Osg 1400115900 Thread Forming Tap 8-32 Unc Plug Cobalt

Product Description

The OSG 1400115900 is a thread forming tap designed for cold-forming internal threads without cutting, producing stronger threads by work-hardening the material rather than removing chips. Built from cobalt high-speed steel with a bright finish, this plug-style tap carries a H10 thread limit and is configured for right-hand threading at 8-32 UNC. It measures 2.125 inches in overall length with a shank diameter of 0.168 inches and a tapping depth of 0.752 inches. Part of the HY-PRO NRT series, it is suited for production and maintenance threading in a wide range of metalworking environments.

This tap is engineered for through-hole threading applications across multiple material groups. It handles alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum. The plug chamfer with 4 to 4.5 chamfered threads makes it appropriate for starting in a pre-drilled hole and continuing through the full depth. It is used in manufacturing, toolroom, and mechanical assembly settings where formed threads are preferred over cut threads for improved fatigue resistance.

Key Features

• Cobalt high-speed steel construction for improved heat and wear resistance in tough materials
• Thread forming (chipless) design produces stronger threads by cold-working the material
• H10 thread limit for precise tolerance control on 8-32 UNC threads
• Plug chamfer (4 to 4.5 threads) for easy starting in through-hole applications
• Right-hand thread direction, compatible with standard tapping equipment
• Bright finish with no coating for straightforward inspection and regrinding

Compatibility

Designed as an OEM-style replacement or direct tooling option for 8-32 UNC through-hole thread forming operations in alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum workpieces.

Installation Notes

Thread forming taps require a correctly sized forming tap drill — not a standard tap drill — to achieve the proper minor diameter before tapping. A machinist or toolroom technician should ensure the spindle speed and lubricant are appropriate for the workpiece material, as thread forming generates more torque than cutting taps. Do not reverse the tap under power without confirming the machine and holder support it. Secure the workpiece fully before beginning the tapping cycle.