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+1 (217) 579-8045Union Butterfield Spiral Point Tap, Series: 1659AP Applix HMD, Measurement System: Metric, UNC Thread Standard, M3x0.5 Thread, Plug Chamfer, 3 Flutes, HSS, TiAlN Coated, Class of Fit: 6H, Right Hand Cutting Direction, 11 mm Thread Length, 56 mm Overall Length, 0.141 in Shank Diameter, D3 Thread LimitDesigned for through hole tapping materials with a hardness of >38 RcPremium substrate provides superior abrasion resistance and edge strengthTiAlN top coating lowers the coefficient of friction, improves thread quality, affords higher operating speeds and longer tool life