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Bolts are a type of fastener. Fasteners are used to secure or fasten materials together. There are many types of bolts and hardware nuts. Most, if not all, bolt types have machine threads. A threaded bolt screws into nuts to hold or fasten materials together. Bolt types include eye bolts, wheel bolts and machine bolts while types of nuts include cap nuts, expansion nuts and u-nuts. This guide will tell you about the types of nuts and bolts and the different types of bolt heads.
Bolts and nuts can be made of various materials such as steel, titanium, or plastic. The finish or plating on a metal bolt or nut affects its look and durability. Below are some common finishes and benefits:

Zinc – Most common, low cost, resists corrosion and rust
Nickel – Very hard finish, higher investment, good corrosion resistance
Chromium ¨C Bright finish, good rust, and corrosion resistance
Chromate ¨C Adds color, shine, superior rust resistance
Anodizing – Aluminum, hard oxide surface, excellent corrosion resistance

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