Osg 1400106105 Thread Forming Tap 4-40 Unc Plug

Product Description

The OSG 1400106105 is a thread forming tap in the HY-PRO NRT series, designed for cold-forming internal threads without cutting chips. Operating on a 4-40 UNC thread form with a plug chamfer, this tap displaces material rather than removing it, producing stronger threads and eliminating the need to clear chips from blind or through holes. Built from cobalt high-speed steel with a TiN coating, it handles the heat and abrasion of production tapping in tough materials. The H5 thread limit and 2B class of fit make it suitable for standard UNC fastener applications. Licensed machinists and toolroom technicians are the primary installers.

This tap is suited for through-hole threading operations in materials including alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel. It fits applications where chip-free thread forming is preferred, such as high-volume production runs or situations where chip evacuation is a concern. The plug chamfer provides a gradual lead-in with 4 to 4.5 chamfered threads, making it appropriate for through-hole work where the tap can extend past the material. Material application codes P and N confirm suitability for both ferrous and non-ferrous metals.

Key Features

• Cold-forming design produces threads without chips, reducing breakage risk and improving thread strength
• Cobalt HSS construction provides increased heat and wear resistance over standard M2 HSS
• TiN coating reduces friction and extends tool life in abrasive materials
• Plug chamfer with 4 to 4.5 chamfered threads suits through-hole threading applications
• H5 thread limit and 2B class of fit meet standard UNC fastener tolerances
• Right-hand thread direction for standard machine tapping setups

Compatibility

Designed for through-hole threading of 4-40 UNC threads 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 adequate lubrication or cutting fluid matched to the workpiece material to prevent galling and tap breakage. Ensure the tapping machine or drill press spindle speed is appropriate for the workpiece material and tap diameter before starting. Secure the workpiece firmly and verify hole diameter is correct for a forming tap, as forming taps require a larger pilot hole than cutting taps of the same thread size. Do not reverse the tap under load without confirming the machine setup supports it.