Top Lock Nuts

A top lock nut is a lock nut with irregular shaped threads at the top of the nut, gripping the bolt for a stronger hold than a standard nylon-insert lock nut. They thread on from the bottom of the nut allowing more threads to engage the bolt before tightening for easier installation than a center lock nut. The strength of the bolt should match the strength of the nut to prevent damaging threads. Top lock nuts can be reusable depending on the application. Available and ready-to-ship in a variety of sizes, finishes coatings. Browse our selection of top lock nuts for your building projects and industrial applications.

Here at BW Industrial Sales, your satisfaction is our number one priority! If you have any questions about top lock nuts or any other manufacturing parts and tooling, please contact our experienced and qualified BW Industrial Sales staff; or call us at 626-358-1836 for an immediate response.

Grade-9:  A top lock nut designed specifically to be used with bolts with a minimum tensile strength equal to or less than 180,000 psi. Made of medium carbon or alloy steel.

Grade-B: A top lock nut designed for use with low or medium carbon steel screws. Made of low carbon steel.

Grade-C: Similar to a Grade B but smaller across the flats. These can withstand vibration and shock loads and are frequently used in farm machinery, and automotive metalworking industries. Made of C10022 – 1045 steel.

Grade-G: A top lock nut with a flange on the bottom side of the nut. This style reduces inventory by eliminating a washer and is designed to be used with a grade-8 frame bolt.
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