BASIC MAJOR DIAMETER | NOMINAL DIAMETER: METRIC |
METRIC -- PITCH in mm | NOMINAL DIAMETER: AMERICAN |
AMERICAN --
PITCH in THREADS per Inch |
NOMINAL DIAMETER: BRITISH |
BRITISH --
PITCH in THREADS per Inch |
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Inch | mm | mm | COARSE | FINE | . | UNC | UNF | UNEF | UNM | BA | BSW | BSF | BSPT | |
0.0118 | 0.3 | 0.3 | 0.075 | . | . | . | . | . | . | . | . | . | . | |
0.0118 | 0.3 | 0.3 | 0.08 | . | .30mm | . | . | 318 | . | . | . | . | . | |
0.0138 | 0.35 | 0.35 | 0.09 | . | .35mm | . | . | 282 | . | . | . | . | . | |
0.0146 | 0.37 | . | . | . | . | . | . | . | 22 | 254 | . | . | . | |
0.0157 | 0.4 | 0.4 | 0.1 | . | .40mm | . | . | 254 | . | . | . | . | . | |
0.0165 | 0.42 | . | . | . | . | . | . | . | 21 | 230.91 | . | . | . | |
0.0177 | 0.45 | 0.45 | 0.1 | . | .45mm | . | . | 254 | . | . | . | . | . | |
0.0189 | 0.48 | . | . | . | . | . | . | . | 20 | 211.67 | . | . | . | |
0.0197 | 0.5 | 0.5 | 0.125 | . | .50mm | . | . | 203 | . | . | . | . | . | |
0.0209 | 0.53 | . | . | . | 0 | . | 160 | . | . | . | . | . | . | |
0.0213 | 0.54 | . | . | . | . | . | . | . | 19 | 181.43 | . | . | . | |
0.0217 | 0.55 | 0.55 | 0.125 | . | .55mm | . | . | 203 | . | . | . | . | . | |
0.0236 | 0.6 | 0.6 | 0.15 | . | .60mm | . | . | 169 | . | . | . | . | . | |
0.0244 | 0.62 | . | . | . | . | . | . | . | 18 | 169.33 | . | . | . | |
0.0276 | 0.7 | 0.7 | 0.175 | . | .70mm | . | . | 145 | 17 | 149.41 | . | . | . | |
0.0311 | 0.79 | . | . | . | . | . | . | . | 16 | 133.68 | . | . | . | |
0.0315 | 0.8 | 0.8 | 0.2 | . | .80mm | . | . | 127 | . | . | . | . | . | |
0.0340 | 0.86 | . | . | . | 0 | . | 120 | . | . | . | . | . | . | |
0.0354 | 0.9 | 0.9 | 0.225 | . | .90mm | . | . | 113 | 15 | 120.95 | . | . | . | |
0.0394 | 1 | 1 | 0.25 | 0.2 | 1.00mm | . | . | 102 | 14 | 110.44 | . | . | . | |
0.0433 | 1.1 | 1.1 | 0.25 | 0.2 | 1.10mm | . | . | 102 | . | . | . | . | . | |
0.0470 | 1.19 | . | . | . | 0 | . | 90 | . | . | . | . | . | . | |
0.0472 | 1.2 | 1.2 | 0.25 | 0.2 | 1.20mm | . | . | 102 | 13 | 101.6 | . | . | . | |
0.0512 | 1.3 | . | . | . | . | . | . | . | 12 | 90.71 | . | . | . | |
0.0551 | 1.4 | 1.4 | 0.3 | 0.2 | 1.40mm | . | . | 85 | . | . | . | . | . | |
0.0591 | 1.5 | 1.5 | 0.3 | . | . | . | . | . | 11 | 81.93 | . | . | . | |
0.0600 | 1.524 | . | . | . | #0 | . | 80 | . | . | . | . | . | . | |
0.0625 | 1.59 | . | . | . | . | . | . | . | 1/16 | . | (60) | . | . | |
0.0629 | 1.6 | 1.6 | 0.35 | 0.2 | . | . | . | . | . | . | . | . | . | |
0.0669 | 1.7 | 1.7 | 0.35 | 0.2,0.25 | . | . | . | . | 10 | 72.57 | . | . | . | |
