Osg 1400101505 Thread Forming Tap 1-72 Unf Bottoming Cobalt Tin

Product Description

The OSG 1400101505 is a thread forming tap designed for cutting 1-72 UNF internal threads in blind holes. Part of the HY-PRO NRT series, it is constructed from cobalt high-speed steel and finished with a titanium nitride (TiN) coating for extended tool life in demanding applications. The bottoming chamfer — 1 to 1.5 threads — allows threading close to the bottom of a blind hole. Overall length is 1.688 inches with a thread length of 0.374 inches. This tap is suited for machine shops, maintenance operations, and precision assembly work where fine unified threads are required in small-diameter fastener applications.

This tap is appropriate for use on alloy steel, carbon steel, die steel, hardened steel, aluminum, and stainless steel workpieces. The right-hand thread direction and Class 2B fit make it a standard choice for general-purpose blind hole threading in both production and repair environments. The H3 thread limit provides consistent sizing control across these material types. It is typically run in CNC machining centers, drill presses, and tapping machines where controlled feed and speed can be maintained.

Key Features

• Bottoming chamfer (1 to 1.5 threads) for threading close to the base of blind holes
• Cobalt construction provides heat and wear resistance in tough alloys and stainless steel
• TiN coating reduces friction and extends tap life across a broad range of workpiece materials
• H3 thread limit ensures Class 2B fit consistency
• Right-hand thread direction, compatible with standard tapping equipment
• No coolant-through requirement — suitable for conventional flood or mist coolant setups

Compatibility

Designed for blind hole threading of 1-72 UNF threads in alloy steel, carbon steel, die steel, hardened steel, aluminum, and stainless steel. Material application codes P and N confirm suitability across these material groups.

Installation Notes

Installation and use should be performed by a qualified machinist or tool and die technician. Always secure the workpiece and verify spindle alignment before tapping to prevent tap breakage in small-diameter applications. Use an appropriate cutting fluid or tapping compound for the workpiece material, and ensure the tapping machine or CNC program maintains correct feed rate relative to thread pitch. Do not reverse the tap under power until the cut is complete to avoid thread damage.