Jergens 215-065922 Keylocking Thread Insert 1/4-20 Unc

Product Description

The JERGENS 215-065922 is a thin wall keylocking thread locking insert designed to create a permanent, vibration-resistant internal thread in metal assemblies. Machined from C1215 carbon steel with a zinc phosphate coating, this insert features a 1/4-20 internal thread and a 3/8-16 external thread, both to UNC standards. Overall length is 0.37 inches, making it well suited for shallow boss applications and tight-clearance installations. It meets NAS 1394 standards and carries internal thread class of fit 2B and external thread class of fit 2A. Keylocking inserts are installed by machinists and assembly technicians wherever reliable thread retention is required in production or MRO environments.

This insert is used in applications where a conventional threaded hole must be reinforced or repaired to accept a 1/4-20 fastener. The thin wall design minimizes the amount of parent material required around the bore, making it practical for castings, housings, and structural components with limited wall thickness. It is appropriate for both original equipment manufacturing and field repair scenarios across industrial, aerospace-adjacent, and general mechanical assembly applications.

Key Features

• 1/4-20 internal thread (Class 2B) accepts standard UNC fasteners
• 3/8-16 external thread (Class 2A) for installation into prepared host bore
• Thin wall keylocking design minimizes required boss diameter
• C1215 carbon steel construction with zinc phosphate coating for corrosion resistance
• Meets NAS 1394 standard for keylocking threaded inserts
• 0.37-inch overall length suits shallow-depth thread applications

Compatibility

Designed as an OEM-style keylocking thread insert for use in metal parent materials requiring a 3/8-16 tapped host bore to accept a 1/4-20 internal thread. Consult NAS 1394 installation specifications for host material and bore preparation requirements.

Installation Notes

Installation is performed by qualified machinists or assembly technicians using a keylocking insert installation tool appropriate for the 3/8-16 external thread size. The host bore must be tapped to 3/8-16 UNC before insert installation. Keys are driven into the parent material after the insert is threaded in place to lock it against rotation. Inspect the host material for adequate wall thickness before installing the thin wall variant.