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Tapping

Calculations for Speed:
RPM = (3.82 x FPM) / diameter
FPM = (RPM x dia.) / 3.82
 
Tapping speeds shown are approximate and may vary for each application.  If you need additional information, please call our technical support at 239-314-4303.
 
Chart below shows Tapping Speed in FPM.
The numbers across the top (columns) are Threads Per Inch 
 
Material

7 or less

8-15

16-24

Over 24

Possible Surface
Treatments
Zinc & Magnesium
Alloys Wrought & Cast

65

77

88

100

04, 88, 89

Aluminum Alloys
Wrought
Cast
 
50
50
 
67
67
 
83
83
 
100
100
 
04, 88, 89
04, 88, 89, 90
Brass

50

60

70

80

02, 04, 82, 88

Cast Iron
Gray, as cast
 
25
 
28
 
32
 
35
 
23, 84, 89
Copper

25

28

32

35

02, 04, 82, 88

Iron
Ductile & Malleable
 
20
 
27
 
33
 
40
 
03, 23, 84, 88, 89, 90
Bronze

20

25

30

35

02, 04, 82, 88

Carbon Steel
Low, Med. & Leaded
Medium Carbon
 
20
20
 
30
23
 
40
27
 
50
30
 
03, 23, 84, 88, 89, 90
03, 23, 84, 88, 89, 90
Alloy Steel
4 - series
 
15
 
18
 
22
 
25
 
03, 23, 84, 88, 89, 90
Stainless Steel
Free Machining
300 series, Cold Drawn
Precipitation Hardening 
 
20
15
8
 
27
18
12
 
33
22
16
 
40
25
20
 
03, 23, 84, 88, 89, 90
03, 23, 84, 88, 89, 90
03, 23, 84, 88, 89, 90
Titanium Alloys
Under Rc30
Rc 30-40
 
15
5
 
18
8
 
22
12
 
25
15
 
04, 23, 82, 84, 90
04, 23, 82, 84, 90
Tool & Die Steel
S, L, A, O & D Series
 
10
 
13
 
17
 
20
 
03, 23, 84, 88, 89, 90
High Temp Alloys
Monel, Nickel
Inconel
 
8
5
 
12
7
 
16
8
 
20
10
 
23, 82, 84, 88, 89, 90
23, 82, 84, 88, 89, 90
 
Surface Treatment Codes:
02 - Nitride
22 - Double Nitride
03 -Steam Oxide
23 - Nitride & Oxide
04 - Chrome Plate
88 - Titanium Nitride
89 - Titanium Carbonitride
84 - Titanium Aluminum Nitride
90 - Chromium Carbide
82 - Chromium Nitride
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