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The black-oxide finish on these taps retains lubricants to improve the taps' wear resistance and chip flow. Black-oxide taps should only be used on ferrous metals. These taps meet DIN length standards and have a longer overall length than taps that meet ISO, ANSI, and JIS length standards. They also meet ANSI shank standards, which means they measure their shank diameter in inches and fit in standard tools used in the U.S. This listing is for each. Technical Specification Item Spiral Flute Tap Thread Size 5/8-11 Thread Standard UNC Tap Material High Speed Steel Tap Finish Black Oxide Thread Length 11/16 in Overall Length 4 5/16 in 75% Thread Drill Size 13.60 Thread Limit Not Rated Class of Fit 2B Thread Direction Right Hand Number of Flutes 4 Tap Length Standard DIN Tap Shank Standard ANSI Primary Material Application Cast Iron, Hardened Steel, Steel 55% Thread Drill Size 14.20 mm 65% Thread Drill Size 13.90 mm Coolant Fed Non-Coolant Through Drill Bit Size 0.5305 in, 0.5364 in, 0.5423 in, 0.5482 in, 0.5541 in Extended Neck Yes Helix Angle 15 Degrees Material Grade - Machining Vanadium High Speed Steel Measurement System Fractional Inch Primary Material Application ISO Code H, K, P Secondary Material Application Stainless Steel Secondary Material Application ISO Code M Shank Length 3 19/32 in Shank Type - Machining Straight Square Size 0.3600 in Tap Chamfer Modified Bottom Thread Limit / Class of Fit 2B Threads per Inch 11 TPI Series 13014 Shank Dia. 15/32 in Tap Grouping Individual Tap Style Spiral Flute Tap Thread Size 5/8-11