Jergens 215-066522 Thread Locking Insert Unf Stainless Steel

Product Description

The JERGENS 215-066522 is a thin wall keylocking thread locking insert designed to install a permanent, load-bearing internal thread into a parent material. It accepts a 1/4-28 UNF internal thread and uses a 3/8-16 UNF external thread to anchor into the host part. Overall length is 0.37 inches. Constructed from 303 stainless steel with a passivated finish, this insert resists corrosion and meets NAS 1394 standards. Machinists, aerospace assemblers, and precision fabricators use keylocking inserts to create secure thread repairs or original installations in metal assemblies where thread pullout resistance is critical.

This insert is suited for applications requiring a reliable thin wall thread reinforcement in close-tolerance bores. The thin wall profile allows installation where bore spacing is tight and a standard-diameter insert would not fit. It is commonly used in aerospace, defense, and industrial equipment manufacturing. The 303 stainless steel construction makes it appropriate for environments requiring corrosion resistance without additional coating beyond passivation.

Key Features

• 1/4-28 UNF internal thread with Class 2B fit for precise engagement
• 3/8-16 UNF external thread with Class 2A fit anchors insert into parent material
• Thin wall keylocking design enables installation in tight bore spacing
• 303 stainless steel construction with passivated finish for corrosion resistance
• Meets NAS 1394 standard
• 0.37 inch overall length for compact thread reinforcement

Compatibility

Designed as an OEM-style thread reinforcement insert for metal assemblies requiring a 1/4-28 UNF internal thread installed via a 3/8-16 UNF external thread interface, conforming to NAS 1394.

Installation Notes

Installation is performed by machinists or precision assemblers using a keylocking insert driver tool after the parent material has been tapped to the correct 3/8-16 UNF specification. Keys are driven flush with the parent material surface after the insert is seated to lock it against rotation. Ensure the parent bore is clean and dimensionally correct before installation. Follow the fastener manufacturer and applicable engineering specifications for hole preparation and key driving procedure.