ective StrengthDe Hardness Indicator drop chamfer wear Description of productsTechnical Information 20. Carbide Taps ■Toughness and Hardness of Cemented Carbide and HSS ■Chamfer wear and number of holes of Carbide taps and HSS taps De ective Strength (MPa) Hardness (HRA) Cutting Condition Tap : M5×0.8P4 Chamfer : 3 pitches Machine : Machine with multi spindles Hole Size : φ4.2mm Thread Length : 10mm Through Fluid : water soluble Workpiece : FC250 HSS taps Carbide taps P50 UF・A UF・B SKH51 SKH58 (SKH9) (AISI M7) Number of holes Cemented Carbide HSS ■Carbide Tap examples and comparison of tool life Size M2×0.4 M8×1.25 M6×1 M8×1.25 M10×1.25 Classi cation Material Plastic with glass ber ADC12 FC250 FC250 FC250 Workpiece Part's name Electric Parts Car Parts Electric Parts Car Parts Car Parts Thread Tapping Hole.conditionφ1.6 Through φ6.7 Blind φ5.0 Blind φ6.7 Blind φ8.7 Blind Condition Tapping Length Machine Special Machine Special Machine 4 spindle Machine Multi Spindle Machine Special Machine Condition of Use Cutting Speed Fluid Dry Water soluble Water soluble Water soluble Water soluble Carbide Tap Number of Holes HSS Tap Comparison of Life Note : In all situations, HSS taps being used are standard ones. Carbide taps, when used properly, bring out a long tool life. These datum have come from end users of carbide taps. Technical-62