Osg 6006100 Hand Sti Tap 5-40 Unc H2 Bottoming Chamfer

Product Description

The OSG 6006100 is a hand STI tap designed to cut Screw Thread Insert (STI) threads in 5-40 UNC applications. It features a bottoming chamfer for threading holes that require full threads close to the bottom, and three flutes to evacuate chips efficiently during the tapping operation. Manufactured from high-speed steel with a bright uncoated finish, this tap holds an H2 thread limit for consistent tolerance control. It carries an overall length of 1.9375 inches and a thread length of 0.625 inches. Machinists and maintenance technicians use it when installing threaded inserts to restore or strengthen stripped or worn threads in metal components.

This tap is suited for use in a shop or field repair environment where STI threads must be cut prior to installing helical threaded inserts such as wire-type thread repair inserts. It is appropriate for manual hand-tapping operations in materials including aluminum, carbon steel, cast iron, and hardened steel. The 5-40 UNC thread size makes it a common selection for small fastener and instrument applications where thread restoration or reinforcement is required.

Key Features

• Bottoming chamfer allows threading to the base of blind holes
• Three flutes provide chip clearance and cutting efficiency in hand tapping
• H2 thread limit delivers consistent, controlled thread tolerance
• High-speed steel construction handles a range of ferrous and non-ferrous metals
• Bright uncoated finish suitable for general-purpose tapping without added coating cost
• STI thread profile designed specifically for thread insert installation

Compatibility

Designed for use in 5-40 UNC STI thread insert applications in aluminum, carbon steel, cast iron, and hardened steel. This tap cuts the oversized STI thread that accepts standard helical thread repair inserts in 5-40 UNC fastener sizes.

Installation Notes

This tap is intended for hand tapping and should be used with a proper tap wrench sized for the square drive. Ensure the workpiece is securely fixtured and the hole is drilled to the correct STI tap drill diameter before starting. Apply cutting fluid appropriate for the workpiece material to reduce friction and extend tool life. Reverse the tap periodically to break and clear chips, particularly in deeper holes or when working in cast iron or hardened steel.