Osg 1400134700 Thread Forming Tap 3/8-16 Unc Bottoming

Product Description

The OSG 1400134700 is a thread forming tap in the HY-PRO NRT series, designed for cold-forming internal threads without cutting or producing chips. Sized at 3/8-16 UNC with a bottoming chamfer of 1 to 1.5 threads, it is suited for threading blind holes where maximum thread depth is required. Constructed from cobalt with a bright finish, the tap carries a Thread Limit of H7 and handles right-hand thread direction. It is installed by machinists and tool-and-die professionals in production and maintenance environments requiring precise, chip-free threading.

This tap is rated for use in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel. Its application is blind hole threading, making it a practical choice for close-tolerance work in both job shop and production floor settings. The bottoming chamfer allows threading close to the bottom of a blind hole, maximizing usable thread length in components where through-hole design is not an option.

Key Features

• Thread forming design cold-forms threads without cutting chips, reducing tap breakage risk in blind holes
• Bottoming chamfer with 1 to 1.5 chamfered threads for maximum thread depth in blind hole applications
• Cobalt construction provides heat and wear resistance in ferrous and hardened materials
• H7 thread limit for consistent, close-tolerance thread form
• Right-hand thread direction, 3/8-16 UNC
• No coolant-through design; suitable for use with surface-applied cutting fluid

Compatibility

Rated for use in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces with material application codes P and N. Designed for blind hole threading in components requiring 3/8-16 UNC right-hand internal threads.

Installation Notes

Thread forming taps require a properly sized forming tap drill hole, which is larger than a standard cut-tap drill size — consult the OSG HY-PRO NRT drill chart for the correct pilot hole diameter before use. Power down and secure the workpiece before beginning any tapping operation. Apply a suitable tapping fluid or paste lubricant to the tap and workpiece to reduce friction and extend tool life. Use a tapping attachment or CNC rigid tapping cycle to maintain axial alignment and avoid tap breakage.