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Trapezoidal Screw Threads

Relevant Standards

BS 5346:1976 Specification for ISO metric trapezoidal screw threads
<> ISO 2901:1977 ISO metric trapezoidal screw threads -- Basic profile and maximum material profiles
ISO 2902:1977 ISO metric trapezoidal screw threads -- General plan
ISO 2903:1977 ISO metric trapezoidal screw threads -- Tolerances
ISO 2904:1977 ISO metric trapezoidal screw threads -- Basic dimensions
Din 103-4 ISO Metric Trapezoidal Screw Thread; Nominal Dimensions

Trapezoidal Thread form to ISO 2904 ........Table of Threads to DIN 103-4



Thread Proportions
H1 = 0,5p H4 = H1 + ac h3 = H1 + ac
D4 = d + 2ac Z = H1 /2 D1 = d - 2H1 = d - p
d3 = D - 2h3 d2 = D2= d - 2Z = d - 0,5p R1max= 0,5 ac  R2max= ac


ac = ( D4 - d ) /2



Table of trapezoidal screw threads are in accordance with ISO 2904:1977

All dimensions in milli metres

d P d2 =D2 D4 d3 D1 d P d2 =D2 D4 d3 D1
mm mm mm mm mm mm mm mm mm mm mm mm
8 1,5 7,250 8,300 6,200 6,500      42 3 40,500 42,500 38,500 39,000
     9 1,5 8,250 9,300 7,200 7,500      42 7 38,500 43,000 34,000 35,000
     9 2 8,000 9,500 9.250 7,000      42 10 37,000 43,000 41,000 32,000
10 1,5 9,250 11,000 2,000 3,000 44 3 42,500 44,500 40,500 41,000
10 2 9,000 10,500 7,500 8,000 44 7 40,500 45,000 36,000 37,000
     11 2 10,000 11,500 8,500 9,000 44 12 38,000 45,000 31,000 32,000
     11 3 9,500 11,500 7,500 8,000      46 3 44,500 46,500 42,500 43,000
12 2 11,000 12,500 9,500 10,000      46 8 42,000 47,000 37,000 38,000
12 3 10,500 12,500 8,500 9,000      46 12 40,000 47,000 33,000 34,000
     14 2 13,000 14,500 11,500 12,000 48 3 46,500 48,500 44,500 45,000
     14 3 12,500 14,500 10,500 11,000 48 8 44,000 49,000 39,000 40,000
16 2 15,000 16,500 13,500 14,000 48 12 42,000 49,000 35,000 36,000
16 3 14,500 16,500 12,500 13,000      50 3 48,500 50,500 46,500 47,000
     18 2 17,000 18,500 15,500 16,000      50 8 46,000 51,000 41,000 42,000
     18 4 16,000 18,500 13,500 14,000      50 12 44,000 51,000 37,000 38,000
20 2 19,000 20,500 17,500 18,000 52 3 50,500 52,500 48,500 49,000
20 4 18,000 20,500 15,500 16,000 52 8 48,000 53,000 43,000 44,000
     22 3 20,500 22,500 18,500 19,000 52 12 46,000 53,000 39,000 40,000
     22 5 19,500 22,500 16,500 17,000      55 3 53,500 55,500 51,500 52,000
     22 8 18,000 23,000 13,000 14,000      55 9 50,500 56,000 45,000 46,000
24 3 22,500 24,500 20,500 21,000      55 14 48,000 57,000 39,000 41,000
24 5 21,500 24,500 18,500 19,000 60 3 58,500 60,500 56,500 57,000
24 8 20,000 25,000 15,000 16,000 60 9 55,500 61,000 50,000 51,000
     26 3 24,500 26,500 22,500 23,000 60 14 53,000 62,000 44,000 46,000
     26 5 23,500 26,500 20,500 21,000      65 4 63,000 65,500 60,500 61,000
     26 8 22,000 27,000 17,000 18,000      65 10 60,000 66,000 54,000 55,000
28 3 26,500 28,500 24,500 25,000      65 16 57,000 67,000 47,000 49,000
28 5 25,500 28,500 22,500 23,000 70 4 68,000 70,500 65,500 66,000
     28 8 24,000 29,000 19,000 20,000 70 10 65,000 71,000 59,000 60,000
     30 3 28,500 30,500 26,500 27,000 70 16 62,000 72,000 52,000 54,000
     30 6 27,000 30,500 23,000 24,000      75 4 73,000 75,500 70,500 71,000
30 10 25,000 31,000 19,000 20,000      75 10 70,000 76,000 64,000 65,000
32 3 30,500 32,500 28,500 29,000      75 16 67,000 77,000 57,000 59,000
32 6 29,000 32,500 25,000 26,000 80 4 78,000 80,500 75,500 76,000
32 10 27,000 33,000 21,000 22,000 80 10 75,000 81,000 69,000 70,000
     34 3 32,500 34,500 30,500 31,000 80 16 72,000 82,000 62,000 64,000
     34 6 31,000 34,500 27,000 28,000      85 4 83,000 85,500 80,500 81,000
     34 10 29,000 35,000 23,000 24,000      85 12 79,000 86,000 72,000 73,000
36 3 34,500 36,500 32,500 33,000      85 18 76,000 87,000 65,000 67,000
36 6 33,000 36,500 29,000 30,000      95 4 93,000 95,500 90,500 91,000
36 10 31,000 37,000 25,000 26,000      95 12 89,000 96,000 82,000 83,000
     38 3 36,500 38,500 34,500 35,000      95 18 86,000 97,000 75,000 77,000
     38 7 34,500 39,000 30,000 31,000 100 4 98,000 100,500 95,500 96,000
     38 10 33,000 39,000 27,000 28,000 100 12 94,000 101,000 87,000 88,000
40 3 38,500 40,500 36,500 37,000 100 20 90,000 102,000 78,000 80,000
40 7 36,500 41,000 32,000 33,000
40 10 35,000 41,000 29,000 30,000




