Thread Identification Chart (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 |
*All information is strictly informative
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