Nuts and Bolts

Please use this page as a reference on how to identify your preferred items.


Bolt Identification


Measured across the threaded area.

Imperial fasteners are measured in inches. Metric fasteners are measures in millimeters.

Thread pitch (English system)

The number of threads per inch.

Thread pitch (Metric system)

The distance in millimeters between two adjacent threads.

Where to measure bolt length, shank length and thread length.

Imperial Size Bolt

Bolt Identification Examples

Imperial Size Bolt Identification Example

Metric Size Bolt Identification Example

Bolt Diagram

Bolt Grade Markings

Bolt Grade Marks


Many different types of washers are used with fasteners.

The type of washer defines the purpose of the washer.

Thread Lubricants and Sealants