Kennametal 4131973 Thread Forming Tap 8-32 Unc Bottoming Hss

Product Description

The KENNAMETAL 4131973 is a thread forming tap sized 8-32 UNC with a bottoming chamfer, designed for cold-forming internal threads without cutting. Rather than removing material, it displaces metal to produce stronger, chip-free threads. Built from Vanadium High Speed Steel (HSS-E) with a bright uncoated finish, this tap is suited for right-hand threading in non-ferrous metals. It delivers an H3 thread limit, making it appropriate for close-tolerance work. Overall length is 2.125 inches with a thread length of 0.375 inches. Licensed HVAC, plumbing, and general mechanical trades will find this tap useful for precision blind-hole applications in aluminum, brass, and similar materials.

This tap is configured for blind hole threading, where a bottoming chamfer of 1.5 to 2 threads allows threading close to the bottom of a drilled hole. The 8-32 UNC thread size is a common fastener standard in light mechanical assemblies, HVAC equipment brackets, electrical enclosures, and instrumentation panels. The right-hand thread direction aligns with standard fastener conventions. The H3 thread limit designation ensures compatibility with standard GO/NO-GO gauging practices for quality verification in production or field repair work.

Key Features

• Thread forming design produces chip-free threads, reducing the risk of debris in blind holes
• Bottoming chamfer (1.5-2P) allows threading to within 1-2 pitches of hole bottom
• Vanadium High Speed Steel (HSS-E) construction for improved wear resistance over standard HSS
• H3 thread limit for close-tolerance right-hand 8-32 UNC threads
• Bright uncoated finish suitable for use with standard cutting fluids on non-ferrous metals
• Right-hand thread direction compatible with standard toolholders and tap wrenches

Compatibility

Designed for blind hole thread forming in non-ferrous metals such as aluminum, brass, and copper alloys. Suitable for use in standard 8-32 UNC tapping applications where chip-free thread production is required.

Installation Notes

Thread forming taps require a specific drill size larger than that used for cut taps — consult the appropriate forming tap drill chart for 8-32 UNC before drilling. Ensure the workpiece is properly secured before tapping. Apply a suitable tapping fluid or lubricant for the base material to reduce tool wear and improve thread quality. Do not use this tap on ferrous metals or hardened materials, as the material application is rated for non-ferrous metals only.