Peterson Spring

Spring manufacturer | Springs, snap-rings, wire forms, clips, clamps, stampings

Medium Duty ISO Inch Series

Medium-Duty-inch-spring(Solid Blue)

Efficient Operating Range is 20% to 37% deflection of free length. Maximum deflection is 37%; Long Life deflection is 25%; Optimum Life deflection is 20%. Deflection beyond this Efficient Operating Range could result in premature spring failure. Travel to Solid is a reference dimension only and should never be approached during use.

37% Deflection 25% Deflection 20% Deflection
Part# Free
Length (In)		 Load (lbs) Deflection Length Load (lbs) Deflection Length Load (lbs) Deflection Length Deflection Length
Travel To Solid		 Load @
.1″ Deflection (lbs)		 Hole Dia.
 Rod Dia.
DMD37-100 1 44 0.370 30 0.250 24 0.200 0.515 12 3/8 3/16
DMD37-125 1.25 42 0.463 28 0.313 23 0.250 0.576 9 3/8 3/16
DMD37-150 1.5 44 0.555 30 0.375 24 0.300 0.771 8 3/8 3/16
DMD37-175 1.75 47 0.648 32 0.438 25 0.350 0.922 7.2 3/8 3/16
DMD37-200 2 51 0.740 35 0.500 28 0.400 1.031 6.9 3/8 3/16
DMD37-250 2.5 40 0.925 27 0.625 22 0.500 1.226 4.3 3/8 3/16
DMD37-300 3 34 1.110 23 0.750 19 0.600 1.520 3.1 3/8 3/16
DMD37-1200 12 42 4.440 29 3.000 23 2.400 6.593 1 3/8 3/16
DMD50-100 1 63 0.370 43 0.250 34 0.200 0.443 17 1/2 9/32
DMD50-125 1.25 64 0.463 43 0.313 35 0.250 0.670 13.8 1/2 9/32
DMD50-150 1.5 58 0.555 39 0.375 32 0.300 0.720 10.5 1/2 9/32
DMD50-175 1.75 65 0.648 44 0.438 35 0.350 0.931 10 1/2 9/32
DMD50-200 2 61 0.740 41 0.500 33 0.400 1.023 8.2 1/2 9/32
DMD50-250 2.5 59 0.925 40 0.625 32 0.500 1.316 6.4 1/2 9/32
DMD50-300 3 64 1.110 44 0.750 35 0.600 1.639 5.8 1/2 9/32
DMD50-350 3.5 65 1.295 44 0.875 35 0.700 1.915 5 1/2 9/32
DMD50-1200 12 53 4.440 36 3.000 29 2.400 6.216 1.2 1/2 9/32
DMD62-100 1 107 0.370 73 0.250 58 0.200 0.431 29 5/8 11/32
DMD62-125 1.25 97 0.463 66 0.313 53 0.250 0.536 21 5/8 11/32
DMD62-150 1.5 100 0.555 68 0.375 54 0.300 0.609 18 5/8 11/32
DMD62-175 1.75 102 0.648 69 0.438 55 0.350 0.763 15.8 5/8 11/32
DMD62-200 2 108 0.740 73 0.500 58 0.400 0.892 14.6 5/8 11/32
DMD62-250 2.5 111 0.925 75 0.625 60 0.500 1.250 12 5/8 11/32
DMD62-300 3 118 1.110 80 0.750 64 0.600 1.550 10.6 5/8 11/32
DMD62-350 3.5 104 1.295 70 0.875 56 0.700 1.725 8 5/8 11/32
DMD62-400 4 102 1.480 69 1.000 55 0.800 2.053 6.9 5/8 11/32
DMD62-1200 12 111 4.440 75 3.000 60 2.400 6.439 2.5 5/8 11/32
DMD75-100 1 216 0.370 146 0.250 117 0.200 0.418 58.4 3/4 3/8
DMD75-125 1.25 202 0.463 136 0.313 109 0.250 0.554 43.6 3/4 3/8
DMD75-150 1.5 191 0.555 129 0.375 104 0.300 0.655 34.5 3/4 3/8
DMD75-175 1.75 194 0.648 131 0.438 105 0.350 0.766 30 3/4 3/8
DMD75-200 2 189 0.740 128 0.500 102 0.400 0.936 25.6 3/4 3/8
