Osg 1626001108 Thread Forming Sti Tap 8-32 Unc H2

Product Description

The OSG 1626001108 is a thread forming STI tap designed for cutting 8-32 UNC internal threads in a wide range of materials. Unlike cutting taps, this forming tap displaces material rather than removing chips, producing stronger threads with a smoother finish. It is built from high-speed steel and carries a V (oxide) finish. The semi-bottoming chamfer allows threading close to the bottom of blind holes. Overall length is 3.1496 inches, with a shank diameter of 0.22 inches and a thread length of 15/16 inches. The square drive size measures 0.165 inches. This tap is suited for use in CNC machining centers and manual tapping operations in production and maintenance environments.

This tap is intended for use on a broad range of workpiece materials including carbon steel, alloy steel, stainless steel, aluminum, nickel, hardened steel, and titanium alloy. The H2 thread limit designation ensures the finished thread falls within a controlled tolerance range appropriate for 3B class of fit applications. It is well suited for production tapping where thread quality and consistency are critical, and for repair or rework operations requiring STI thread inserts.

Key Features

• Thread forming (chipless) design produces stronger threads by cold-forming rather than cutting
• 8-32 UNC thread size with H2 thread limit for 3B class of fit tolerance control
• Semi-bottoming chamfer allows threading close to the bottom of blind holes
• High-speed steel construction for durability across a wide range of workpiece materials
• V (oxide) finish provides mild corrosion resistance and lubricity during tapping operations
• Compatible with carbon steel, alloy steel, stainless steel, aluminum, nickel, hardened steel, and titanium alloy

Compatibility

Designed for tapping STI (Screw Thread Insert) 8-32 UNC holes in carbon steel, alloy steel, stainless steel, aluminum, nickel, hardened steel, and titanium alloy workpieces. Suitable for use with standard tapping chucks and holders accepting a 0.22-inch shank diameter.

Installation Notes

This tap should be installed and operated by a qualified machinist or tooling professional familiar with tapping procedures and speeds for the target workpiece material. Always apply appropriate tapping fluid or cutting oil for the material being tapped, and ensure the tap is properly aligned with the pre-drilled hole before engagement. Use the correct STI tap drill size for the 8-32 UNC thread form prior to tapping. Inspect the tap for wear or damage before each use to avoid thread quality issues or tap breakage.