The following O-Ring tolerances are for general purpose O-Rings and X-Rings. Tighter O-Ring tolerances are available for high performance applications as much as 75% to 50% tighter than general purpose listed here. USA Military and Aerospace grade O-Rings typically refer to AS568 O-Ring Tolerances (slightly tighter than general purpose) and are available standard with most military and aerospace O-Ring specifications. Please contact us to review capabilities for your application.

O-RING TOLERANCES CROSS-SECTION GENERAL PURPOSE INTERNATIONAL (Millimeters and INCHES)

O-Ring Cross Section (mm) Tolerance (mm) O-Ring Cross Section (Inches) Tolerance (Inches)
0.00 to 1.79 +/- 0.07 0.00 to 0.069 +/-  0.003
1.80 to 2.64 +/- 0.08 0.070 to 0.102 +/-  0.003
2.65 to 3.54 +/- 0.09 0.103 to 0.138 +/-  0.004
3.55 to 5.29 +/-  0.10 0.139 to 0.209 +/-  0.004
5.30 to  6.99 +/-  0.13 0.210 to 0.274 +/-  0.005
7.00 to 8.00 +/-  0.15 0.275 to 0.314 +/-  0.006
8.01 to 10.00 +/-  0.20 0.315 to 0.394 +/-  0.008
10.01 to 15.00 +/-  0.25 0.395 to 0.590 +/-  0.010
15.01 to 25.00 +/-  0.35 0.591 to 0.984 +/-  0.014
25.01 to 100.00 +/-  0.45 0.985 to 3.937 +/-  0.018

O-RING TOLERANCES INSIDE DIAMETER INTERNATIONAL GENERAL PURPOSE (Millimeters)

