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Thread identification major diameters from 0.3mm to 7.723 mm***Schroefdraadherkenning voor buitendiameters van 0.3mm tot 7.723mm
BASIC MAJOR DIAMETER NOMINAL DIAMETER: METRIC STD. REF. METRIC -- PITCH in mm NOMINAL DIAMETER: AMERICAN AMERICAN -- PITCH in THREADS per Inch NOMINAL DIAMETER: BRITISH BRITISH -- PITCH in THREADS per Inch
Inch mm mm . COARSE FINE . UNC UNF UNEF UNM BA BSW BSF BSPT
0.0118 0.3 0.3 D 0.075 . . . . . . . . . .
0.0118 0.3 0.3 I 0.08 . .30mm . . 318 . . . . .
0.0138 0.35 0.35 II 0.09 . .35mm . . 282 . . . . .
0.0146 0.37 . . . . . . . . 22 254 . . .
0.0157 0.4 0.4 I D 0.1 . .40mm . . 254 . . . . .
0.0165 0.42 . . . . . . . . 21 230.91 . . .
0.0177 0.45 0.45 II 0.1 . .45mm . . 254 . . . . .
0.0189 0.48 . . . . . . . . 20 211.67 . . .
0.0197 0.5 0.5 I D 0.125 . .50mm . . 203 . . . . .
0.0209 0.53 . . . . 0 . 160 . . . . . .
0.0213 0.54 . . . . . . . . 19 181.43 . . .
0.0217 0.55 0.55 II 0.125 . .55mm . . 203 . . . . .
0.0236 0.6 0.6 I D 0.15 . .60mm . . 169 . . . . .
0.0244 0.62 . . . . . . . . 18 169.33 . . .
0.0276 0.7 0.7 II D 0.175 . .70mm . . 145 17 149.41 . . .
0.0311 0.79 . . . . . . . . 16 133.68 . . .
0.0315 0.8 0.8 I D 0.2 . .80mm . . 127 . . . . .
0.0340 0.86 . . . . 0 . 120 . . . . . .
0.0354 0.9 0.9 II D 0.225 . .90mm . . 113 15 120.95 . . .
0.0394 1 1 I D 0.25 0.2 1.00mm . . 102 14 110.44 . . .
0.0433 1.1 1.1 II 0.25 0.2 1.10mm . . 102 . . . . .
0.0470 1.19 . . . . 0 . 90 . . . . . .
0.0472 1.2 1.2 I D 0.25 0.2 1.20mm . . 102 13 101.6 . . .
0.0512 1.3 . . . . . . . . 12 90.71 . . .
0.0551 1.4 1.4 II D 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 I 0.35 0.2 . . . . . . . . .
0.0669 1.7 1.7 D 0.35 0.2,0.25 . . . . 10 72.57 . . .
0.0709 1.8 1.8 II 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 I D 0.4 0.25,0.3 . . . . . . . . .
0.0860 2.184 . . . . #2 56 64 . . . . . .
0.0866 2.2 2.2 II 0.45 0.25 . . . . 8 59.07 . . .
0.0906 2.3 2.3 D 0.4 0.25,0.35 . . . . . . . . .
0.0937 2.38 . . . . . . . . 3/32 . (48) . .
0.0984 2.5 2.5 I 0.45 0.35 . . . . 7 52.92 . . .
0.0990 2.515 . . . . #3 48 56 . . . . . .
0.1024 2.6 2.6 D 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 I D 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 II D 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 I D 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 II 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 I D 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 III 0.9 0.5 . . . . . . . . .
0.2188 5.556 . . . . . . . . 7/32 . (24) 28 .
0.2362 6 6 I D 1 0.5,0.75 . . . . 0 25.4 . . .
0.2480 6.3 6.3 GM 1 . . . . . 1/8 . . . 28(H)
0.2500 6.35 . . . . 1/4 20 28 32 1/4 . 20 26 .
0.2756 7 7 III D 1 0.5,0.75 . . . . . . . . .
0.2812 7.144 . . . . . . . . 9/32 . (20) 26 .
0.3041 7.723 . . . . . . . . 1/16 . . . 28

  1. The British thread system is fractionally based, but all thread V-angles are different than the American fractionally or decimally based threads. Most thread per inch values are different than in the American System.
  2. Taper pipe thread major diameters are measured at the gauge point.
  3. (H)= BSPT copper pipe thread.
  4. Dimensions within ( ) in the M FINE column are obsolete French or Japanese threads.
  5. Dimensions within ( ) in the BSW column are obsolete British coarse threads.
  6. The 6.3 mm dimension; marked GM is an obsolete General Motors thread.