General Dimensions
tap style 1 STYLE 1 tap style 2 STYLE 2 tap style 3 STYLE 3
Nominal Diameter
Range - Inches
Machine
Screw
Size
No.
Nominal
Fractional
Diameter
Inches
Nominal
Metric
Diameter
Inches
STYLE* Tap Dimensions - Inches
Over To(Incl.) Overall
Length
A
Thread
Length
B
Square
Length
C
Shank
Diameter
D
Size of
Square
E
.052
.065
.078
.065
.078
.091
0
1
2
1/16 M1.6
M1.8
M2, M2.2
1
1
1
1-5/8
1-11/16
1-3/4
5/16
1-3/8
7/16
3/16
3/16
3/16
.141
.141
.141
.110
.110
.110
.091
.104
.117
.104
.117
.130
3
4
5
3/32

1/8
M2.5

M3, M3.15
1
1
1
1-13/16
1-7/8
1-15/16
1/2
9/16
5/8
3/16
3/16
3/16
.141
.141
.141
.110
.110
.110
.130
.145
.171
.145
.171
.197
6
8
10

5/32
3/16
M3.5
M4
M4.5, M5
1
1
1
2
2-1/8
2-3/8
11/16
3/4
7/8
3/16
1/4
1/4
.141
.168
.194
.110
.131
.152
.197
.223
.260
.223
.260
.323
12
14
7/32
1/4
5/16

M6, M6.3
M7, M8
1
2
2
2-3/8
2-1/2
2-23/32
15/16
1
1-1/8
9/32
5/16
3/8
.220
.255
.318
.165
.191
.238
.323
.395
.448
.395
.448
.510
  3/8
7/16
1/2
M10

M10, M12.5
2
3
3
2-15/16
3-5/32
3-3/8
1-1/4
1-7/16
1-21/32
7/16
13/32
7/16
.381
.323
.367
.286
.242
.275
.510
.573
.635
.573
.635
.709
  9/16
5/8
11/16
M14
M16
M18
3
3
3
3-19/32
3-13/16
4-1/32
1-21/32
1-13/16
1-13/16
1/2
9/16
5/8
.429
.480
.542
.322
.360
.406
.709
.760
.823
.760
.823
.885
  3/4
13/16
7/8

M20
M22
3
3
3
4-1/4
4-15/32
4-11/16
2
2
2-7/32
11/16
11/16
3/4
.590
.652
.697
.442
.489
.523
.885
.948
1.010
.948
1.010
1.073
  15/16
1
1-1/16
M24
M25
M27
3
3
3
4-29/32
5-1/8
5-1/8
2-7/32
2-1/2
2-1/2
3/4
13/16
7/8
.760
.800
.896
.570
.600
.672
1.073
1.135
1.198
1.135
1.198
1.260
  1-1/8
1-3/16
1-1/4

M30
3
3
3
5-7/16
5-7/16
5-3/4
2-9/16
2-9/16
2-9/16
7/8
1
1
.896
1.021
1.021
.672
.766
.766
1.260
1.323
1.385
1.323
1.385
1.448
  1-5/16
1-3/8
1-7/16
M33

M36
3
3
3
5-3/4
6-1/16
6-1/16
2-9/16
3
3
1-1/16
1-1/16
1-1/8
1.108
1.108
1.233
.831
.831
.925
1.448
1.510
1.635
1.510
1.635
1.760
  1-1/2
1-3/8
1-3/4

M39
M42
3
3
3
6-3/8
6-11/16
7
3
3-3/16
3-3/16
1-1/8
1-1/8
1-1/4
1.233
1.305
1.430
.925
.979
1.072
1.760
1.885
2.010
1.885
2.010
2.135
  1-7/8
2
2-1/8

M48
3
3
3
7-5/16
7-5/8
8
3-9/16
3-9/16
3-9/16
1-1/4
1-3/8
1-3/8
1.519
1.644
1.769
1.139
1.233
1.327
2.135
2.260
2.385
2.260
2.385
2.510
  2-1/4
2-3/8
2-1/2
M56

3
3
3
8-1/4
8-1/2
8-3/4
3-9/16
4
4
1-7/16
1-7/16
1-1/2
1.894
2.019
2.100
1.420
1.514
1.575
2.510
2.635
2.760
2.635
2.760
2.885
  2-5/8
2-3/4
2-7/8
M64

M72
3
3
3
8-3/4
9-1/4
9-1/4
4
4
4
1-1/2
1-9/16
1-9/16
2.225
2.350
2.475
1.669
1.762
1.856
2.885
3.010
3.135
3.010
3.135
3.260
  3
3-1/8
3-1/4


M80
3
3
3
9-3/4
9-3/4
10
4-9/16
4-9/16
4-9/16
1-5/8
1-5/8
1-3/4
2.543
2.668
2.793
1.907
2.001
2.095
3.260
3.385
3.510
3.385
3.510
3.635
  3-3/8
3-1/2
3-5/8


M90
3
3
3
10
10-1/4
10-1/4
4-9/16
4-15/16
4-15/16
1-3/4
2
2
2.883
3.008
3.133
2.162
2.256
2.350
3.635
3.760
3.885
3.760
3.885
4.010
  3-3/4
3-7/8
4


M100
3
3
3
10-1/2
10-1/2
10-3/4
5-5/16
5-5/16
5-5/16
2-1/8
2-1/8
2-1/4
3.217
3.342
3.467
2.413
2.506
2.600
*Styles shown are for ground thread taps.