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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. Coolant-through taps have holes that allow coolant to flow to their tip to reduce heat and friction during threading tasks. 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 1-8 Thread Standard UNC Tap Material High Speed Steel Tap Finish Black Oxide Thread Length 1 in Overall Length 6 9/32 in 75% Thread Drill Size 22.25 Thread Limit 2B Class of Fit 2B Thread Direction Right Hand Number of Flutes 5 Tap Length Standard DIN Tap Shank Standard DIN Primary Material Application Cast Iron, Steel 55% Thread Drill Size 29/32 in 65% Thread Drill Size 57/64 in Coolant Fed Coolant Through Drill Bit Size 0.8701 in, 0.8782 in, 0.8863 in, 0.8945 in, 0.9026 in Extended Neck Yes Features Horizontal Tapping Solutions for the Oil and Gas Industry Helix Angle 15 Degrees Material Grade - Machining 13024 Measurement System Fractional Inch Primary Material Application ISO Code K, P Secondary Material Application Stainless Steel Secondary Material Application ISO Code M Shank Length 5 9/32 in Shank Type - Machining Straight Square Size 0.6000 in Tap Chamfer Modified Bottom Thread Limit / Class of Fit 2B / 2B Threads per Inch 8 TPI Series 13024 Shank Dia. 51/64 in Standards DIN Tap Grouping Individual Tap Style Spiral Flute Tap Thread Size 1-8