Types of fastners

There are seven types of fasteners, each with their own unique use. A carriage bolt is also called a coach. The head of this fastener is countersunk, domed. It’s used to keep the bolt still while tightening a nut. A Hex head bolt is named for its hexagonal head. A machine screw’s point is flat and it works with washers and nuts. A shoulder bolt is a machine screw. A socket cap screw is one that is used with a socket wrench. Similar to this, a socket set grub screw lacks a head. A square head is one with four sides, resembling a square.

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