Osg 1400105708 Thread Forming Tap 4-40 Unc Cobalt Ticn

Product Description

The OSG 1400105708 is a thread forming tap designed for producing 4-40 UNC internal threads without cutting chips. Rather than removing material, thread forming taps cold-form the thread profile, which results in stronger threads and eliminates chip evacuation concerns. This tap is manufactured from cobalt high-speed steel and carries a TiCN coating for increased surface hardness and heat resistance. With a modified bottoming chamfer of 2 to 2.5 threads, it is suited for threading close to the bottom of blind holes. The overall length is 1.875 inches with a tapping depth of 0.559 inches. Machinists and toolroom technicians use this tap in CNC machining centers, drill presses, and manual tapping setups.

This tap is intended for blind hole threading applications across a wide range of metallic workpiece materials including alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel. It is well suited for high-production environments where thread strength and surface finish are critical. The modified bottoming chamfer allows threading deeper into blind holes compared to standard plug or taper chamfer taps. The right-hand thread direction follows standard UNC thread convention. This is a Series 14001 HY-PRO NRT tap from OSG.

Key Features

• Thread forming design eliminates chips, reducing the risk of chip packing in blind holes
• Cobalt construction provides increased heat and wear resistance over standard HSS
• TiCN coating reduces friction and extends tool life in abrasive and hard materials
• Modified bottoming chamfer of 2 to 2.5 threads allows threading close to hole bottom
• H7 thread limit suits close-tolerance UNC thread fit requirements
• Right-hand, 4-40 UNC thread profile for standard fastener applications

Compatibility

Designed for 4-40 UNC blind hole threading 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 forming tap drill size, which differs from standard cut tap drill sizes — consult a forming tap drill chart before setup. Ensure the tapping machine or tap handle is properly aligned to avoid tap breakage, particularly in small-diameter taps such as this 4-40 size. Use a lubricant or cutting fluid appropriate for the workpiece material to reduce forming forces and extend tap life. Do not use this tap as a cut tap or attempt to reverse-thread an already cut hole.