Product details:

These taps are designed for tapping stainless steel. They have a hardlube coating that protects them from wear. Sometimes called hardslick, hardlube has an inner layer of titanium aluminum nitride (TiAlN) and an outer layer of tungsten carbide/carbon (WC/C). The TiAlN layer withstands high temperatures and protects the taps from wear. The WC/C layer has a low coefficient of friction and helps prevent chips from sticking to the tool in dry-machining applications. This listing is for each. Technical Specification Item Spiral Point Tap Thread Size 5/16-18 Thread Standard UNC Tap Material HSS-E Tap Finish Hardslick Thread Length 21/32 in Overall Length 6 in 75% Thread Drill Size F Thread Limit H3 Class of Fit H3 Thread Direction Right Hand Number of Flutes 3 Primary Material Application Stainless Steel, Steel 55% Thread Drill Size I 65% Thread Drill Size 17/64 in Drill Bit Size F Extended Neck Yes Measurement System Fractional Inch Primary Material Application ISO Code M, P Secondary Material Application Aluminum, Brass, Bronze, Copper, Steel Secondary Material Application ISO Code N, P Series M3 Shank Dia. 5/32 in Shank Length 5 11/32 in Shank Type - Machining Straight Spiral Direction Neutral Standards ANSI Tap Chamfer Plug Tap Grouping Individual Tap Thread Size 5/16-18 Threads per Inch 18 Thread Limit / Class of Fit H3 / H3