Osg 1805600 Sti Hand Tap 10-24 Unc H2 3 Flute

Product Description

The OSG 1805600 is a hand STI tap designed for cutting Screw Thread Insert (STI) threads in a range of metals. It features a 10-24 UNC thread profile with an H2 thread limit, 3 flutes, and a plug chamfer for standard through-hole and blind-hole tapping applications. Constructed from high-speed steel with a bright uncoated finish, it delivers consistent thread formation in aluminum, carbon steel, cast iron, and hardened steel. The plug chamfer provides gradual cutting entry, reducing the load on the tap during hand or machine-assisted operation. Licensed machinists, maintenance technicians, and field service pros use this tap to prepare holes for Heli-Coil or similar STI inserts.

This tap is suited for light industrial, maintenance, repair, and overhaul work where stripped or damaged threads need to be restored using threaded inserts. The 10-24 UNC size is common in sheet metal assemblies, equipment enclosures, and mechanical fastening applications across HVAC, electrical, and general manufacturing environments. With a 0.875-inch thread length and an overall length of 2.375 inches, it fits standard tap handles designed for small-diameter taps. Its compact dimensions make it practical in confined workspaces during equipment repair.

Key Features

• 10-24 UNC thread profile with H2 thread limit for consistent fit with standard STI inserts
• 3-flute plug chamfer geometry for gradual thread engagement and reduced tap breakage risk
• High-speed steel construction handles aluminum, carbon steel, cast iron, and hardened steel
• Bright uncoated finish suits general-purpose tapping without lubrication-sensitive coatings
• 0.875-inch thread length and 2.375-inch overall length sized for standard small-tap handles
• OSG Series 126 design for reliable dimensional consistency across the product line

Compatibility

Designed for use with standard 10-24 UNC STI insert systems in aluminum, carbon steel, cast iron, and hardened steel workpieces. Fits tap handles accepting a 0.1520-inch square drive and a 0.1940-inch shank diameter.

Installation Notes

Always drill the correct STI oversize pilot hole before tapping - the required drill size differs from a standard 10-24 tap drill and must match the insert manufacturer specification. Secure the workpiece and use a calibrated tap handle to maintain axial alignment and prevent tap breakage. Apply cutting fluid appropriate for the workpiece material, particularly when tapping steel or cast iron. Follow the insert manufacturer installation instructions after tapping is complete to seat the insert correctly.