Osg 1405005508 Thread Forming Tap 10-24 Unc Modified Bottoming

Product Description

The OSG 1405005508 is a thread forming tap designed for cold-forming internal threads in ductile metals without cutting or producing chips. It uses a modified bottoming chamfer with 2 to 2.5 chamfered threads, allowing it to thread close to the bottom of a blind hole. Built from powdered metal high-speed steel (PM-HSS), the tap carries a TiCN coating for improved surface hardness and lubricity. At 2.375 inches overall length with a thread length of 0.4921 inches and a shank diameter of 0.194 inches, it is sized for machine tapping operations requiring a 10-24 UNC, Class 2B fit at an H6 thread limit. This tap is installed by machinists, toolroom technicians, and maintenance mechanics working with CNC machines or manual tapping equipment.

This tap is suited for blind hole threading in a wide range of ductile materials including alloy steel, aluminum, carbon steel, die steel, stainless steel, and hardened steel. The modified bottoming chamfer makes it particularly useful in applications where thread depth must be maximized in a shallow blind hole. It is used in production machining, toolroom fabrication, and maintenance repair operations where chip-free threading is required to avoid contamination in enclosed or precision assemblies.

Key Features

• Thread forming design produces no chips, eliminating chip-related blind hole contamination
• Modified bottoming chamfer with 2 to 2.5 chamfered threads for threading close to hole bottom
• Powdered metal high-speed steel construction for toughness and wear resistance
• TiCN coating reduces friction and extends tool life in abrasive and stainless applications
• H6 thread limit and Class 2B fit for standard precision threading requirements
• Right-hand thread direction, compatible with standard tapping attachments and CNC rigid tapping cycles

Compatibility

Designed for blind hole threading in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces. Material application codes P, M, and N confirm suitability across ferrous, stainless, and nonferrous ductile metals. Part of the OSG EXOTAP VP-NRT Series 14050.

Installation Notes

Install in a rigid tapping chuck or floating tap holder sized for a 0.194-inch shank diameter. Power down or lock out the machine spindle before loading or removing the tap. Use a thread forming lubricant appropriate for the workpiece material, particularly when tapping stainless steel or hardened steel. Verify pilot hole diameter against the recommended forming tap drill chart for 10-24 UNC before operation, as thread forming taps require a larger pilot hole than cutting taps.