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

M12, 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