Osg 1400144700 Thread Forming Tap 1/2-20 Unf Cobalt

Product Description

The OSG 1400144700 is a thread forming tap in the HY-PRO NRT series, designed for cold-forming internal threads without cutting chips. It produces a 1/2-20 UNF right-hand thread using a modified bottoming chamfer with 2 to 2.5 chamfered threads, allowing it to thread close to the bottom of a blind hole. Made from cobalt high-speed steel with a bright finish, this tap carries a Thread Limit of H6 and measures 3.375 inches in overall length. Licensed machinists and tool and die professionals use this tap in production and maintenance threading operations where chip-free thread forming is preferred.

This tap is suited for blind hole threading in a range of metallic workpiece materials, including alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel. The modified bottoming chamfer makes it a practical choice when thread depth must be maximized in a stopped bore. With a tapping depth of 1.933 inches and a thread length of 0.9213 inches, it delivers consistent thread form in both manual and machine tapping setups across production and job shop environments.

Key Features

• Thread forms 1/2-20 UNF right-hand threads via cold-forming, eliminating chips in the bore
• Modified bottoming chamfer with 2 to 2.5 chamfered threads for threading close to blind hole bottoms
• Cobalt high-speed steel construction for heat and wear resistance in tough alloys and hardened steel
• H6 thread limit for close-tolerance thread production
• Bright finish suitable for use with cutting fluids and standard tapping lubricants
• Compatible with alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel

Compatibility

Designed for blind hole threading applications in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces. Suitable for use in manual tapping handles and CNC or turret tapping machines configured for thread forming operations.

Installation Notes

Thread forming taps are installed by machinists and tool and die technicians using rigid or floating tap holders on machine tools or manual tapping equipment. Always apply an appropriate tapping fluid or cutting oil matched to the workpiece material before starting. Ensure the tap is properly aligned with the drilled pilot hole to avoid tap breakage or thread distortion. Power down all machine tools and secure the workpiece before changing or setting taps.