5/16-18 Size x 0.5200" Thread Length x H3 Limit x 0.3180" Shank DIA, High Vanadium Powdered Metal - 3 FL - Steam Oxide Coated
5/16-18 Size x 0.5200" Thread Length x H3 Limit x 0.3180" Shank DIA, High Vanadium Powdered Metal High Performance - Spiral Flute Semi-Bottoming Tap, 3 Flutes, Steam Oxide Coated