DMD75-250 2.5 199 0.925 134 0.625 108 0.500 1.228 21.5 3/4 3/8
DMD75-300 3 185 1.110 125 0.750 100 0.600 1.480 16.7 3/4 3/8
DMD75-350 3.5 185 1.295 125 0.875 100 0.700 1.757 14.3 3/4 3/8
DMD75-400 4 189 1.480 128 1.000 102 0.800 1.978 12.8 3/4 3/8
DMD75-450 4.5 190 1.665 128 1.125 103 0.900 2.127 11.4 3/4 3/8
DMD75-500 5 185 1.850 125 1.250 100 1.000 2.465 10 3/4 3/8
DMD75-550 5.5 187 2.035 127 1.375 101 1.100 2.764 9.2 3/4 3/8
DMD75-600 6 200 2.220 135 1.500 108 1.200 2.749 9 3/4 3/8
DMD75-1200 12 173 4.440 117 3.000 94 2.400 5.827 3.9 3/4 3/8
DMD100-100 1 335 0.370 226 0.250 181 0.200 0.387 90.5 1 1/2
DMD100-125 1.25 288 0.463 195 0.313 156 0.250 0.525 62.2 1 1/2
DMD100-150 1.5 273 0.555 185 0.375 148 0.300 0.627 49.2 1 1/2
DMD100-175 1.75 277 0.648 187 0.438 150 0.350 0.763 42.8 1 1/2
DMD100-200 2 284 0.740 192 0.500 154 0.400 0.900 38.4 1 1/2
DMD100-250 2.5 310 0.925 209 0.625 168 0.500 1.162 33.5 1 1/2
DMD100-300 3 275 1.110 186 0.750 149 0.600 1.415 24.8 1 1/2
DMD100-350 3.5 282 1.295 191 0.875 153 0.700 1.685 21.8 1 1/2
DMD100-400 4 271 1.480 183 1.000 146 0.800 1.928 18.3 1 1/2
DMD100-450 4.5 268 1.665 181 1.125 145 0.900 2.228 16.1 1 1/2
DMD100-500 5 268 1.850 181 1.250 145 1.000 2.538 14.5 1 1/2
DMD100-550 5.5 263 2.035 177 1.375 142 1.100 2.652 12.9 1 1/2
DMD100-600 6 262 2.220 177 1.500 142 1.200 2.952 11.8 1 1/2
DMD100-700 7 259 2.590 175 1.750 140 1.400 3.466 10 1 1/2
DMD100-800 8 260 2.960 176 2.000 141 1.600 3.922 8.8 1 1/2
DMD100-1200 12 289 4.440 195 3.000 156 2.400 6.100 6.5 1 1/2
DMD125-150 1.5 586 0.555 396 0.375 317 0.300 0.584 105.5 1-1/4 5/8
DMD125-175 1.75 590 0.648 399 0.438 319 0.350 0.720 91 1-1/4 5/8
DMD125-200 2 592 0.740 400 0.500 320 0.400 0.820 80 1-1/4 5/8
DMD125-250 2.5 588 0.925 398 0.625 318 0.500 1.081 63.6 1-1/4 5/8
DMD125-300 3 585 1.110 395 0.750 316 0.600 1.280 52.7 1-1/4 5/8
DMD125-350 3.5 603 1.295 408 0.875 326 0.700 1.530 46.6 1-1/4 5/8
DMD125-400 4 579 1.480 391 1.000 313 0.800 1.796 39.1 1-1/4 5/8
DMD125-450 4.5 573 1.665 387 1.125 310 0.900 2.040 34.4 1-1/4 5/8
DMD125-500 5 566 1.850 383 1.250 306 1.000 2.265 30.6 1-1/4 5/8
DMD125-550 5.5 568 2.035 384 1.375 307 1.100 2.549 27.9 1-1/4 5/8
DMD125-600 6 582 2.220 393 1.500 314 1.200 2.725 26.2 1-1/4 5/8
DMD125-700 7 559 2.590 378 1.750 302 1.400 3.220 21.6 1-1/4 5/8
DMD125-800 8 556 2.960 376 2.000 301 1.600 3.680 18.8 1-1/4 5/8
DMD125-1000 10 537 3.700 363 2.500 290 2.000 4.612 14.5 1-1/4 5/8
DMD125-1200 12 546 4.400 372 3.000 298 2.400 5.433 12.4 1-1/4 5/8
DMD150-200 2 892 0.740 603 0.500 482 0.400 0.774 120.6 1/1/2 3/4
DMD150-250 2.5 740 0.925 500 0.625 400 0.500 1.018 80 1/1/2 3/4
