Heli-coil 2CSB Spiral Point Sti Tap 8-32 Unc

Product Description

The HELI-COIL 2CSB is a spiral point STI tap designed for cutting threads in pre-drilled holes that will accept Heli-Coil screw thread inserts. Sized at 8-32 UNC with a plug chamfer, this tap works in high-production and repair applications where thread restoration or creation to STI (Screw Thread Insert) standards is required. Ground from high-speed steel with a bright, uncoated finish, it features 2 flutes and an H2 thread limit for consistent tolerance control. Overall length is 2-3/8 inches with a 15/16-inch thread length. Machinists, maintenance technicians, and repair professionals use this tap when installing threaded inserts to restore stripped or damaged fastener holes.

The 2CSB is used in applications requiring STI UNC thread profiles at the 8-32 size - common in light-gauge metal, aluminum, and other materials where thread inserts reinforce weak or damaged fastener seats. Typical scenarios include aerospace maintenance, automotive repair, industrial equipment overhaul, and any field or shop situation where a standard 8-32 thread has been stripped and a Heli-Coil insert is the specified repair method. The plug chamfer style makes it well-suited for through-hole tapping in most standard repair depths.

Key Features

• STI UNC thread profile sized for 8-32 Heli-Coil screw thread inserts
• High-speed steel construction for durability across a range of workpiece materials
• Plug chamfer for versatile use in through-hole and moderately deep blind-hole applications
• H2 thread limit ensures consistent fit within 3B class of fit tolerance
• 2-flute spiral point geometry pushes chips forward, reducing recutting in through-hole operations
• Bright/uncoated finish suitable for use with standard cutting fluids

Compatibility

Designed for use with Heli-Coil screw thread insert systems requiring an 8-32 UNC STI tap. Intended for through-hole and suitable blind-hole applications where a 3B class of fit is specified.

Installation Notes

This tap should be installed by a qualified machinist or maintenance technician familiar with thread insert repair procedures. Always use the correct STI tap drill size for the insert being installed before tapping, and apply an appropriate cutting fluid for the workpiece material. Secure the workpiece firmly before tapping to maintain thread alignment. Follow the insert manufacturer's procedure for proper insert installation after tapping is complete.