Learn more about head markings and performance values. What is the difference between tension force and shear strength?

View technical details like Rockwell C, Proof Loads and Yield Strengths for common bolts.

Select the right drill bit size for your project.

View three values side-by side: Fractions, Decimals. Millimeters.

Determine Wrench size or for Hex Head Bolts and Hex Key size for Socket Heads.

Available in strong, stronger, strongest. Sizes are small, medium, and large.

View sizes for USS and SAE washers.

General guide showing Work Load Limits in Pounds.

Compare inch and metric performance values. This handy chart shows thread pitches, too.

View the different head types and tip choices. It includes performance values for each diameter.

Satisfy your curiousity about all the different finishes found on fasteners.

Identify all the different screws used for thinner metals.