O-Ring Inside Diameter (mm) Tolerance
(mm)
O-Ring Inside Diameter (mm) Tolerance
(mm)
O-Ring Inside Diameter (mm) Tolerance
(mm)
0.00 to 1.79 +/-  0.12 100.01 to 103.00 +/-  0.85 307.01 to 311.00 +/-  2.21
1.80 to 2.80 +/-  0.13 103.01 to 106.00 +/-  0.87 311.01 to 315.00 +/-  2.24
2.81 to 4.00 +/-  0.14 106.01 to 109.00 +/-  0.89 315.01 to 320.00 +/-  2.27
4.01 to 5.30 +/-  0.15 109.01 to 112.00 +/-  0.91 320.01 to 325.00 +/-  2.30
5.31 to 7.10 +/-  0.16 112.01 to 115.00 +/-  0.93 325.01 to 330.00 +/-  2.33
7.11 to 8.50 +/-  0.17 115.01 to 118.00 +/-  0.95 330.01 to 335.00 +/-  2.36
8.51 to 9.75 +/-  0.18 118.01 to 122.00 +/-  0.97 335.01 to 340.00 +/-  2.40
9.76 to 11.80 +/-  0.19 122.01 to 125.00 +/-  0.99 340.01 to 345.00 +/-  2.43
11.81 to 13.20 +/-  0.21 125.01 to 128.00 +/-  1.01 345.01 to 350.00 +/-  2.46
13.21 to 15.00 +/-  0.22 128.01 to 132.00 +/-  1.04 350.01 to 355.00 +/-  2.49
15.01 to 16.00 +/-  0.23 132.01 to 136.00 +/-  1.07 355.01 to 360.00 +/-  2.52
16.01 to 17.00 +/-  0.24 136.01 to 140.00 +/-  1.09 360.01 to 365.00 +/-  2.56
17.01 to 19.00 +/-  0.25 140.01 to 142.50 +/-  1.11 365.01 to 370.00 +/-  2.59
19.01 to 20.60 +/-  0.26 142.51 to 145.00 +/-  1.13 370.01 to 375.00 +/-  2.62
20.61 to 21.20 +/-  0.27 145.01 to 147.50 +/-  1.14 375.01 to 379.00 +/-  2.64
21.21 to 22.40 +/-  0.28 147.51 to 150.00 +/-  1.16 379.01 to 383.00 +/-  2.67
22.41 to 23.60 +/-  0.29 150.01 to 152.50 +/-  1.18 383.01 to 387.00 +/-  2.70
23.61 to 25.00 +/-  0.30 152.51 to 155.00 +/-  1.19 387.01 to 391.00 +/-  2.72
25.01 to 26.50 +/-  0.31 155.01 to 157.50 +/-  1.21 391.01 to 395.00 +/-  2.75
26.51 to 28.00 +/-  0.32 157.51 to 160.00 +/-  1.23 395.01 to 400.00 +/-  2.78
28.01 to 29.00 +/-  0.33 160.01 to 162.50 +/-  1.24 400.01 to 406.00 +/-  2.82
29.01 to 30.00 +/-  0.34 162.51 to 165.00 +/-  1.25 406.01 to 412.00 +/-  2.85
30.01 to 31.50 +/-  0.35 165.01 to 167.50 +/-  1.28 412.01 to 418.00 +/-  2.89
31.51 to 33.50 +/-  0.36 167.51 to 170.00 +/-  1.29 418.01 to 425.00 +/-  2.93
33.51 to 34.50 +/-  0.37 170.01 to  172.50 +/-  1.31 425.01 to 429.00 +/-  2.96
34.51 to 36.50 +/-  0.38 172.51 to 175.00 +/-  1.33 429.01 to 433.00 +/-  2.99
36.51 to 37.50 +/-  0.39 175.01 to 177.50 +/-  1.34 433.01 to 437.00 +/-  3.01
37.51 to 38.70 +/-  0.40 177.51 to 180.00 +/-  1.36 437.01 to 443.00 +/-  3.05
40.01 to 41.20 +/-  0.42 182.51 to 185.00 +/-  1.39 450.01 to 456.00 +/-  3.13
41.21 to 42.50 +/-  0.43 185.01 to 187.50 +/-  1.41 456.01 to 462.00 +/-  3.17
42.51 to 45.00 +/-  0.44 187.51 to 190.00 +/-  1.43 462.01 to 466.00 +/-  3.19
45.01 to 46.20 +/-  0.45 190.01 to 195.00 +/-  1.45 466.01 to 470.00 +/-  3.22
46.21 to 47.50 +/-  0.46 195.01 to 200.00 +/-  1.49 470.01 to 475.00 +/-  3.25
47.51 to 48.70 +/-  0.47 200.01 to 203.00 +/-  1.51 475.01 to 479.00 +/-  3.28
48.71 to 50.00 +/-  0.48 203.01 to 206.00 +/-  1.53 479.01 to 483.00 +/-  3.30
50.01 to 51.50 +/-  0.49 206.01 to 212.00 +/-  1.57 483.01 to 487.00 +/-  3.33
51.51 to 53.00 +/-  0.50 212.01 to 218.00 +/-  1.61 487.01 to 493.00 +/-  3.36
53.01 to 54.50 +/-  0.51 218.01 to 224.00 +/-  1.65 493.01 to 500.00 +/-  3.41
54.51 to 56.00 +/-  0.52 224.01 to 227.00 +/-  1.67 500.01 to 508.00 +/-  3.46
56.01 to 58.00 +/-  0.54 227.01 to 230.00 +/-  1.69 508.01 to 515.00 +/-  3.50
58.01 to 60.00 +/-  0.55 230.01 to 236.00 +/-  1.73 515.01 to 523.00 +/-  3.55
60.01 to 61.50 +/-  0.56 236.01 to 239.00 +/-  1.75 523.01 to 530.00 +/-  3.60
61.51 to 63.00 +/-  0.57 239.01 to 243.00 +/-  1.77 530.01 to 538.00 +/-  3.65
63.01 to 65.00 +/-  0.58 243.01 to 250.00 +/-  1.82 538.01 to 545.00 +/-  3.69
65.01 to 67.00 +/-  0.60 250.01 to 254.00 +/-  1.84 545.01 to 553.00 +/-  3.74
67.01 to 69.00 +/-  0.61 254.01 to 258.00 +/-  1.87 553.01 to 560.00 +/-  3.78
69.01 to 71.00 +/-  0.63 258.01 to 261.00 +/-  1.89 560.01 to 570.00 +/-  3.85
71.01 to 73.00 +/-  0.64 261.01 to 265.00 +/-  1.91 570.01 to 580.00 +/-  3.91
73.01 to 75.00 +/-  0.65 265.01 to 268.00 +/-  1.92 580.01 to 590.00 +/-  3.97
75.01 to 77.50 +/-  0.67 268.01 to 272.00 +/-  1.96 590.01 to 600.00 +/-  4.03
77.51 to 80.00 +/-  0.69 272.01 to 276.00 +/-  1.98 600.01 to 608.00 +/-  4.08
80.01 to 82.50 +/-  0.71 276.01 to 280.00 +/-  2.01 608.01 to 615.00 +/-  4.12
82.51 to 85.00 +/-  0.72 280.01 to 283.00 +/-  2.03 615.01 to 623.00 +/-  4.17
85.01 to 87.50 +/-  0.74 283.01 to 286.00 +/-  2.05 623.01 to 630.00 +/-  4.22
87.51 to 90.00 +/-  0.76 286.01 to 290.00 +/-  2.08 630.01 to 640.00 +/-  4.28
90.01 to 92.50 +/-  0.77 290.01 to 295.00 +/-  2.11 640.01 to 650.00 +/-  4.34
92.51 to 95.00 +/-  0.79 295.01 to 300.00 +/-  2.14 650.01 to 660.00 +/-  4.40
95.01 to 100.00 +/-  0.81 300.01 to 307.00 +/-  2.16 660.01 to 670.00 +/-  4.47

