Guhring 9039590095250 Thread Forming Tap 3/8-16 Unc

Product Description

The GUHRING 9039590095250 is a bottoming thread forming tap in the 3/8-16 UNC thread size, designed to cold-form internal threads without cutting or producing chips. It is made from High-Speed Steel-E-CO (HSS-E-CO) with a Titanium Nitride (TiN) coating for extended tool life and reduced friction. The tap carries a 2BX class of fit with an H8/H9 thread limit and features a right-hand thread direction. With an overall length of 2.9410 inches and a tapping depth of 1.4567 inches, it is suited for blind hole threading operations. Machinists and tool-room technicians are the primary users of this tap in production and maintenance environments.

This tap is used for blind hole threading in materials including steel, stainless steel, cast iron, and non-ferrous metals, corresponding to material application codes P, M, K, and N. The bottoming chamfer with 1.5 to 2 chamfered threads makes it appropriate for threading close to the bottom of a blind hole. It is part of the GUHRING Series 3959 and is configured for use without coolant-through capability. Five oil grooves support lubrication during the forming process, and the flute-to-diameter ratio is 3xD.

Key Features

• Bottoming chamfer with 1.5 to 2 chamfered threads for threading near the base of blind holes
• HSS-E-CO construction provides toughness and wear resistance in demanding materials
• Titanium Nitride coating reduces friction and extends tap service life
• Five oil grooves support lubrication throughout the forming operation
• 2BX class of fit with H8/H9 thread limit for controlled thread tolerance
• Right-hand, chip-free cold-forming action eliminates swarf in blind holes

Compatibility

Designed for blind hole thread forming in steel, stainless steel, cast iron, and non-ferrous metals. Suitable for use with standard 3/8-16 UNC tapping fixtures and holders accepting a 0.3810-inch shank diameter with a 0.2860-inch square drive.

Installation Notes

Thread forming taps require a properly sized forming tap drill hole, which differs from a standard cut-tap drill size — consult a forming tap drill chart for 3/8-16 UNC before drilling. Apply appropriate tapping fluid or cutting oil rated for the workpiece material before and during the tapping operation. Secure the workpiece and tap holder firmly; misalignment can cause tap breakage or out-of-tolerance threads. This tool is intended for use by qualified machinists familiar with thread forming processes.