Trapezoidal Thread form to Din 103-4



Table of trapezoidal thread dimensions to DIN 103-4

Ds P E he a b Ks hs Dn Kn hn
mm
10 3 8,5 1,25 0,25 0,5 6,5 1,75 10,5 7,5 1,5
12 3 10,5 1,25 0,25 0,5 8,5 1,75 12,5 9,5 1,5
14 4 12 1,75 0,25 0,5 9,5 2,25 14,5 10,5 2
16 4 14 1,75 0,25 0,5 11,5 2,25 16,5 12,5 2
18 4 16 1,75 0,25 0,5 13,5 2,25 18,5 14,5 2
20 4 18 1,75 0,25 0,5 15,5 2,25 20,5 16,5 2
22 5 19,5 2 0,25 0,75 16,5 2,25 22,5 18 2
24 5 21,5 2 0,25 0,75 18,5 2,25 24,5 20 2,25
26 5 23,5 2 0,25 0,75 20,5 2,25 26,5 22 2,25
28 5 25,5 2 0,25 0,75 22,5 2,25 28,5 24 2,25
30 6 27 2,5 0,25 0,75 23,5 3,25 30,5 25 2,75
32 6 29 2,5 0,25 0,75 25,5 3,25 32,5 27 2,75
36 6 33 2,5 0,25 0,75 29,5 3,25 36,5 31 2,75
40 7 36,5 3 0,25 0,75 32,5 3,75 40,5 34 3,25
44 7 40,5 3 0,25 0,75 36,5 3,75 44,5 38 3,25
48 8 44 3,5 0,25 0,75 39,5 4,25 48,5 41 3,75
50 8 46 3,5 0,25 0,75 41,5 4,25 50,5 43 3,75
52 8 48 3,5 0,25 0,75 43,5 4,25 52,5 45 3,75
55 9 50,5 4 0,25 0,75 45,5 4,75 55,5 47 4,25
60 9 55,5 4 0,25 0,75 50,5 4,75 60,5 52 4,25
65 10 60 4,5 0,25 0,75 54,5 5,25 65,5 56 4,75
70 10 65 4,5 0,25 0,75 59,5 5,25 70,5 61 4,75
75 10 70 4,5 0,25 0,75 64,5 5,25 75,5 66 4,75
80 10 75 4,5 0,25 0,75 69,5 5,25 80,5 71 4,75
85 12 79 5,5 0,25 0,75 72,5 6,25 85,5 74 5,75
90 12 84 5,5 0,25 0,75 77,5 6,25 90,5 79 5,75
95 12 89 5,5 0,25 0,75 82,5 6,25 95,5 84 5,75
100 12 94 5,5 0,25 0,75 87,5 6,25 100,5 89 5,75



Useful Links
  1. roton..Information on Trapezoidal Lead screws
  2. getotec..Manufacturers technical brochure

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Last Updated 24/01/2013