0.236
6
1.00
1/4
0.250
6.35
20
28
20
26
0.275
7
1.00
5/16
0.312
7.94
18
24
18
0.315
8
28
28
1.25
1.00
0.354
9
1.25
1.00
3/8
0.375
9.52
16
24
16
20
1/8
0.383
9.73
0.394
10
1.50
1.00
1/8
0.404
10.27
27
27
0.433
11
1.50
1.00
7/16
0.437
11.11
14
20
14
18
0.472
12
1.75
1.50
1/2
0.500
12.7
13
20
12
16
1/4
0.518
13.16
1/4
0.534
13.57
18
18
19
19
0.551
14
2.00
1.50
9/16
0.562
14.29
12
18
12
16
0.591
15
5/8
0.625
15.87
11
18
11
14
0.630
16
2.00
1.50
1.50
3/8
0.656
16.66
19
19
0.669
17
3/8
0.671
17.05
18
18
0.709
18
2.50
1.50
3/4
0.75
19.05
10
16
16
10
12
0.787
20
2.50
1.50
1.50
1/2
0.825
20.95
14
14
1/2
0.836
21.22
14
14
0.866
22
2.50
1.50
7/8
0.875
22.22
9
14
9
11
0.945
24
3.00
2.00
0.984
25
2.0 &1.5
1.50
1
1.0
25.4
8
12
12
16
8
10
1.024
26
3/4
1.041
26.44
14
14
3/4
1.046
26.57
14
14
1.063
27
3.00
2.00
1.102
28
1 1/8
1.125
28.57
7
12
8
7
9
1.181
30
3.50
2.00
1 1/4
1.25
31.75
7
12
8
16
7
9
1.26
32
1.50
1.50
1.299
33
3.50
1
1.308
33.23
11.5
11.5
1
1.309
33.25
11
11
1 3/8
1.375
34.92
6
12
8
6
8
1.378
35
THREAD SIZES AND SPECIFICA
TIONS
DIMENSIONS
U. S. ST
ANDARD
BRITISH ST
ANDARD
METRIC
NOMINAL SIZE
INCH
SIZE
THREADS PER INCH
THREADS PER INCH
PITCH IN MM
CONST
ANT PITCH
Pipe I.D.
Bolt & T
ube
O.D.
8 U.N.
12 U.N.
Major
Dia.
of Thread
Major*
Dia.
of Thread
Pipe
Tapered
N.P
.T
.
Pipe
Parallel (Conduit)
N.P
.S.
Bold,
National Course U.N.C.
Bold,
National
Fine U.N.F
.
API Casing
Long Thread
API Casing Non-Upset
Thread
API Casing Upset, Reg.
Thread
Pipe,
Tapered
BSPT
Pipe, Parallel BSPP
Conduit BSC (BEC)
Bolt,
Whitworth
BSW
Bolt, Fine
BSF
Coarse
ISO
Fine
ISO
Metric
Conduit
62
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