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TAPPING.TXT
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1989-04-09
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Nominal Speeds for Tapping Stainless Steels (a)
Type of Condition (b) Brinell Speed,
steel hardness sfm
FM Fer Ann 135 to 185 50
FM Mar Ann 135 to 185 50
Ann or CD 185 to 240 40
Q and T 275 to 325 30
Q and T 375 to 425 10
FM Aus Ann 135 to 185 40
CD 225 to 275 35
Ferritic Ann 135 to 185 30
Mar(410) Ann 135 to 185 35
Ann 175 to 225 30
Q and T 275 to 325 20
Q and T 375 to 425 10
Mar(431) Ann 225 to 275 25
Q and T 275 to 325 20
Q and T 375 to 425 10
Mar(440) Ann 225 to 275 20
Q and T 275 to 325 15
Q and T 375 to 425 10
Q and T Rc 48 to 52 5
Aus(304) Ann 135 to 185 25
CD 225 to 275 20
Aus(316) Ann 135 to 185 20
(a) For tapping steels under 375 Bhn, M10, M7 and M1 high speed steel taps.
For steels over 375 Bhn, M3 and M40 taps.
(b) Ann = Annealed CD = Cold drawn Q and T = Quenched and tempered
Hard = Hardened N and T = Normalized and tempered