Heli-coil 10193-12 Hand Sti Tap 3/4-16 Unf H3 Bottoming

Product Description

The HELI-COIL 10193-12 is a hand STI tap designed for threading holes to accept Heli-Coil wire thread inserts in a 3/4-16 UNF specification. Built from high speed steel with a bright finish, this tap features an H3 thread limit and a bottoming chamfer for threading close to the bottom of a blind hole. It carries 4 flutes and a thread length of 2 inches with an overall length of 4-15/32 inches. Machinists, tool and die technicians, and maintenance mechanics use this tap when restoring or creating threaded holes that require insert reinforcement in metal components.

This tap is suited for repair and fabrication work in manufacturing, maintenance, and overhaul environments where damaged or worn threads need to be restored using wire thread inserts. The bottoming chamfer makes it practical for blind-hole applications where full thread engagement near the base of the hole is required. It is used with a standard tap wrench and follows manual hand-tapping procedures for controlled thread cutting in steel, aluminum, and similar materials.

Key Features

• 3/4-16 UNF thread size for fine-thread insert applications
• H3 thread limit for consistent fit with Class 3B tolerance
• Bottoming chamfer allows threading close to the base of blind holes
• 4 flutes provide efficient chip clearance during hand tapping
• High speed steel construction for durability across ferrous and non-ferrous materials
• Bright finish with overall length of 4-15/32 inches for standard tap wrench use

Compatibility

Designed for use in hand-tapping operations that prepare holes to receive Heli-Coil wire thread inserts in the 3/4-16 UNF thread form.

Installation Notes

Installation is performed by a machinist or maintenance technician using a standard tap wrench. Secure the workpiece before tapping and apply cutting fluid appropriate for the base material. Back the tap off periodically to break chips and prevent tap breakage. Always follow shop safety procedures and wear appropriate eye protection when hand tapping.