O-RING TOLERANCES INSIDE DIAMETER INTERNATIONAL GENERAL PURPOSE (Inches)

O-Ring Inside Diameter (Inches) Tolerance (Inches) O-Ring Inside Diameter (Inches) Tolerance (Inches) O-Ring Inside Diameter (Inches) Tolerance (Inches)
0.000 to 0.070 +/-  0.005 3.938 to 4.055 +/-  0.033 12.087 to 12.243 +/-  0.087
0.071 to 0.110 +/-  0.005 4.056 to 4.173 +/-  0.034 12.244 to 12.401 +/-  0.088
0.111 to 0.157 +/-  0.006 4.174 to 4.291 +/-  0.035 12.402 to 12.598 +/-  0.089
0.158 to 0.208 +/-  0.006 4.292 to 4.409 +/-  0.036 12.599 to 12.795 +/-  0.091
0.209 to 0.279 +/-  0.006 4.410 to 4.527 +/-  0.037 12.796 to 12.991 +/-  0.092
0.280 to 0.334 +/-  0.007 4.528 to 4.645 +/-  0.037 12.992 to 13.188 +/-  0.093
0.335 to 0.383 +/-  0.007 4.646 to 4.803 +/-  0.038 13.189 to 13.385 +/-  0.094
0.384 to 0.464 +/-  0.007 4.804 to 4.921 +/-  0.039 13.386 to 13.582 +/-  0.096
0.465 to 0.519 +/-  0.008 4.922 to 5.039 +/-  0.040 13.583 to 13.779 +/-  0.097
0.520 to 0.590 +/-  0.009 5.040 to 5.196 +/-  0.041 13.780 to 13.976 +/-  0.098
0.591 to 0.629 +/-  0.009 5.197 to 5.354 +/-  0.042 13.977 to 14.173 +/-  0.099
0.630 to 0.669 +/-  0.009 5.355 to 5.511 +/-  0.043 14.174 to 14.369 +/-  0.101
0.670 to 0.747 +/-  0.010 5.512 to 5.610 +/-  0.044 14.370 to 14.566 +/-  0.102
0.748 to 0.810 +/-  0.010 5.611 to 5.708 +/-  0.044 14.567 to 14.763 +/-  0.103
0.811 to 0.834 +/-  0.011 5.709 to 5.806 +/-  0.045 14.764 to 14.921 +/-  0.104
0.835 to 0.881 +/-  0.011 5.807 to 5.905 +/-  0.046 14.922 to 15.078 +/-  0.105
0.882 to 0.929 +/-  0.011 5.906 to 6.003 +/-  0.046 15.079 to 15.236 +/-  0.106
0.930 to 0.984 +/-  0.012 6.004 to 6.102 +/-  0.047 15.237 to 15.393 +/-  0.107
0.985 to 1.043 +/-  0.012 6.103 to 6.200 +/-  0.048 15.394 to 15.551 +/-  0.108
1.044 to 1.102 +/-  0.013 6.201 to 6.299 +/-  0.048 15.552 to 15.747 +/-  0.109
1.103 to 1.141 +/-  0.013 6.300 to 6.397 +/-  0.049 15.748 to 15.984 +/-  0.111
1.142 to 1.180 +/-  0.013 6.398 to 6.495 +/-  0.049 15.985 to 16.220 +/-  0.112
1.181 to 1.240 +/-  0.014 6.496 to 6.594 +/-  0.050 16.221 to 16.456 +/-  0.114
1.241 to 1.318 +/-  0.014 6.595 to 6.692 +/-  0.051 16.457 to 16.732 +/-  0.115
1.319 to 1.358 +/-  0.015 6.693 to 6.791 +/-  0.052 16.733 to 16.889 +/-  0.117
1.359 to 1.436 +/-  0.015 6.792 to 6.889 +/-  0.052 16.890 to 17.047 +/-  0.118
1.437 to 1.476 +/-  0.015 6.890 to 6.988 +/-  0.053 17.048 to 17.204 +/-  0.119
1.477 to 1.574 +/-  0.016 6.989 to 7.184 +/-  0.054 17.205 to 17.716 +/-  0.120
1.575 to 1.621 +/-  0.017 7.185 to 7.283 +/-  0.055 17.717 to 17.952 +/-  0.123
