Osg 1400107708 Thread Forming Tap 5-40 Unc Cobalt Ticn

Product Description

The OSG 1400107708 is a thread forming tap designed for right-hand, blind-hole threading in a 5-40 UNC configuration. Built from cobalt high-speed steel and finished with a TiCN coating, this tap cold-forms internal threads without cutting, displacing material to produce a stronger thread form with no chips to clear from the hole. The modified bottoming chamfer spans 2 to 2.5 threads, allowing the tap to engage close to the bottom of a blind hole. Overall length is 1.938 inches with a thread limit of H3 and a Class of Fit of 3B. It is sold individually and intended for use by machinists, tool-and-die makers, and maintenance technicians working in precision threading applications.

This tap is suited for production and maintenance threading operations across a range of ferrous and non-ferrous materials. Rated material applications include alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel. The blind-hole application focus makes it a practical choice for threaded fastener locations where through-hole tapping is not possible. The HY-PRO NRT series designation indicates it is engineered for roll-form tapping, where material ductility allows cold working rather than chip-generating cutting.

Key Features

• Thread forming (roll form) design eliminates chips in blind-hole applications
• Cobalt construction provides heat resistance and durability in tough alloys and hardened steel
• TiCN coating reduces friction and extends tool life across varied material types
• Modified bottoming chamfer (2 to 2.5 threads) enables threading close to hole bottom
• H3 thread limit with 3B Class of Fit for precise thread tolerance control
• Right-hand thread direction, no coolant-through requirement

Compatibility

Designed for blind-hole thread forming in ductile metals including alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel where a 5-40 UNC internal thread is required.

Installation Notes

Thread forming taps require a properly sized forming tap drill — the pilot hole diameter must be larger than a standard cut tap drill to allow material displacement without overloading the tap. Use appropriate tapping fluid or cutting oil rated for the workpiece material, especially when working with stainless steel or alloy steel. Secure the workpiece and use a calibrated tap handle or CNC tapping cycle with synchronous feed to avoid breakage. Inspect the tap for wear or chipping before each use, as a damaged forming tap can seize in a blind hole.