0.0709 | 1.8 | 1.8 | 0.35 | 0.2,(0.4) | . | . | . | . | . | . | . | . | . | |
0.0730 | 1.854 | . | . | . | #1 | 64 | 72 | . | . | . | . | . | . | |
0.0748 | 1.9 | . | . | . | . | . | . | . | 9 | 65.13 | . | . | . | |
0.0781 | 1.98 | . | . | . | . | . | . | . | 5/64 | . | (56) | . | . | |
0.0787 | 2 | 2 | 0.4 | 0.25,0.3 | . | . | . | . | . | . | . | . | . | |
0.0860 | 2.184 | . | . | . | #2 | 56 | 64 | . | . | . | . | . | . | |
0.0866 | 2.2 | 2.2 | 0.45 | 0.25 | . | . | . | . | 8 | 59.07 | . | . | . | |
0.0906 | 2.3 | 2.3 | 0.4 | 0.25,0.35 | . | . | . | . | . | . | . | . | . | |
0.0937 | 2.38 | . | . | . | . | . | . | . | 3/32 | . | (48) | . | . | |
0.0984 | 2.5 | 2.5 | 0.45 | 0.35 | . | . | . | . | 7 | 52.92 | . | . | . | |
0.0990 | 2.515 | . | . | . | #3 | 48 | 56 | . | . | . | . | . | . | |
0.1024 | 2.6 | 2.6 | 0.45 | 0.25,0.35 | . | . | . | . | . | . | . | . | . | |
0.1094 | 2.78 | . | . | . | . | . | . | . | 7/64 | . | (48) | . | . | |
0.1102 | 2.8 | . | . | . | . | . | . | . | 6 | 47.93 | . | . | . | |
0.1120 | 2.845 | . | . | . | #4 | 40 | 48 | . | . | . | . | . | . | |
0.1181 | 3 | 3 | 0.5 | 0.35,(0.6) | . | . | . | . | . | . | . | . | . | |
0.1250 | 3.175 | . | . | . | #5 | 40 | 44 | . | 1/8 | . | 40 | . | . | |
0.1260 | 3.2 | . | . | . | . | . | . | . | 5 | 43.05 | . | . | . | |
0.1380 | 3.5 | 3.5 | 0.6 | 0.35,0.5 | #6 | 32 | 40 | . | . | . | . | . | . | |
0.1417 | 3.6 | . | . | . | . | . | . | . | 4 | 38.49 | . | . | . | |
0.1563 | 3.969 | . | . | . | . | . | . | . | 5/32 | . | (32) | . | . | |
0.1575 | 4 | 4 | 0.7 | 0.5,(0.75) | . | . | . | . | . | . | . | . | . | |
0.1614 | 4.1 | . | . | . | . | . | . | . | 3 | 34.80 | . | . | . | |
0.1640 | 4.166 | . | . | . | #8 | 32 | 36 | . | . | . | . | . | . | |
0.1772 | 4.5 | 4.5 | 0.75 | 0.5 | . | . | . | . | . | . | . | . | . | |
0.1850 | 4.7 | . | . | . | . | . | . | . | 2 | 31.36 | . | . | . | |
0.1875 | 4.762 | . | . | . | . | . | . | . | 3/16 | . | 24 | 32 | . | |
0.1900 | 4.826 | . | . | . | #10 | 24 | 32 | . | . | . | . | . | . | |
0.1969 | 5 | 5 | 0.8 | 0.5,0.75,(0.9) | . | . | . | . | . | . | . | . | . | |
0.2087 | 5.3 | . | . | . | . | . | . | . | 1 | 28.22 | . | . | . | |
0.2160 | 5.486 | . | . | . | #12 | 24 | 28 | 32 | . | . | . | . | . | |
0.2165 | 5.5 | 5.5 | 0.9 | 0.5 | . | . | . | . | . | . | . | . | . | |
0.2188 | 5.556 | . | . | . | . | . | . | . | 7/32 | . | (24) | 28 | . | |
0.2362 | 6 | 6 | 1 | 0.5,0.75 | . | . | . | . | 0 | 25.4 | . | . | . | |
0.2480 | 6.3 | 6.3 | 1 | . | . | . | . | . | 1/8 | . | . | . | 28(H) | |
0.2500 | 6.35 | . | . | . | 1/4 | 20 | 28 | 32 | 1/4 | . | 20 | 26 | . | |
