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Workmanship

Form tap Tapping speeds

Form tap Tapping speeds

 

Thread size
Steel
Stainless Steel
Metric
Peripheral speed 7–10 m/min.

Peripheral speed 3–5 m/min.
M3X0.5
800 Rpm.
400 Rpm.
M4X0.7
700 Rpm.
350 Rpm.
M5X0.8
600 Rpm.
300 Rpm.
M6X1.0
500 Rpm.
250 Rpm.
M8X1.25
400 Rpm.
200 Rpm.
M10X1.5
320 Rpm.
160 Rpm.
M12X1.75
270 Rpm.
130 Rpm.
M14X2.0
230 Rpm.
120 Rpm.
M16X2.0
200 Rpm.
100 Rpm.
M18X2.5
180 Rpm.
100 Rpm.
M20X2.5
160 Rpm.
90 Rpm.
BSP
1/8BSP
320 Rpm.
160 Rpm.
1/4 BSP
270 Rpm.
130 Rpm.
3/8 BSP
200 Rpm.
100 Rpm.
1/2 BSP
160 Rpm.
90 Rpm.
3/4 BSP
140 Rpm.
80 Rpm.
1/1 BSP
120 Rpm.
60 Rpm.
UNC
N°5 UNC (40)
800 Rpm.
400 Rpm.
N°6 UNC (32)
800 Rpm.
400 Rpm.
N°8 UNC (32)
700 Rpm.
350 Rpm.
N°10 UNC (24)
700 Rpm.
350 Rpm.
N°12 UNC (24)
600 Rpm.
300 Rpm.
1/4 UNC (20)
500 Rpm.
250 Rpm.
5/16 UNC (18)
400 Rpm.
200 Rpm.
3/8 UNC (16)
350 Rpm.
175 Rpm.
7/16 UNC (14)
320 Rpm.
160 Rpm.
1/2 UNC (13)
270 Rpm.
130 Rpm.
9/16 UNC (12)
230 Rpm.
120 Rpm.
5/8 UNC (11)
200 Rpm.
100 Rpm.
3/4 UNC (10)
180 Rpm.
100 Rpm.
Metric Fine
M6X0.75
500 Rpm.
250 Rpm.
M6X0.5
500 Rpm.
250 Rpm.
M8X1.0
400 Rpm.
200 Rpm.
M8X0.75
400 Rpm.
200 Rpm.
M10X1.25
320 Rpm.
160 Rpm.
M10X1.0
320 Rpm.
160 Rpm.
M12X1.5
270 Rpm.
130 Rpm.
M12X1.0
270 Rpm.
130 Rpm.
M16X1.5
200 Rpm.
100 Rpm.
M16X1.0
200 Rpm.
100 Rpm.
M18X1.5
180 Rpm.
100 Rpm.
UNF
N°5 UNF (44)
800 Rpm.
400 Rpm.
N°6 UNF (40)
800 Rpm.
400 Rpm.
N°8 UNF (36)
700 Rpm.
350 Rpm.
N°10 UNF (32)
700 Rpm.
350 Rpm.
N°12 UNF (28)
600 Rpm.
300 Rpm.
1/4 UNF (28)
500 Rpm.
250 Rpm.
5/16 UNF (24)
400 Rpm.
200 Rpm.
3/8 UNF (24)
350 Rpm.
175 Rpm.
7/16 UNF (20)
320 Rpm.
160 Rpm.
1/2 UNF (20)
270 Rpm.
130 Rpm.
9/16 UNF (18)
230 Rpm.
120 Rpm.
5/8 UNF (18)
200 Rpm.
100 Rpm.
3/4 UNF (16)
180 Rpm.
100 Rpm.