MelBran's CNC Tapping Speed Guide 1-800-572-1358

See Conversion Table for SURFACE FEET PER MINUTE TO REVOLUTIONS PER MINUTE

Material

Speed

Feet Per

Minute
Aluminum Alloys     90-100
Brass     60-100
Bronze     40-60
Copper     40-60
High Temperature Alloys Cobalt Base 5-10
    Iron Base 10-15
    Nichel Base 5-10
Iron Ductile Annealed 60
    as Cast 30
    Tempered 15-20
  Gray Annealed 80
    as Cast 35-60
  Malleable   60
    Heat Treated 25-50
Mabnesium Alloys   Annealed 175
Manganese     20
Molybdenum Alloys Stress Relieved 50
Monel   Annealed 20
Nickel Alloys   Annealed 25
Plastics Reinforced   25
  Thermoplastics   50
  Thermosetting Plastic   50
Steels Alloys, Annealed or Cold Drawn 40-60
  Quenched & Tempered   15-35
  Armor Plate   10
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Material

Speed

Feet Per

Minute
(Steels Cont.) Carbon Steel, Plain Annealed 40-80
    Tempered 15-40
Cast, Carbon   Annealed 40-50
    Tempered 30
Cast, Corrosion Resistant Annealed 20-30
  heat Resistant as Cast 20-25
  Low Alloy Annealed 30-45
    Tempered 15-25
Precipition Hardening   Treated 10-15
Stainless   Annealed 15-45
    Tempered 15-25
  Free Machining Annealed 45-75
Tool Steels, High Speed   Annealed 15-25
  Water Hardening Annealed 50
Ulntra High Strength Steels Annealed 35
    Normalized 20
    Tempered 3-7
Maraging Steels   Annealed 20-15
    Maraged 5-10
Tantalum Alloys   Stress Relieved 3
Titanium Alloys Commercial Pure Annealed 40-60
  Alpha & Alpha Beta Alloys Annealed 10-25
Tungsten Alloys Pressed & Sintered   50
Zinc Alloys   Die Cast 50-150