Solid Carbide Internal Thread Relief Mills by AB Tools, Inc. Special orders in 4-6 working days. Proudly made in the USA by AB Tools, Inc.
*Necks ground longer on request with minimal charges based upon quantity.
Undercut diameter: Pitches finer than 20 TPI = thread basic major dia + .0075 Pictches of 20 TPI and courser = thread basic major dia. + .0150