Heli-coil 7552-2 Thread Insert Tool 8-36 Unf Prewinder

Product Description

The HELI-COIL 7552-2 is a hand-operated Type II prewinder installation tool designed for installing helical thread inserts in 8-36 UNF tapped holes. The prewinder design pre-winds the insert onto the mandrel before driving it into the host material, reducing cross-threading and installation errors. With a prewinder body diameter of 0.375 inches and a total prewinder length of 4.625 inches, this tool is sized for controlled, repeatable insert installation in production and field repair environments. It is used by machinists, maintenance technicians, and aerospace or industrial assembly personnel who require accurate thread restoration or reinforcement.

This tool is suited for both free-running and locking thread insert types in 8-36 UNF thread applications. It is appropriate for light-duty hand installation where a powered tool is not required or practical, making it a standard choice for low-volume insert installation, field repair work, and bench-top assembly operations. The compact form factor fits comfortably in a standard tool kit.

Key Features

• Type II prewinder design pre-winds insert onto mandrel before installation, reducing cross-threading risk
• Compatible with both free-running and locking helical thread inserts
• Minimum thread size 8-36 UNF for precision small-thread applications
• Prewinder body diameter of 0.375 inches and spinner diameter of approximately 2.28 inches for positive grip
• Prewinder length of 4.625 inches provides reach and control during installation
• Hand-operated tool - no power source required

Compatibility

Designed for use with free-running and locking helical thread inserts in 8-36 UNF thread size, conforming to the UNF thread standard.

Installation Notes

Installation is performed by hand - no pneumatic or electric drive is needed. Before installing thread inserts, ensure the tapped hole is clean, free of debris, and drilled and tapped to the correct insert tap size per the insert manufacturer specifications. Use appropriate safety glasses during installation. This tool is intended for use by qualified machinists or technicians familiar with thread insert installation procedures.