DMD150-300 3 730 1.110 494 0.750 395 0.600 1.281 65.8 1/1/2 3/4
DMD150-350 3.5 699 1.295 473 0.875 378 0.700 1.519 54 1/1/2 3/4
DMD150-400 4 789 1.480 533 1.000 426 0.800 1.767 53.3 1/1/2 3/4
DMD150-450 4.5 721 1.665 487 1.125 390 0.900 2.057 43.3 1/1/2 3/4
DMD150-500 5 688 1.850 465 1.250 372 1.000 2.300 37.2 1/1/2 3/4
DMD150-550 5.5 692 2.035 468 1.375 374 1.100 2.598 34 1/1/2 3/4
DMD150-600 6 682 2.220 461 1.500 368 1.200 2.843 30.7 1/1/2 3/4
DMD150-700 7 673 2.590 455 1.750 364 1.400 3.329 26 1/1/2 3/4
DMD150-800 8 693 2.960 468 2.000 374 1.600 4.018 23.4 1/1/2 3/4
DMD150-1000 10 759 3.700 513 2.500 410 2.000 4.620 20.5 1/1/2 3/4
DMD150-1200 12 639 4.440 432 3.000 346 2.400 5.735 14.4 1/1/2 3/4
DMD200-250 2.5 1036 0.925 700 0.625 560 0.500 1.017 112 2 1
DMD200-300 3 971 1.110 656 0.750 525 0.600 1.284 87.5 2 1
DMD200-350 3.5 971 1.295 656 0.875 525 0.700 1.550 75 2 1
DMD200-400 4 940 1.480 635 1.000 508 0.800 1.786 63.5 2 1
DMD200-450 4.5 957 1.665 647 1.125 518 0.900 1.979 57.5 2 1
DMD200-500 5 981 1.850 663 1.250 530 1.000 2.258 53 2 1
DMD200-550 5.5 1009 2.035 682 1.375 546 1.100 2.503 49.6 2 1
DMD200-600 6 1041 2.220 704 1.500 563 1.200 2.817 46.9 2 1
DMD200-700 7 1002 2.590 677 1.750 542 1.400 3.291 38.7 2 1
DMD200-800 8 977 2.960 660 2.000 528 1.600 3.892 33 2 1
DMD200-900 9 966 3.330 652 2.250 522 1.800 3.930 29 2 1
DMD200-1000 10 984 3.700 665 2.500 532 2.000 4.740 26.6 2 1
DMD200-1200 12 932 4.440 630 3.000 504 2.400 5.870 21 2 1
DMD250-300 3 1931 1.110 1305 0.750 1044 0.600 1.290 174 2-1/2 1-1/2
DMD250-350 3.5 1852 1.295 1251 0.875 1001 0.700 1.520 143 2-1/2 1-1/2
DMD250-400 4 1790 1.480 1210 1.000 968 0.800 1.740 121 2-1/2 1-1/2
DMD250-450 4.5 1765 1.665 1192 1.125 954 0.900 1.980 106 2-1/2 1-1/2
DMD250-500 5 1733 1.850 1171 1.250 937 1.000 2.220 93.7 2-1/2 1-1/2
DMD250-600 6 1683 2.220 1137 1.500 910 1.200 2.670 75.8 2-1/2 1-1/2
DMD250-700 7 1650 2.590 1115 1.750 892 1.400 3.120 63.7 2-1/2 1-1/2
DMD250-800 8 1625 2.960 1098 2.000 878 1.600 3.570 54.9 2-1/2 1-1/2
DMD250-900 9 1622 3.330 1096 2.250 877 1.800 4.060 48.7 2-1/2 1-1/2
DMD250-1000 10 1620 3.700 1095 2.500 876 2.000 4.560 43.8 2-1/2 1-1/2
DMD250-1200 12 1607 4.440 1086 3.000 869 2.400 5.450 36.2 2-1/2 1-1/2

The best products, coupled with practical, innovative thinking

Established in 1914, Peterson Spring is the largest privately held spring manufacturer in North America. Through designing, manufacturing and supplying springs, snap-rings, wire forms, clips, clamps, stampings, and a variety of sub-assemblies, Peterson Spring has expanded to 12 worldwide locations.
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