External ISO Metric Trapezoidal Screw Threads Table Chart Sizes TR320 - TR1120

ISO Metric Hardware Engineering Data
Fastener and Screw / Bolt Design, Formula and Calculations

Trapezoidal threads are typically pecision rolled screw profiles and often used for lead screws and is similar to the Acme thread form, except the thread angle is 30°. It is codified by DIN 103. Although metric screw threads are generally more prevalent worldwide than imperial threads, the Acme thread is very common worldwide, and may be more widely used than the trapezoidal metric thread.

Trapezoidal threads are defined as follows by ISO standards: ISO 2901, ISO 2901, ISO 2903, ISO 2904 and ISO 103. Gages ISO metric trapezoidal screw thread are defined in the DIN 103-9.

DIN 106

These dimensions are determined by the following formula:

H1 = 0,5P
h3 = H4 = H1 + ac = 0,5P + ac
z = 0,25 P = H1 / 2
d3 = d - 2 x h3 = d - 2(0,5P + ac)
d2 = D2 = d - 2z = d - 0,5P
D1 = d - 2H1 = d - P
D4 = d + 2ac
s = 0,267 95es
R1max. = 0,5 ac
R2max. = ac

D = major diameter of internal thread
d = major diameter of external thread (nominal diameter)
D2 = pitch drameter of Internal thread
d2 = pitch diameter of external thread
D1 = minor diameter of internal thread
P = Pitch
H = height of fundamental triangle
H1 = height of basic profile
ac = crest clearance
es = fundamental deviation on external threads

Trapezoidal threads are defined as follows by ISO standards:

TR 8 x 1.5

where Tr designates a trapezoidal thread, 8 is the nominal diameter in millimeters, and 1.5 is the pitch in millimeters. When there is no suffix it is a single start thread. If there is a suffix then the value after the multiplication sign is the lead and the value in the parentheses is the pitch. For example:

TR 60 x 18 (P9) LH would denoted two starts, as the lead divided by the pitch is two. The "LH" denotes a left hand thread.