0.2756 | 7 | 7 | 1 | 0.5,0.75 | . | . | . | . | . | . | . | . | . | |
0.2812 | 7.144 | . | . | . | . | . | . | . | 9/32 | . | (20) | 26 | . | |
0.3041 | 7.723 | . | . | . | . |
. | . | . | 1/16 | . | . | . | 28 |
BASIC MAJOR DIAMETER | NOMINAL DIAMETER: METRIC |
METRIC - PITCH in mm | NOMINAL DIAMETER: AMERICAN |
AMERICAN -- PITCH in THREADS per Inch | NOMINAL DIAMETER: BRITISH |
BRITISH --
PITCH in THREADS per Inch |
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Inch | mm | mm | COARSE | FINE | M TAPER | FRACTIONS | UNC | UNF | UNEF | NPT | 8UN | FRACTIONS | BSW | BSF | BSPF | BSPT |
0.3108 | 7.894 | . | . | . | . | 1/16 | . | . | . | 27 | . | . | . | BSPP | . | . |
0.3125 | 7.94 | . | . | . | . | 5/16 | 18 | 24 | 32 | . | . | 5/16 | 18 | 22 | . | . |
0.3150 | 8 | 8 | 1.25 | 0.5,0.75,1 | 1 | . | . | . | . | . | . | . | . | . | . | . |
0.3543 | 9 | 9 | 1.25 | 0.75,1 | . | . | . | . | . | . | . | . | . | . | . | . |
0.3750 | 9.53 | . | . | . | . | 3/8 | 16 | 24 | 32 | . | . | 3/8 | 16 | 20 | . | . |
0.3830 | 9.73 | . | . | . | . | . | . | . | . | . | . | 1/8 | . | . | 28 | 28 |
0.3937 | 10 | 10 | 1.5 | 0.75,1,1.25 | 1 | . | . | . | . | . | . | . | . | . | . | . |
0.4044 | 10.271 | . | . | . | . | 1/8 | . | . | . | 27 | . | . | . | . | . | . |
0.4331 | 11 | 11 | 1.5 | 0.75,1,1.25 | . | . | . | . | . | . | . | . | . | . | . | . |
0.4375 | 11.11 | . | . | . | . | 7/16 | 14 | 20 | 28 | . | . | 7/16 | 14 | 18 | . | . |
0.4724 | 12 | 12 | 1.75 | 1,1.25,1.5 | 1.5 | . | . | . | . | . | . | . | . | . | . | . |
0.5000 | 12.7 | . | . | . | . | 1/2 | 13 | 20 | 28 | . | . | 1/2 | 12 | 16 | . | . |
0.5180 | 13.16 | . | . | . | . | . | . | . | . | . | . | 1/4 | . | . | 19 | 19 |
0.5343 | 13.571 | . | . | . | . | . | . | . | . | 18 | . | . | . | . | . | . |
0.5512 | 14 | 14 | 2 | 1,1.25,1.5 | . | . | . | . | . | . | . | . | . | . | . | . |
0.5625 | 14.29 | . | . | . | . | 9/16 | 12 | 18 | 24 | . | . | 9/16 | 12 | 16 | . | . |
0.5906 | 15 | 15 | . | 1,1.5 | . | . | . | . | . | . | . | . | . | . | . | . |
0.6250 | 15.88 | . | . | . | . | 5/8 | 11 | 18 | 24 | . | . | 5/8 | 11 | 14 | . | . |
0.6299 | 16 | 16 | 2 | 1,1.5 | 1.5 | . | . | . | . | . | . | . | . | . | . | . |
0.6560 | 16.662 | . | . | . | . | . | . | . | . | . | . | 3/8 | . | . | 19 | 19 |
0.6693 | 17 | 17 | . | 1,1.5 | . | . | . | . | . | . | . | . | . | . | . | . |
0.6714 | 17.054 | . | . | . | . | 3/8 | . | . | . | 18 | . | . | . | . | . | . |
0.6875 | 17.46 | . | . | . | . | 11/16 | . | . | 24 | . | . | 11/16 | 11 | 14 | . | . |
0.7087 | 18 | 18 | 2.5 | 1,1.5,2 | 1.5 | . | . | . | . | . | . | . | . | . | . | . |
