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Home
About Us
Products
Hex Bolts
Socket Head Cap Screws
Socket Set Screws
Socket Countersunk Screws
Socket Button Head Screws
Hex Key Wrench
Nylock Nuts, Cap / Doom Nuts
Prevailing Torque Nuts
Hex Nuts / Special Nuts
Flange Nuts, Wing Nuts
Square Weld Nuts & Hex Weld Nuts
Cage Nuts, Rivet Nuts
Self Tapping Screws
Spring Washers, Plain Washers
Spring Dowell Pins
Circlips
Blind Rivets
Technical Info
Alliances
Services
Enquiry Now
Contact Us
Thread Identification (British)
Home
Thread Identification (British)
Thread
Identification (British)
Basic Major Diameter
Nominal Diameter (mm)
Threads Per Inch
Inch
mm
BA
BSW
BSF
BSP
BSPT
.0118
0.30
.0118
0.30
.0138
0.35
.0146
0.37
22
254
.0157
0.40
.0165
0.42
21
231
.0177
0.45
.0189
0.48
20
211 3/4
.0197
0.50
.0209
0.53
.0213
0.54
19
181 1/2
.0217
0.55
.0236
0.60
.0244
0.62
18
169 1/4
.0276
0.70
17
149 1/2
.0311
0.79
16
133 3/4
.0315
0.80
.0340
0.86
.0354
0.90
15
121
.0394
1.00
14
110 1/2
.0433
1.10
.0470
1.19
.0472
1.20
13
101 1/2
.0512
1.30
12
90 3/4
.0551
1.40
.0591
1.50
11
82
.0600
1.52
.0629
1.60
.0669
1.70
10
72 1/2
.0709
1.80
.0730
1.85
.0748
1.90
9
65
.0787
2.00
.0860
2.18
.0866
2.20
8
59
.0906
2.30
.0984
2.50
7
53
.0990
2.51
.1024
2.60
.1102
2.80
6
48
.1120
2.84
.1181
3.00
.1250
3.18
1/8
40
.1260
3.20
5
43
.1380
3.50
.1417
3.60
4
38 1/2
.1575
4.00
.1614
4.10
3
34 3/4
.1640
4.17
.1772
4.50
.1850
4.70
2
31 3/4
.1875
4.76
3/16
24
32
.1900
4.83
.1969
5.00
.2087
5.30
1
28 1/4
.2160
5.49
.2165
5.50
.2188
5.56
7/32
28
.2362
6.00
0
25 1/2
.2500
6.35
1/4
20
26
.2756
7.00
.2812
7.14
9/32
26
.3125
7.94
5/16
18
22
.3125
7.94
.3150
8.00
.3543
9.00
.3750
9.53
3/8
16
20
28
.3830
9.73
1/8
28
.3937
10.00
.4050
10.29
.4331
11.00
.4375
11.11
7/16
14
18
.4724
12.00
.5000
12.70
1/2
12
16
.5180
13.16
.5400
13.72
.5512
14.00
.5625
14.29
9/16
12
16
.6250
15.88
5/8
11
14
.6299
16.00
.6560
16.66
3/8
19
19
.6750
17.15
.6875
17.46
11/16
11
14
.7087
18.00
.7500
19.05
3/4
10
12
.7874
20.00
.8125
20.64
13/16
12
.8250
20.96
1/2
14
.8400
21.34
14
.8661
22.00
.8750
22.23
7/8
9
11
.9020
22.91
5/8
14
14
.9375
23.81
.9449
24.00
1.0000
25.40
1
8
10
1.0236
26.00
1.041011
26.44
3/4
14
14
1.0500
26.67
1.0625
26.99
1.0630
27.00
1.1250
28.58
1 1/8
7
9
1.1811
30.00
1.1875
30.16
1.1890
30.20
7/8
14
14
1.2500
31.75
1 1/4
7
9
1.2598
32.00
1.2992
33.00
1.3090
33.25
1
11
11
1.3125
33.34
1.3150
33.40
1.3750
34.93
1 3/8
8
1.3780
35.00
1.4173
36.00
1.4375
36.51
1.4920
37.90
1 1/8
11
1.4961
38.00
1.5000
38.10
1 1/2
6
8
1.5354
39.00
1.5625
39.69
1.5748
40.00
1.6250
41.28
1 5/8
8
1.6500
41.91
1 1/4
11
11
1.6535
42.00
1.6600
42.16
1.6875
42.86
1.7450
44.32
1 3/8
11
BA-British Association
BSW-British Standard Whitworth
BSF-British Standard Fine
BSP-British Standard Pipe
BSPT-British Standard Pipe Tapered
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