ISO Thread Thread Designation
Pitch
External ISO Metric Trapezoidal Threads Size Chart
Tolerance Class
Major Dia
Pitch Dia
Minor Dia
Max
Min
Max
Min
Max
Min
TR320x5
5
7e
320.000
319.665
317.394
317.019
314.500
313.925
TR320x12
12
7e
320.000
319.400
313.830
313.300
307.000
306.177
TR320x24
24
7e
320.000
319.050
307.764
307.054
294.000
292.876
TR320x44
44
7e
320.000
318.600
297.685
296.785
275.000
273.560
TR330x5
5
7e
330.000
329.665
327.394
327.039
324.500
323.979
TR335x5
5
7e
335.000
334.665
332.394
332.039
329.500
328.979
TR340x5
5
7e
340.000
339.665
337.394
337.019
334.500
333.925
TR340x12
12
7e
340.000
339.400
333.830
333.300
327.000
326.177
TR340x24
24
7e
340.000
339.050
327.764
327.054
314.000
312.876
TR340x28
28
7e
340.000
338.940
325.750
325.000
310.000
308.813
TR340x44
44
7e
340.000
338.600
317.685
316.785
295.000
293.560
TR345x5
5
7e
345.000
344.665
342.394
342.039
339.500
338.979
TR350x5
5
7e
350.000
349.665
347.394
347.039
344.500
343.979
TR355x5
5
7e
355.000
354.665
352.394
352.039
349.500
348.979
TR360x5
5
7e
360.000
359.665
357.394
356.994
354.500
353.894
TR360x12
12
7e
360.000
359.400
353.830
353.270
347.000
346.130
TR360x24
24
7e
360.000
359.050
347.764
347.014
334.000
332.827
TR360x28
28
7e
360.000
358.940
345.750
344.950
330.000
328.750
TR360x44
44
7e
360.000
358.600
337.685
336.735
314.000
312.498
TR365x5
5
7e
365.000
364.665
362.394
361.994
359.500
358.894
TR370x5
5
7e
370.000
369.665
367.394
366.994
364.500
363.894
TR375x5
5
7e
375.000
374.665
372.394
371.994
369.500
368.894
TR385x5
5
7e
385.000
384.665
382.394
381.994
379.500
378.894
TR395x5
5
7e
395.000
394.665
392.394
391.994
389.500
388.894
TR400x5
5
7e
400.000
399.665
397.394
396.994
394.500
393.894
TR400x12
12
7e
400.000
399.400
393.830
393.270
387.000
386.130
TR400x24
24
7e
400.000
399.050
387.764
387.014
374.000
372.827
TR400x28
28
7e
400.000
398.940
385.750
384.950
370.000
368.750
TR400x32
32
7e
400.000
398.880
383.735
382.885
366.000
364.673
TR400x44
44
7e
400.000
398.600
377.685
376.735
354.000
352.498
TR410x5
5
7e
410.000
409.665
407.394
406.994
404.500
403.894
TR415x5
5
7e
415.000
414.665
412.394
411.994
409.500
408.894
TR420x5
5
7e
420.000
419.665
417.394
416.994
414.500
413.894
TR420x12
12
7e
420.000
419.400
413.830
413.270
407.000
406.130
TR420x24
24
7e
420.000
419.050
407.764
407.014
394.000
392.827
TR420x32
32
7e
420.000
418.880
403.735
402.885
386.000
384.673
TR420x44
44
7e
420.000
418.600
397.685
396.735
374.000
372.498
TR430x5
5
7e
430.000
429.665
427.394
426.994
424.500
423.894
TR435x5
5
7e
435.000
434.665
432.394
431.994
429.500
428.894
TR440x5
5
7e
440.000
439.665
437.394
436.994
434.500
433.894
TR440x12
12
7e
440.000
439.400
433.830
433.270
427.000
426.130
TR440x24
24
7e
440.000
439.050
427.764
427.014
414.000
412.827
TR440x32
32
7e
440.000
438.880
423.735
422.885
406.000
404.673
TR440x36
36
7e
440.000
438.750
421.720
420.820
402.000
400.595
TR440x44
44
7e
440.000
438.600
417.685
416.735
394.000
392.498
TR450x5
5
7e
450.000
449.665
447.394
446.994
444.500
443.894
TR460x5
5
7e
460.000
459.665
457.394
456.994
454.500
453.894
TR460x12
12
7e
460.000
459.400
453.830
453.270
447.000
446.130
TR460x24
24
7e
460.000
459.050
447.764
447.014
434.000
432.827
TR460x32
32
7e
460.000
458.880
443.735
442.885
426.000
424.673
TR460x36
36
7e
460.000
458.750
441.720
440.820
422.000
420.595
TR460x44
44
7e
460.000
458.600
437.685
436.735
414.000
412.498
TR470x5
5
7e
470.000
469.665
467.394
466.994
464.500
463.894
TR480x5
5
7e
480.000
479.665
477.394
476.994
474.500
473.894
TR480x12
12
7e
480.000
479.400
473.830
473.270
467.000
466.130
TR480x24
24
7e
480.000
479.050
467.764
467.014
454.000
452.827
TR480x36
36
7e
480.000
478.750
461.720
460.820
442.000
440.595
TR480x44
44
7e
480.000
478.600
457.685
456.735
434.000
432.498
TR490x5
5
7e
490.000
489.665
487.394
486.994
484.500
483.894
TR500x5
5
7e
500.000
499.665
497.394
496.994
494.500
493.894
TR500x12
12
7e
500.000
499.400
493.830
493.270
487.000
486.130
TR500x24
24
7e
500.000
499.050
487.764
487.014
474.000
472.827
TR500x36
36
7e
500.000
498.750
481.720
480.820
462.000
460.595
TR500x40
40
7e
500.000
498.680
479.700
478.800
458.000
456.575
TR500x44
44
7e
500.000
498.600
477.685
476.735
454.000
452.498
TR510x6
6
7e
510.000
509.625
506.882
506.482
503.000
502.394
TR520x6
6
7e
520.000
519.625
516.882
516.482
513.000