0.7500 | 19.05 | . | . | . | . | 3/4 | 10 | 16 | 20 | . | . | 3/4 | 10 | 12 | . | . |
0.7874 | 20 | 20 | 2.5 | 1,1.5,2 | 1.5 | . | . | . | . | . | . | . | . | . | . | . |
0.8125 | 20.64 | . | . | . | . | 13/16 | . | . | 20 | . | . | 13/16 | (10) | 12 | . | . |
0.8250 | 20.955 | . | . | . | . | . | . | . | . | . | . | 1/2 | . | . | 14 | 14 |
0.8356 | 21.222 | . | . | . | . | 1/2 | . | . | . | 14 | . | . | . | . | . | . |
0.8661 | 22 | 22 | 2.5 | 1,1.5,2 | 1.5 | . | . | . | . | . | . | . | . | . | . | . |
0.8750 | 22.23 | . | . | . | . | 7/8 | 9 | 14 | 20 | . | . | 7/8 | 9 | 11 | . | . |
0.9020 | 22.911 | . | . | . | . | . | . | . | . | . | . | 5/8 | . | . | 14 | 14 |
0.9375 | 23.81 | . | . | . | . | 15/16 | . | . | 20 | . | . | 15/16 | (9) | . | . | . |
0.9449 | 24 | 24 | 3 | 1,1.5,2 | . | . | . | . | . | . | . | . | . | . | . | . |
0.9843 | 25 | 25 | . | 1,1.5,2 | . | . | . | . | . | . | . | . | . | . | . | . |
1.0000 | 25.4 | . | . | . | . | 1 | 8 | 12 | 20 | . | 8 | 1 | 8 | 10 | . | . |
1.0236 | 26 | 26 | . | 1.5 | 1.5 | . | . | . | . | . | . | . | . | . | . | . |
1.0410 | 26.441 | . | . | . | . | . | . | . | . | . | . | 3/4 | . | . | 14 | 14 |
1.0460 | 26.568 | . | . | . | . | 3/4 | . | . | . | 14 | . | . | . | . | . | . |
1.0625 | 26.99 | . | . | . | . | 1 1/16 | . | . | 18 | . | 8 | . | . | . | . | . |
1.0630 | 27 | 27 | 3 | 1,1.5,2 | . | . | . | . | . | . | . | . | . | . | . | . |
1.1024 | 28 | 28 | . | 1,1.5,2 | . | . | . | . | . | . | . | . | . | . | . | . |
1.1250 | 28.58 | . | . | . | . | 1 1/8 | 7 | 12 | 18 | . | 8 | 1 1/8 | 7 | 9 | . | . |
1.1811 | 30 | 30 | 3.5 | 1,1.5,2,3 | . | . | . | . | . | . | . | . | . | . | . | . |
1.1875 | 30.16 | . | . | . | . | 1 3/16 | . | . | 18 | . | 8 | . | . | . | . | . |
1.1890 | 30.2 | . | . | . | . | . | . | . | . | . | . | 7/8 | . | . | 14 | 14 |
1.2500 | 31.75 | . | . | . | . | 1 1/4 | 7 | 12 | 18 | . | 8 | 1 1/4 | 7 | 9 | . | . |
1.2598 | 32 | 32 | . | 1.5,2 | . | . | . | . | . | . | . | . | . | . | . | . |
1.2992 | 33 | 33 | 3.5 | 1.5,2,3 | . | . | . | . | . | . | . | . | . | . | . | . |
1.3328 | 33.228 | . | . | . | . | 1 | . | . | . | 11 1/2 | . | . | . | . | . | . |
1.3090 | 33.249 | . | . | . | . | . | . | . | . | . | . | 1 | . | . | 11 | 11 |
1.3125 | 33.34 | . | . | . | . | 1 5/16 | . | . | 18 | . | 8 | . | . | . | . | . |
1.3750 | 34.93 | . | . | . | . | 1 3/8 | 6 | 12 | 18 | . | 8 | 1 3/8 | (6) | 8 | . | . |
1.3780 | 35 | 35 | . | 1.5 | . | . | . | . | . | . | . | . | . | . | . | . |
1.4173 | 36 | 36 | 4 | 1.5,2,3 | . | . | . | . | . | . | . | . | . | . | . | . |
1.4375 | 36.51 | . | . | . | . | 1 7/16 | . | . | 18 | . | 8 | . | . | . | . | . |
