BSC (British Standard Cycle) This fine thread profile was formulated for, and is well suited to cycle and motorcycle applications. Its fine pitch, allows high torque settings, and resists the tendancy to loosen under vibration, the larger core diameter also gives greater shear strength. Angle of thread = 60deg

 

Actions 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 Std Nut Depth Inch Lock Nut Depth Inch Tapping Drill Size Inch Tapping Drill Size Mm Letter Or Number
7 swg RH 0.056 56 0.018 0.037 0.003 10 0.039 1.0 61
7 swg RH 0.056 62 0.016 0.039 9 0.042 1.1 57
16 swg RH 0.064 56 0.018 0.039 0.003 10 0.039 1.0 61
16 swg RH 0.064 62 0.016 0.047 9 0.047 1.2 3/64
15 swg RH 0.072 56 0.018 0.055 0.003 10 0.055 1.4 54
15 swg RH 0.072 62 0.016 0.060 0.003 9 0.063 1.6 1/16
14 swg RH 0.080 56 0.018 0.061 0.003 10 0.063 1.6 1/16
14 swg RH 0.080 62 0.016 0.063 0.003 9 0.063 1.6 1/16
13 swg RH 0.092 56 0.018 0.073 0.003 10 0.075 1.9 48
12 swg RH 0.104 44 0.023 0.080 0.003 10 0.081 2.1 46
11 swg RH 0.116 44 0.023 0.095 0.003 12 0.096 2.5 41
1/8 RH 0.125 40 0.025 0.098 0.004 13 0.100 2.5 39
10 swg RH 0.128 44 0.023 0.104 0.004 12 0.106 2.7 36
9 swg RH 0.144 40 0.025 0.115 0.004 13 0.116 3.0 32
5/32 RH 0.156 32 0.031 0.123 0.005 17 0.129 3.2 30
8 swg RH 0.160 40 0.025 0.133 0.004 13 0.136 3.5 29
7 swg RH 0.177 32 0.031 0.143 0.005 17 0.144 3.7 27
3/16 RH 0.188 32 0.031 0.154 0.005 17 0.338 0.156 4.0 5/32
7/32 RH 0.219 26 0.039 0.178 0.006 21 0.180 4.6 15
1/4 RH 0.250 26 0.039 0.209 0.006 21 0.445 0.176 0.428 0.200 0.185 0.213 5.4 3
17/64 RH 0.266 26 0.039 0.225 0.006 21 0.228 5.8 1
9/32 RH 0.281 26 0.039 0.240 0.006 21 0.242 6.2 C
5/16 RH 0.313 26 0.039 0.272 0.006 21 0.525 0.218 0.508 0.250 0.210 0.275 7.0 J
3/8 RH 0.375 26 0.039 0.334 0.006 21 0.600 0.260 0.582 0.312 0.260 0.339 8.6 R
7/16 RH 0.438 26 0.039 0.397 0.006 21 0.710 0.302 0.690 0.375 0.275 0.397 10.1 X
7/16 RH 0.438 20 0.050 0.384 0.008 27 0.710 0.302 0.690 0.375 0.275 0.386 9.8 W
1/2 RH 0.500 26 0.039 0.459 0.006 21 0.820 0.343 0.800 0.437 0.300 0.469 11.7 15/32
1/2 RH 0.500 20 0.050 0.447 0.008 27 0.820 0.343 0.800 0.437 0.300 0.453 11.5 29/64
9/16 RH 0.563 26 0.039 0.522 0.006 21 0.900 0.375 0.900 0.500 0.333 0.531 13.3 17/32
9/16 RH 0.563 20 0.050 0.509 0.008 27 0.900 0.375 0.900 0.500 0.333 0.512 13.0 33/64