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Metres | Recommended | |||
---|---|---|---|---|
Material | per Min | Through | Blind | Hole|Hole | Lubricant |
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.