Table of Recommended Taps for Machine Use, Speed, and Lubricant

SUGGESTED TAPS (GUIDE TO KEY LETTERS)

  1. Spiral Point Tap
  2. Standard Bottoming Tap
  3. Spiral Flute Tap
  4. Standard Plug Tap
  5. Standard Set
  6. Serial Set
 MetresRecommended  
Materialper MinThrough | BlindHole|HoleLubricant
Aluminium
(Si<10%)
25 - 40 A,E B,C,E Sol. Oil
Brass 25 - 30 B,E B,E Light Base Oil
Bronze 10 - 20 B,E B,E Light Base Oil
Copper 27 - 3 A,E B,E Light Base Oil
Plastic 18 - 21 E B,E Dry
DIE CASTINGS    
Aluminium
(Si>10%)
8 - 12 A,E B,E,C Sol. Oil
Zinc 18 - 21 A,E B,E,C Sol. Oil
Fibre 26 - 29 A,E B,E Dry
IRON    
Malleable 6 - 12 A,E B,E,F,C Sol. Oil
STEEL    
Cast 6 - 12 E,F B,E,F,C Sulph. Base Oil
Chrome 3 - 8 E,G B,E,F,G Sulph. Base Oil
MILD STEELS    
CARBONE        
Up to 0.4% 12 - 21 A,E,F B,E,F,C Sulph. Base Oil
0.4% to 0.7% 9 - 15 A,E,G B,E,G Sulph. Base Oil
more than 0.7% 7 - 10 A,E,G B,E,G Sulph. Base Oil
Stainless Steel 4 - 8 A,E,G B,E,G Sulph. Base Oil

The above suggestions must be considered as being of a general nature. Various materials and conditions may require experiment. We strongly recommend wherever possible the use of STANDARD TAPS. They can be obtained from stock and are considerably less expensive than specials.