Screw-Lock Inserts | McMaster-Carr

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Helical Insert Type

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For Use In

Internal Locking Type

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Metric Class 4H5H

Metric Class 4H6H

Unified Standard Class 2B

Unified Standard Class 3B

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615 Products

How to Install Helical Inserts

About Helical Insert Length

Stainless Steel Screw-Locking Helical Inserts

A distorted thread grips the screw to resist loosening.

Lubricated Stainless Steel
Screw-Locking Helical Inserts

A dry film keeps the screw from sticking or binding in these inserts during installation.

Stainless Steel Screw-Locking Helical
Inserts for Particle-Free Environments

Made of Nitronic 60 stainless steel, these inserts prevent the screw from binding or sticking without any coating or lubricant that could contaminate particle-free environments.

Screw-Locking Helical Inserts without Prong

A distorted thread grips the screw to resist loosening.

Screw-Locking Key-Locking Inserts

Forming the strongest hold of any of our threaded inserts, these inserts have a distorted internal thread to lock screws into place and keys that drive into surrounding material to prevent slipping and rotating.

Screw-Locking Easy-to-Install
Thread-Locking Inserts

Adhesive on both the internal and external threads keeps these inserts in place and holds screws tight.

Screw-Locking Tee Nut Inserts for Wood

Use where vibration is a concern—these tee nut inserts have distorted threads that lock screws in place.