20. Carbide Taps

■Toughness and Hardness of Cemented Carbide and HSS ■Chamfer wear and number of holes of Carbide taps and HSS taps

Deflective Strength (MPa) (HRA) Hardness

Cutting Condition Tap : M5×0.8P4 Chamfer : 3 pitches Machine : Machine with multi spindles Hole Size : 4.2mm Thread Length : 10mm Through Fluid : water soluble Workpiece : GG-25

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

ClassificationSizeM2×0.4M8×1.25M6×1M8×1.25M10×1.25
WorkpieceMaterialPlastic with glass fibreAluminum alloy die casting (Si = 12%)GG-25GG-25GG-25
Part's nameElectric PartsCar PartsElectric PartsCar PartsCar Parts
ThreadTapping Hole. condition�1.6 Through�6.7 Blind�5.0 Blind�6.7 Blind�8.7 Blind
ConditionTapping Length4mm18mm10mm16mm18mm
MachineSpecial MachineSpecial Machine4 spindle MachineMulti Spindle MachineSpecial Machine
Condition of UseCutting Speed6.3m/min8.5m/min8m/min6m/min5.7m/min
FluidDryWater solubleWater solubleWater solubleWater soluble
Carbide Tap10.00075.40053.00018.86038.500
Number of HolesHSS Tap2001.0001.000300500
Comparison of Life5075.45362.977

Note : In all situations, HSS taps being used are standard oues. Carbide taps, when used properly, bring out a long tool life. These datum have come from end users of carbide taps.