1.4920 | 37.897 | . | . | . | . | . | . | . | . | . | . | 1 1/8 | . | . | 11 | . |
1.4961 | 38 | 38 | . | 1.5 | . | . | . | . | . | . | . | . | . | . | . | . |
1.5000 | 38.1 | . | . | . | . | 1 1/2 | 6 | 12 | 18 | . | 8 | 1 1/2 | 6 | 8 | . | . |
1.5354 | 39 | 39 | 4 | 1.5,2,3 | . | . | . | . | . | . | . | . | . | . | . | . |
1.5625 | 39.69 | . | . | . | . | 1 9/16 | . | . | 18 | . | 8 | . | . | . | . | . |
1.5748 | 40 | 40 | . | 1.5,2,3 | . | . | . | . | . | . | . | . | . | . | . | . |
1.6250 | 41.28 | . | . | . | . | 1 5/8 | . | . | 18 | . | 8 | 1 5/8 | (5) | 8 | . | . |
1.6500 | 41.91 | . | . | . | . | . | . | . | . | . | . | 1 1/4 | . | . | 11 | 11 |
1.6535 | 41.99 | 42 | 4.5 | 1.5,2,3,4 | . | . | . | . | . | . | . | . | . | . | . | . |
1.6600 | 42.16 | . | . | . | . | 1 1/4 | . | . | . | 11 1/2 | . | . | . | . | . | . |
1.6875 | 42.86 | . | . | . | . | 1 11/16 | . | . | 18 | . | 8 | . | . | . | . | . |
1.7450 | 44.323 | . | . | . | . | . | . | . | . | . | . | 1 3/8 | . | . | 11 | . |
1.7500 | 44.45 | . | 16 | . | . | 1 3/4 | 5 | . | 16 | . | 8 | 1 3/4 | 5 | 7 | . | . |
1.7717 | 45 | 45 | 4.5 | 1.5,2,3,4 | . | . | . | . | . | . | . | . | . | . | . | . |
1.8750 | 47.63 | . | . | . | . | 1 7/8 | . | . | . | . | 8 | 1 7/8 | (4 1/2) | . | . | . |
1.8820 | 47.802 | . | . | . | . | . | . | . | . | . | . | 1 1/2 | . | . | 11 | 11 |
1.8898 | 48 | 48 | 5 | 1.5,2,3,4 | . | . | . | . | . | . | . | . | . | . | . | . |
1.8919 | 48.054 | . | . | . | . | 1 1/2 | . | . | . | 11 1/2 | . | . | . | . | . | . |
1.9685 | 50 | 50 | . | 1.5,2,3 | . | . | . | . | . | . | . | . | . | . | . | . |
2.0000 | 50.8 | . | . | . | . | 2 | 4 1/2 | . | 16 | . | 8 | 2 | 4 1/2 | 7 | . | . |
2.0472 | 52 | 52 | 5 | 1.5,2,3,4 | . | . | . | . | . | . | . | . | . | . | . | . |
2.1654 | 55 | 55 | . | 1.5,2,3,4 | . | . | . | . | . | . | . | . | . | . | . | . |
2.2047 | 56 | 56 | 5.5 | 1.5,2,3,4 | . | . | . | . | . | . | . | . | . | . | . | . |
2.2500 | 57.15 | . | . | . | . | 2 1/4 | 4 1/2 | . | . | . | 8 | 2 1/4 | 4 | 6 | . | . |
2.2835 | 58 | 58 | . | 1.5,2,3,4 | . | . | . | . | . | . | . | . | . | . | . | . |
2.3470 | 59.613 | . | . | . | . | . | . | . | . | . | . | 2 | . | . | 11 | 11 |
2.3622 | 60 | 60 | 5.5 | 1.5,2,3,4 | . | . | . | . | . | . | . | . | . | . | . | . |
2.3658 | 60.094 | . | . | . | . | 2 | . | . | . | 11 1/2 | . | . | . | . | . | . |
2.4409 | 62 | 62 | . | 1.5,2,3,4 | . | . | . | . | . | . | . | . | . | . | . | . |
2.5000 | 63.5 | . | . | . | . | 2 1/2 | 4 | . | . | . | 8 | 2 1/2 | 4 | 6 | . | . |
2.5197 | 64 | 64 | 6 | 1.5,2,3,4 | . | . | . | . | . | . | . | . | . | . | . | . |