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US Fastener Sources
US Fastener Sources
US Fastener Sources

Fastener Reference Guides

Bolt Torque Charts
There are many variables in the torque-tension relationship. Therefore, these suggested torque calculations are estimates and offered as a guide only.

Thread Pitch Chart
Thread pitch is the distance between threads expressed in mm. Here you will find pitch/diameter combinations for UNC, UNF and 8UN Thread Series.

Screw Point Types
An illustrated guide to Sheet Metal Tapping Screws (Type A, AB & B), Thread Cutting Screws (Type 1, 17, 23, 25 & F), and Thread Forming Screws (Type C, CA, PT Trilobular & Hi-Lo).

Fastener Thread Terminology
A handy reference guide defining various fastener thread terms and classes of thread.

Drive & Head Styles
A guide to help distinguish between different types of drive styles and head styles.

Material Specifications
Provides a general overview of the common material specs.

Nut Compatibility
Provides a general overview of the nuts suitable for certain grades of bolts.

Bolt Grade Markings & Strength Chart
Helps to identify grades of bolts along with proving proof load, tensile strength, yield strength and hardness.

Threads Per Inch Chart
Provides threads per inch on standard inch coarse and fine thread fasteners.

Metric Thread Pitch Chart
Provides thread pitch for metric fasteners including coarse and fine threads.

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