Frequently Asked Questions

General Questions

What is the general rule for measuring bolts and set screws?

For almost all types of bolts and set screws, the rule is that you measure from the underside of the head to the end of the thread, as illustrated below;

How do I measure countersunk bolts and set screws?

For countersunk bolts and socket screws, you measure the total length of the screw including the head.

What is a coupling nut?

A coupling nut, also called an extension nut, is designed to join two male threads. Its hexagonal shape allows the nut to be tightened using a common open end wrench.

How to measure a coupling nut:

A coupling nut can be measured by its internal threads (X) as well as its measurement across its hexagonal flats (B) and profile height (A).

Have further questions?

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