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

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.

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
2max. = 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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