ISO Trapezoidal screw threads Tr - FMS

1 2007/1 Page 1 - 4 ISO Trapezoidal screw threads Tr NOMINAL pitch DIAMETER d2 & D2 d2/D2 = d/D PDn (PDn = ) EXTERNAL thread d = major diameter d2 = pitch diameter d1 = Minor diameter INTERNAL thread D = Major diameter D2 = pitch diameter D1 = Minor diameter P = pitch = Flank angle 30O Ref.: ISO 2901 ISO metric Trapezoidal screw threads Basic profile and maximum material profiles. ISO 2902 ISO metric Trapezoidal screw threads general plan ISO 2903 ISO metric Trapezoidal screw threads Tolerances ISO 2904 ISO metric Trapezoidal screw threads basic dimensions These standards contain much more information than given here. diameters and pitch combinations Nominal diameter pitch P column 1 column 2 column 3 course normal fine 8 10 9 1,5 2 2 1,5 1,5 12 11 14 3 2 3 3 2 2 2 16 20 18 4 4 4 2 2 2 24 22 26 8 8 8 5 5 5 3 3 3 28 32 30 8 10 10 5 6 6 3 3 3 36 34 38 10 10 10 6 6 7 3 3 3 40 44 42 10 10 12 7 7 7 3 3 3 48 46 50 12 12 12 8 8 8 3 3 3 52 60 55 12 14 14 8 9 9 3 3 3 70 65 75 16 16 16 10 10 10 4 4 4 80 90 85 16 18 18 10 12 12 4 4 4 100 95 105 18 20 20 12 12 12 4 4 4 Nominal diameter pitch P column 1 column 2 column 3 course normal fine 120 110 115 20 22 22 12 14 14 4 6 6 130 125 135 22 22 24 14 14 14 6 6 6 140 150 145 24 24 24 14 14 16 6 6 6 160 155 165 24 28 28 16 16 16 6 6 6 180 170 175 28 28 28 16 16 18 6 8 8 190 185 195 32 32 32 18 18 18 8 8 8 200 220 210 32 36 36 18 20 20 8 8 8 240 230 250 36 36 40 20 22 22 8 8 12 260 280 270 40 40 40 22 24 24 12 12 12 300 290 44 44 24 24 12 12 diameters in column 1should have preference

2 Over column 2, and column 2 should have preference over column 3. diameters from column 3 should be avoided in new designs. Normal pitch should be chosen when possible. 2007/1 Page 2 - 4 Nominal pitch diameters Nominal diameter pitch P pitch diameter d2 = D2 column 1 column 2 column 3 8 1,5 7,250 9 1,5 2 8,250 8,000 10 2 3 9,250 9,000 11 2 3 10,000 9,500 12 2 3 11,000 10,500 14 2 4 13,000 12,500 16 2 4 15,000 16,000 18 2 4 17,000 16,000 20 2 4 19,000 18,000 22 3 5 8 20,500 19,500 18,000 24 3 5 8 22,500 21,500 20,000 26 3 5 8 24,500 23,500 22,000 28 3 6 10 26,500 25,500 24,000 30 3 6 10 28,500 27,500 25,000 32 3 6 10 30,500 29,000 27,000 34 3 6 10 32,500 31,000 29,000 36 3 6 10 34,500 33,000 31,000 38 3 7 10 36,500 34,500 33,000 40 3 7 10 38,500 36,500 35,000 42 3 7 10 40,500 38,500 37,000 44 3 7 12 42,500 40,500 38,000 46 3 8 12 44,500 42,000 40,000 48 3 8 12 46,500 44,000 42,000 50 3 8 12 48,500 46,000 44,000 52 3 8 12 50,500 48,000 46.

3 000 55 3 9 14 53,500 50,500 48,000 60 3 9 14 58,500 55,500 53,000 Nominal diameter pitch P pitch diameter d2 = D2 column 1 column 2 column 3 65 4 10 16 63,000 60,000 57,000 70 4 10 16 68,000 65,000 62,000 75 4 10 16 73,000 70,000 67,000 80 4 10 16 78,000 75,000 72,000 85 4 12 18 83,000 79,000 76,000 90 4 12 18 88,000 84,000 81,000 95 4 12 18 93,000 89,000 86,000 100 4 12 20 98,000 94,000 90,000 105 4 12 20 103,000 99,000 95,000 110 4 12 20 108,000 104,000 100,000 115 6 12 22 112,000 108,000 104,000 120 6 12 22 117,000 113,000 109,000 125 6 14 22 122,000 118,000 114,000 130 6 14 22 127,000 123,000 119,000 135 6 14 24 132,000 128,000 123,000 140 6 14 24 137,000 133,000 128,000 145 6 14 24 142,000 138,000 133,000 150 6 16 24 147,000 142,000 138,000 155 6 16 24 152,000 147,000 143,000 160 6 16 28 157,000 152,000 146,000 165 6 16 28 162,000 157,000 151,000 170 6 16 28 167,000 162,000 156,000 175 6 16 28 171,000 167,000 161,000 180 8 18 28 176,000 171,000 166,000 2007/1 Page 3 - 4 Nominal diameter pitch P pitch diameter d2 = D2 column 1 column 2 column 3 185 8 18 32 181,000 176,000 169,000 190 8 18 32 186,000 181,000 174,000 195 8 18 32 191,000 186,000 179,000 200 8 18 32 196,000 191,000 184,000 210 8 20 36 206,000 200,000 192,000 220 8 20 36 216,000 210,000 202,000 230 8 20 36 226,000 220,000 212,000 Nominal diameter pitch P pitch diameter d2 = D2 column 1 column 2 column 3 240 8 22 36 236,000 229,000 222,000 250 12 22 40 244,000 239,000 230,000 260 12 22 40 254,000 249,000 240,000 270 12 24 40 264,000 258,000 250,000 280 12 22 40 274,000 268,000 260,000 290 12 22 44 284,000 278,000 268.

