Flexloc Nuts

Flexloc® All Metal Lock Nuts are a one-piece, hex-shaped lock nut with a round, segmented collar at its back end. The segmented collar is comprised of opposed slots cut into it above each corner of the nut. Flexloc® nuts are frequently used in high-stress or high-temperature environments such as aerospace or automotive applications. 

Frequently Asked Questions About Flexloc® Nuts

What is the difference between a Flexloc® nut and a nylon insert lock nut? 

The main difference is the material composition and design. Nylon insert lock nuts use a polymer collar at the top of the nut to create a friction grip against the bolt threads, whereas a Flexloc® nut is an entirely metal fastener with a segmented collar that acts as the locking mechanism. 

How does a Flexloc® nut prevent loosening?

When the screw or bolt reached the segmented collar part of the nut, the slotted portion expands, which creates the prevailing torque locking action. 

What are the different types of Flexloc® nuts?

Flexloc® Nuts are available in light hex full height, light hex thin height, and heavy hex full height. The light hex style has a lesser across the flats dimension, resulting in a lighter-weight nut with the same strength as the heavy hex style. The light hex, thin height style is around 30% shorter than the full height nut. The heavy hex, full height style has the greatest locking capacity and largest wrenching area of all Flexloc® nuts. 

What sizes do Flexloc® nuts come in?

AFT offers Flexloc® nuts in diameter-thread sizes ranging from #10-24 to 9/16”-18. 

What materials and finishes are Flexloc® nuts available in?

Flexloc® nuts are made of 18-8 stainless steel and come in a plain finish.