Osg 1400142800 Thread Forming Tap 1/2-13 Unc Cobalt

Product Description

The OSG 1400142800 is a cobalt thread forming tap in the HY-PRO NRT series, designed for cold-forming internal threads without cutting or producing chips. It carries a 1/2-13 UNC thread specification with a modified bottoming chamfer of 2 to 2.5 threads, making it suited for threading close to the bottom of blind holes. The tap runs right-hand thread direction, carries a Class 3B fit, and is finished to an H5 thread limit. Overall length is 3.375 inches with a shank diameter of 0.367 inches. Licensed machinists and tool and die professionals install this tap in production and job-shop environments where chip-free threading is required.

This tap is built for blind hole threading applications across a broad range of ferrous and non-ferrous metals. Compatible material applications include alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel. It is well suited for CNC tapping centers and manual machines where controlled torque and rigid toolholding are available. The bright finish and cobalt construction support performance in tough-to-machine materials that would accelerate wear in standard HSS taps.

Key Features

• Thread forming design produces no chips, reducing clearing time in blind hole operations
• Cobalt construction provides elevated heat resistance for harder alloys and stainless steel
• Modified bottoming chamfer (2 to 2.5 threads) allows threading close to hole bottom
• H5 thread limit and Class 3B fit ensure consistent, tight-tolerance thread production
• Right-hand thread direction compatible with standard CNC and manual tapping setups
• Bright finish suitable for use with standard tapping fluids and cutting oils

Compatibility

Designed for blind hole threading in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces requiring 1/2-13 UNC Class 3B internal threads.

Installation Notes

Installation should be performed by a qualified machinist following proper speeds and feeds for thread forming taps, which typically require higher torque than cutting taps of the same size. Use an appropriate tapping fluid or cutting oil for the workpiece material. Ensure the tap holder provides rigid, concentric alignment to avoid tap breakage, especially near hole bottom. Never reverse the tap abruptly at depth in blind hole applications.