Osg 1400135000 Thread Forming Tap 3/8-16 Unc Cobalt H4

Product Description

The OSG 1400135000 is a thread forming tap in the HY-PRO NRT series, designed for cold-form tapping of internal threads without cutting or producing chips. This 3/8-16 UNC tap features a modified bottoming chamfer with 2 to 2.5 chamfered threads, allowing it to thread close to the bottom of a blind hole. Built from cobalt high-speed steel with a bright finish, it carries a thread limit of H4 and operates in right-hand thread direction. The overall length is 2.9380 inches, with a tapping depth of 1.2520 inches. It is installed by machinists and tool-and-die professionals in production and maintenance environments.

This tap is suited for blind hole threading applications across a range of materials including alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel. The thread forming method displaces material rather than cutting it, resulting in stronger thread flanks and no chip evacuation concerns. It is commonly used in CNC tapping centers, drill presses, and tapping fixtures where consistent thread quality and tool life are priorities in medium to high-volume production runs.

Key Features

• Modified bottoming chamfer with 2 to 2.5 chamfered threads for threading close to blind hole bottom
• Cobalt high-speed steel construction for added heat and wear resistance in tough materials
• Thread forming design displaces material to create stronger threads with no chip production
• H4 thread limit for controlled fit and dimensional consistency
• Right-hand, 3/8-16 UNC thread form for standard unified coarse applications
• No coolant-through requirement simplifies setup on standard tapping equipment

Compatibility

Suitable for blind hole thread forming in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces. Material application codes P and N apply.

Installation Notes

Thread forming taps require a specific tap drill size optimized for forming rather than cutting, so verify the correct drill diameter before use. Power down and secure the workpiece in the machine before tap installation. Use a tapping fluid or cutting oil appropriate for the workpiece material to reduce friction and extend tool life. Follow machine tool manufacturer guidelines for spindle speed and feed rate when setting up the tapping cycle.