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TECHNICAL INFO - General Dimensions on Long Shank Machine Taps
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Dimensions on long shank taps  

TABLE SHOWS GENERAL DIMENSIONS ON LONG SHANK MACHINE TAPS
NOMINAL DIA d
MM's 		NOMINAL DIA d
INCHES 		THREAD DESIGNATIONS
LENGTH DIA OF SHANK LENGTH
OF
SQAURE		 SIZE OF
SQUARE
ABOVE UP TO ABOVE UP TO

ISO
METRIC

UNC UNF BSW BSF BA OVERALL
LENGTH
L		 LENGTH OF
THREAD
MAX 		D 2 a
2.80
3.20
3.60
3.60
4.00
4.50
4.50
5.00
5.60
6.35
7.20
8.00
9.00
9.00
10.00
10.60
11.80
13.20
15.00

17.00

21.20
23.60 		3.20
3.60
4.00(M)
4.50(O)
4.50(M)
5.00(O)
5.00(M)
5.60
6.35
7.20
8.00
9.00
10.00(D)
10.00(M)
10.60
11.80
13.20
15.00
17.00

21.20

23.60
26.50 		.1102
.1260
.1417
.1575
.1575
.1772
.1772
.1969
.2205
.2500
.2835
.3150
.3543
.3543
.3937
.4173
.4646
.5197
.5906

.6693

.8346
.9291

.1260
.1417
.1575
.1772
.1772
.1969
.1969
.2205
.2500
.2835
.3150
.3543
.3937
.3937
.4173
.4646
.5197
.5906
.6693

.8346

.9291
1. 0433

 M3
M3.5
M4

M4.5

M5

M6
M7
M8
M9

M10

M11
M12
M14
M16

M18
M20
M22
M24

No.5-40
No.6-32

No.8-32

No.10-24

No.12-24
0.25 -20

5/16-18

3/8-16


7/16-14
0.5-13
9/16-12
5/8-11


3/4-10
7/8-9
1"-8

No.5-44
No.6-40

No.8-36

No.10-32

No.12-28
0.25 -28

5/16-24

3/8-24


7/16-20
0.5-20
9/16-18
9/16-18


3/4-16
7/8-14
1"-12		 1/8-40
"



3/16-24


0.25 -20

5/16-18

3/8-16


7/16-14
0.5-12
9/16-12
5/8-11


3/4-10
7/8-9
1"-8




3/16-32


0.25 -26
9/32-26
5/16-22

3/8-20


7/16-18
0.5-16
9/16-16
5/8-14


3/4-12
7/8-11
1"-10

5
4

3

2

1
0

66
68
73
73
73
79
79
84
89
89
97
97
108
108
114
115
119
127
137

149
149
158
172

11
13
13
13
13
16
16
17
19
19
22
22
24
24
24
25
29
30
32

37
37
38
45

2.24
2.50
3.15
3.15
3.55
3.55
4.00
4.00
4.50
5.60
6.30
7.10
7.10
8.00
7.10
8.00
9.00
11.20
12.50

14.00
14.00
16.00
18.00

4
4
5
5
5
5
6
6
6
7
8
8
8
9
8
9
10
12
13

14
14
16
18




 1.80
2.00
2.50
2.50
2.80
2.80
3.15
3.15
3.55
4.50
5.00
5.60
5.60
6.30
5.60
6.30
7.10
9.00
10.00

11.20
11.20
12.50
14.00
Certain Tap Blanks shown above are recommended for ISO Metric Threads and some only for Thread Forms. Where they are different the size range for ISO Metric are marked (M) and the size range for other thread forms are marked (O). For sizes above 26.50mm dia. the general dimensions are as for a Short Machine Tap but overall length increased by 50% of the Shank Length.
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