1.622 to 1.673 +/-  0.017 7.284 to 7.381 +/-  0.056 17.953 to 18.188 +/-  0.125
1.674 to 1.771 +/-  0.017 7.382 to 7.480 +/-  0.056 18.189 to 18.346 +/-  0.126
1.772 to 1.818 +/-  0.018 7.481 to 7.677 +/-  0.057 18.347 to 18.503 +/-  0.127
1.819 to 1.869 +/-  0.018 7.678 to 7.873 +/-  0.059 18.504 to 18.700 +/-  0.128
1.870 to 1.917 +/-  0.019 7.874 to 7.992 +/-  0.059 18.701 to 18.858 +/-  0.129
1.918 to 1.968 +/-  0.019 7.993 to 8.110 +/-  0.060 18.859 to 19.015 +/-  0.130
1.969 to 2.027 +/-  0.019 8.111 to 8.346 +/-  0.062 19.016 to 19 173 +/-  0.131
2.028 to 2.086 +/-  0.020 8.347 to 8.582 +/-  0.063 19.174 to 19.409 +/-  0.132
2.087 to 2.145 +/-  0.020 8.583 to 8.818 +/-  0.065 19.410 to 19.684 +/-  0.134
2.146 to 2.204 +/-  0.020 8.819 to 8.936 +/-  0.066 19.685 to 19.999 +/-  0.136
2.205 to 2.283 +/-  0.021 8.937 to 9.054 +/-  0.067 20.000 to 20.275 +/-  0.138
2.284 to 2.362 +/-  0.022 9.055 to 9.291 +/-  0.068 20.276 to 20.590 +/-  0.140
2.363 to 2.421 +/-  0.022 9.292 to 9.409 +/-  0.069 20.591 to 20.865 +/-  0.142
2.422 to 2.480 +/-  0.022 9.410 to 9.566 +/-  0.070 20.866 to 21.180 +/-  0.144
2.481 to 2.558 +/-  0.023 9.567 to 9.842 +/-  0.072 21.181 to 21.456 +/-  0.145
2.559 to 2.637 +/-  0.024 9.843 to 9.999 +/-  0.072 21.457 to 21.771 +/-  0.147
2.638 to 2.716 +/-  0.024 10.000 to 10.157 +/-  0.074 21.772 to 22.047 +/-  0.149
2.717 to 2.795 +/-  0.025 10.158 to 10.275 +/-  0.074 22.048 to 22.440 +/-  0.152
2.796 to 2.873 +/-  0.021 10.276 to 10.432 +/-  0.075 22.441 to 22.834 +/-  0.154
2.874 to 2.952 +/-  0.026 10.433 to 10.551 +/-  0.076 22.835 to 23.228 +/-  0.156
2.953 to 3.051 +/-  0.026 10.552 to 10.708 +/-  0.077 23.229 to 23.621 +/-  0.159
3.052 to 3.149 +/-  0.027 10.709 to 10.866 +/-  0.078 23.622 to 23.936 +/-  0.161
3.150 to 3.247 +/-  0.028 10.867 to 11.023 +/-  0.079 23.937 to 24.212 +/-  0.162
3.248 to 3.346 +/-  0.028 11.024 to 11.141 +/-  0.080 24.213 to 24.527 +/-  0.164
3.347 to 3.444 +/-  0.029 11.142 to 11.259 +/-  0.081 24.528 to 24.802 +/-  0.166
3.445 to 3.543 +/-  0.030 11.260 to 11.417 +/-  0.082 24.803 to 25.196 +/-  0.169
3.544 to 3.641 +/-  0.030 11.418 to 11.614 +/-  0.083 25.197 to 25.590 +/-  0.171
3.642 to 3.740 +/-  0.031 11.615 to 11.810 +/-  0.084 25.591 to 25.984 +/-  0.173
3.741 to 3.937 +/-  0.032 11.811 to 12.086 +/-  0.085 25.985 to 26.378 +/-  0.176

New Customer Hotline: 800-775-6525

Existing Customer Specialist: 800-775-6525 or repeat customers

Marco Rubber & Plastics
PO Box 1150
Seabrook, NH 03874

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