenches .. and the nut typically has the same shape .

A book in bolts design

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