Heli-coil A1185-02EN172 Free Running Insert 2-56 Unc

Product Description

The HELI-COIL A1185-02EN172 is a free running wire thread insert designed to create strong, wear-resistant internal threads in materials that are too soft, brittle, or prone to thread stripping. The insert is formed from stainless steel wire coiled to match a 2-56 UNC thread profile and measures 0.172 inches overall length, representing a 2D length-to-diameter ratio. It features a tang for installation with a standard Heli-Coil driver tool. With 7-3/8 free coils, the insert distributes thread load across multiple contact points, extending the service life of the parent material. Machinists, maintenance technicians, and assembly professionals install these inserts in production and repair applications.

This insert is suited for threaded repair and original assembly work where a 2-56 UNC internal thread is required. Common applications include precision instrument assemblies, electronics enclosures, aerospace components, and any light-alloy or plastic housing where thread integrity must be maintained under repeated fastener engagement. The tanged design is compatible with standard installation tooling for driven insertion. Single insert per package with a minimum order quantity of 5 units.

Key Features

• 2-56 UNC thread size for use in fine-pitch fastener applications
• 0.172 inches overall length with a 2D length-to-diameter ratio for compact thread reinforcement
• Stainless steel construction resists corrosion and provides durable thread surfaces
• Tanged design enables precise installation with standard Heli-Coil insertion tools
• 7-3/8 free coils distribute load across the full insert length

Compatibility

Designed as an OEM-style thread insert replacement for any application requiring a 2-56 UNC free running insert with a 0.172 inch overall length and standard 2D engagement depth.

Installation Notes

Installation is performed by machinists or maintenance technicians using a Heli-Coil tap to prepare the parent hole to the correct oversize diameter before driving the insert. Power down or de-energize any equipment fully before performing thread repair on installed assemblies. After the insert is seated flush or below the surface, the tang is broken off using a tang break-off tool. Follow the insert manufacturer's installation guide for correct tap drill size selection based on parent material.