512.394
TR530x5
5
7e
530.000
529.665
527.394
526.994
524.500
523.894
TR530x6
6
7e
530.000
529.625
526.882
526.482
523.000
522.394
TR530x12
12
7e
530.000
529.400
523.830
523.270
517.000
516.130
TR530x24
24
7e
530.000
529.050
517.764
517.014
504.000
502.827
TR530x40
40
7e
530.000
528.680
509.700
508.800
488.000
486.575
TR530x44
44
7e
530.000
528.600
507.685
506.735
484.000
482.498
TR540x6
6
7e
540.000
539.625
536.882
536.482
533.000
532.394
TR550x6
6
7e
550.000
549.625
546.882
546.482
543.000
542.394
TR560x5
5
7e
560.000
559.665
557.394
556.994
554.500
553.894
TR560x12
12
7e
560.000
559.400
553.830
553.270
547.000
546.130
TR560x24
24
7e
560.000
559.050
547.764
547.014
534.000
532.827
TR560x40
40
7e
560.000
558.680
539.700
538.800
518.000
516.575
TR560x44
44
7e
560.000
558.600
537.685
536.735
514.000
512.497
TR560x45
45
7e
560.000
558.600
537.185
536.235
513.000
511.497
TR600x6
6
7e
600.000
599.625
596.882
596.457
593.000
592.351
TR600x12
12
7e
600.000
599.400
593.830
593.270
587.000
586.130
TR600x24
24
7e
600.000
599.050
587.764
587.014
574.000
572.827
TR600x40
40
7e
600.000
598.680
579.700
578.800
558.000
556.575
TR600x44
44
7e
600.000
598.600
577.685
576.735
554.000
552.498
TR600x45
45
7e
600.000
598.600
577.185
576.235
553.000
551.497
TR630x6
6
7e
630.000
629.625
626.882
626.457
623.000
622.351
TR630x12
12
7e
630.000
629.400
623.830
623.270
617.000
616.130
TR630x24
24
7e
630.000
629.050
617.764
617.014
604.000
602.827
TR630x44
44
7e
630.000
628.600
607.685
606.735
584.000
582.498
TR630x45
45
7e
630.000
628.600
607.185
606.235
583.000
581.497
TR670x6
6
7e
670.000
669.625
666.882
666.457
663.000
662.351
TR670x12
12
7e
670.000
669.400
663.830
663.270
657.000
656.130
TR670x24
24
7e
670.000
669.050
657.764
657.014
644.000
642.827
TR670x44
44
7e
670.000
668.600
647.685
646.735
624.000
622.498
TR670x45
45
7e
670.000
668.600
647.185
646.235
623.000
621.497
TR710x7
7
7e
710.000
709.575
706.375
705.925
702.000
701.313
TR710x12
12
7e
710.000
709.400
703.830
703.270
697.000
696.130
TR710x24
24
7e
710.000
709.050
697.764
697.014
684.000
682.827
TR710x44
44
7e
710.000
708.600
687.685
686.735
664.000
662.498
TR710x50
50
7e
710.000
708.550
684.680
683.680
658.000
656.430
TR750x7
7
7e
750.000
749.575
746.375
745.900
742.000
741.281
TR750x12
12
7e
750.000
749.400
743.830
743.200
737.000
736.043
TR750x24
24
7e
750.000
749.050
737.764
736.964
724.000
722.764
TR750x44
44
7e
750.000
748.600
727.685
726.625
704.000
702.360
TR800x7
7
7e
800.000
799.575
796.375
795.900
792.000
791.281
TR800x12
12
7e
800.000
799.400
793.830
793.200
787.000
786.043
TR800x24
24
7e
800.000
799.050
787.764
786.964
774.000
772.764
TR800x44
44
7e
800.000
798.600
777.685
776.625
754.000
752.360
TR850x7
7
7e
850.000
849.575
846.375
845.900
842.000
841.281
TR850x12
12
7e
850.000
849.400
843.830
843.200
837.000
836.043
TR850x24
24
7e
850.000
849.050
837.764
836.964
824.000
822.764
TR850x44
44
7e
850.000
848.600
827.685
826.625
804.000
802.360
TR900x7
7
7e
900.000
899.575
896.375
895.900
892.000
891.281
TR900x12
12
7e
900.000
899.400
893.830
893.200
887.000
886.043
TR900x24
24
7e
900.000
899.050
887.764
886.964
874.000
872.764
TR900x44
44
7e
900.000
898.600
877.685
876.625
854.000
852.360
TR950x8
8
7e
950.000
949.550
945.868
945.368
941.000
940.243
TR950x12
12
7e
950.000
949.400
943.830
943.200
937.000
936.043
TR950x24
24
7e
950.000
949.050
937.764
936.964
924.000
922.764
TR950x44
44
7e
950.000
948.600
927.685
926.625
904.000
902.360
TR1000x8
8
7e
1000.000
999.550
995.868
995.368
991.000
990.243
TR1000x12
12
7e
1000.000
999.400
993.830
993.200
987.000
986.043
TR1000x24
24
7e
1000.000
999.050
987.764
986.964
974.000
972.764
TR1000x44
44
7e
1000.000
998.600
977.685
976.625
954.000
952.360
TR1060x8
8
7e
1060.000
1059.550
1055.868
1055.368
1051.000
1050.243
TR1060x12
12
7e
1060.000
1059.400
1053.830
1053.200
1047.000
1046.043
TR1060x24
24
7e
1060.000
1059.050
1047.764
1046.964
1034.000
1032.764
TR1060x44
44
7e
1060.000
1058.600
1037.685
1036.625
1014.000
1012.360
TR1120x8
8
7e
1120.000
1119.550
1115.868
1115.368
1111.000
1110.243
TR1120x12
12
7e
1120.000
1119.400
1113.830
1113.200
1107.000
1106.043
TR1120x24
24
7e
1120.000
1119.050
1107.764
1106.964
1094.000
1092.764
TR1120x44
44
7e
1120.000
1118.600
1097.685
1096.625
1074.000
1072.360

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