4 000 300 12 22 44 294,000 288,000 278,000 Basic allowance for pitch diameters for internal (Nut) and external (Bolt) threads pitch P Basic allowance NUT BOLT Internal thread D2 External thread d2 c e 1,5 2 3 4 5 6 7 8 9 10 12 14 16 18 20 22 24 26 32 36 40 44 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 - 0,140 - 0,150 - 0,170 - 0,190 - 0,212 - 0,236 - 0,250 - 0,265 - 0,280 - 0,300 - 0,335 - 0,355 - 0,375 - 0,400 - 0,425 - 0,450 - 0,475 - 0,500 - 0,530 - 0,560 - 0,600 -0,630 - 0,067 - 0,071 - 0,085 - 0,095 - 0,106 - 0,118 - 0,125 - 0,132 - 0,140 - 0,150 - 0,160 - 0,180 - 0,190 - 0,200 - 0,212 - 0,224 - 0,236 - 0,250 - 0,265 - 0,280 - 0,300 -0,315 2007/1 Page 4 - 4 ToleranceS for pitch diameter Nominal diameter mm pitch P Tolerance class Internal thread Tolerance class External thread above Up to 7 8 9 6 7 8 9 5,6 11,2 1,5 2 3 0,224 0.

5 250 0,280 0,280 0,315 0,355 0,355 0,400 0,450 0,132 0,150 0,170 0,170 0,190 0,212 0,212 0,236 0,265 0,265 0,300 0,335 11,2 22,4 2 3 4 0,265 0,300 0,355 0,355 0,375 0,450 0,425 0,475 0,560 0,160 0,180 0,212 0,200 0,224 0,265 0,250 0,280 0,335 0,315 0,355 0,425 5 8 0,375 0,475 0,475 0,600 0,600 0,750 0,224 0,280 0,280 0,355 0,355 0,450 0,450 0,560 22,4 45 3 5 6 0,335 0,400 0,450 0,425 0,500 0,560 0,530 0,630 0,710 0,200 0,236 0,265 0,250 0,300 0,335 0,315 0,375 0,425 0,400 0,475 0,530 7 8 10 12 0,475 0,500 0,530 0,560 0,600 0,630 0,670 0,710 0,750 0,800 0,850 0,900 0,280 0,300 0,315 0,335 0,355 0,375 0,400 0,425 0,450 0,475 0,500 0,530 0,560 0,600 0,630 0,670 45 90 3 4 8 0,355 0,400 0,530 0,450 0,500 0,670 0,560 0,630 0,850 0,212 0,236 0,315 0,265 0,300 0,400 0,335 0,375 0,500 0,425 0,475 0,630 9 10 12 0,560 0,560 0,630 0,710 0,710 0,800 0,900 0,900 1,000 0,335 0,335 0,375 0,425 0,425 0,475 0,530 0,530 0,600 0,670 0,670 0,750 14 16 18 0,670 0,710 0,750 0,850 0,900 0,950 1,060 1,120 1,180 0,400 0,425 0,450 0,500 0,530 0,560 0,630 0,670 0,710 0,800 0,850 0,900 90 180 4 6 8 12 0,425 0,500 0,560 0,670 0,530 0,630 0,710 0,850 0,670 0,800 0,900 1,060 0,250 0,300 0,335 0,400 0,315 0,375 0,425 0,500 0,400 0,475 0,530 0,630 0,500 0,600 0,670 0,800 14 16 18 0,710 0,750 0,800 0,900 0,950 1,000 1,120 1,180 1,250 0,425 0,450 0,475 0,530 0,560 0,600 0,670 0,710 0,750 0,850 0,900 0,950 20 22 24 28 0,800 0,850 0,900 0,950 1,000 1,060 1,120 1,180 1,250 1,320 1,400 1,500 0,475 0,500 0,530 0,560 0,600 0,630 0,670 0,710 0,750 0,800 0,850 0,900 0,950 1,000 1,060 1,120 180 355 8 12 18 0,600 0,710 0,850 0,750 0,900 1,060 0,950 1,120 1,320 0,355 0,425 0,500 0,450 0,530 0,630 0,560 0,670 0,800 0,710 0,850 1.

6 000 20 22 24 0,900 0,900 0,950 1,120 1,120 1,180 1,400 1,400 1,500 0,530 0,530 0,560 0,670 0,670 0,710 0,850 0,850 0,900 1,060 1,060 1,120 32 36 40 44 1,060 1,120 1,120 1,250 1,320 1,400 1,400 1,500 1,700 1,800 1,800 1,900 0,630 0,670 0,670 0,710 0,800 0,850 0,850 0,900 1,000 1,060 1,060 1,120 1,250 1,320 1,320 1,400 Examples Denomination Nut pitch diameter D2 Tolerance max min Tr 40 x 7 7H 36,500 - 0 / + 0,475 36,975 36,500 Denomination Bolt pitch diameter d2 Tolerance max min Tr 40 x 7 7e 36,500 - 0,125 / - 0,480 36,375 36,020