British Std Fine
| Size |
Outside Dia Inch |
Tpi |
Pitch Inch |
Core Dia Inch |
Radius Inch |
Thread Depth Thou |
Hex A/flats Inch |
Head Depth Inch |
Washer Face Dia Inch |
Standard Nut Depth Inch |
Lock Nut Depth Inch |
Tapping Drill Size Inch |
Tapping Drill Size mm |
Letter Or Number |
Id |
|
3/16
|
0.188
|
32
|
0.031
|
0.148
|
0.004
|
20
|
0.338
|
|
|
|
|
0.156
|
3.9
|
5/32
|
1
|
|
7/32
|
0.219
|
28
|
0.036
|
0.173
|
0.005
|
23
|
|
|
|
|
|
0.183
|
4.6
|
14
|
2
|
|
1/4
|
0.250
|
26
|
0.039
|
0.201
|
0.005
|
25
|
0.445
|
0.176
|
0.428
|
0.200
|
0.185
|
0.209
|
5.3
|
4
|
3
|
|
9/32
|
0.281
|
26
|
0.039
|
0.232
|
0.005
|
25
|
|
|
|
|
|
0.238
|
6.0
|
B
|
4
|
|
5/16
|
0.313
|
22
|
0.045
|
0.254
|
0.006
|
29
|
0.525
|
0.218
|
0.508
|
0.250
|
0.210
|
0.266
|
6.7
|
17/64
|
5
|
|
3/8
|
0.375
|
20
|
0.050
|
0.311
|
0.007
|
32
|
0.600
|
0.260
|
0.582
|
0.312
|
0.260
|
0.323
|
8.2
|
P
|
6
|
|
7/16
|
0.438
|
18
|
0.056
|
0.366
|
0.008
|
36
|
0.710
|
0.302
|
0.690
|
0.375
|
0.275
|
0.375
|
9.7
|
3/8
|
7
|
|
1/2
|
0.500
|
16
|
0.063
|
0.420
|
0.009
|
40
|
0.820
|
0.343
|
0.800
|
0.437
|
0.300
|
0.438
|
11.0
|
7/16
|
8
|
|
9/16
|
0.563
|
16
|
0.063
|
0.483
|
0.009
|
40
|
0.920
|
0.375
|
0.900
|
0.500
|
0.333
|
0.500
|
12.6
|
1/2
|
9
|
|
5/8
|
0.625
|
14
|
0.071
|
0.534
|
0.010
|
46
|
1.010
|
0.417
|
0.985
|
0.562
|
0.375
|
0.547
|
14.0
|
35/64
|
10
|
|
11/16
|
0.688
|
14
|
0.071
|
0.596
|
0.010
|
46
|
1.100
|
|
|
|
|
0.609
|
15.5
|
39/64
|
11
|
|
3/4
|
0.750
|
12
|
0.083
|
0.643
|
0.011
|
53
|
1.200
|
0.500
|
1.175
|
0.687
|
0.458
|
0.656
|
16.7
|
21/32
|
12
|
|
13/16
|
0.813
|
12
|
0.083
|
0.706
|
0.011
|
53
|
|
|
|
|
|
0.719
|
18.3
|
23/32
|
13
|
|
7/8
|
0.875
|
11
|
0.091
|
0.759
|
0.013
|
58
|
1.300
|
0.583
|
1.273
|
0.750
|
0.500
|
0.781
|
19.7
|
25/32
|
14
|
|
1
|
1.000
|
10
|
0.100
|
0.872
|
0.014
|
64
|
1.480
|
0.666
|
1.453
|
0.875
|
0.583
|
0.891
|
22.7
|
57/64
|
15
|
|
1 1/8
|
1.125
|
9
|
0.111
|
0.983
|
0.015
|
71
|
1.670
|
0.750
|
1.620
|
1.000
|
0.666
|
1.000
|
25.4
|
1
|
16
|
|
1 1/4
|
1.250
|
9
|
0.111
|
1.108
|
0.015
|
71
|
1.860
|
0.830
|
1.795
|
1.125
|
0.750
|
1.125
|
28.6
|
1 - 1/8
|
17
|
|
1 3/8
|
1.375
|
8
|
0.125
|
1.215
|
0.017
|
80
|
2.050
|
0.920
|
1.985
|
1.250
|
0.833
|
1.234
|
31.5
|
1 - 15/64
|
18
|
|
1 1/2
|
1.500
|
8
|
0.125
|
1.340
|
0.017
|
80
|
2.220
|
1.000
|
2.155
|
1.375
|
0.916
|
1.359
|
34.5
|
1 - 23/64
|
19
|
|
1 5/8
|
1.625
|
8
|
0.125
|
1.465
|
0.017
|
80
|
2.410
|
|
|
|
|
1.486
|
37.8
|
1 - 15/32
|
20
|
|
1 3/4
|
1.750
|
7
|
0.143
|
1.567
|
0.020
|
92
|
2.580
|
1.170
|
2.495
|
1.625
|
1.083
|
1.600
|
40.7
|
1 - 5/8
|
21
|
|
2
|
2.000
|
7
|
0.143
|
1.817
|
0.020
|
92
|
2.760
|
1.330
|
2.675
|
1.750
|
1.166
|
1.835
|
46.6
|
1 - 27/32
|
22
|
|
2 1/4
|
2.250
|
6
|
0.167
|
2.036
|
0.023
|
107
|
3.150
|
|
|
|
|
2.050
|
52.4
|
2 - 1/16
|
23
|
|
2 1/2
|
2.500
|
6
|
0.167
|
2.286
|
0.023
|
107
|
3.550
|
|
|
|
|
2.330
|
59.0
|
2 - 5/16
|
24
|
|
2 3/4
|
2.750
|
6
|
0.167
|
2.536
|
0.023
|
107
|
3.890
|
|
|
|
|
2.560
|
65.0
|
2 - 9/16
|
25
|
|
3
|
3.000
|
5
|
0.200
|
2.743
|
0.028
|
128
|
4.187
|
|
|
|
|
2.780
|
70.6
|
2 - 25/32
|
26
|