ISO Trapezoidal screw threads Tr - FMS

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

3.11 2007/1 Page 2 - 4 Nominal pitch diameters Nominal diameter Pitch P Pitch diameter column d 2 = D 2 column 1 column 2 3 8 1,5 7,250 10 9 651,5 2 8,250 8,000 57,000

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  Screw, Thread, Pitch, Diameters, Trapezoidal, Iso trapezoidal screw threads tr, Pitch diameter

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