| O-Rings (page 2.5 of 4) |  |
| O-Rings (page 2.5 of 4) | |
AEROSPACE STANDARD 568 DASH NUMBERS
(-001 thru -050) (-102 thru -150) (-151 thru -219) (-220 thru -269)
(-270 thru -341) (-342 thru -391) (-392 thru -475)
| (A) = Size Reference (B) = Volume Cubic Inches (C) = Volume Cubic Centimeters | |||||||||
| Nominal Size Inches | Actual Size Inches | Actual Size Millimeters | |||||||
| (A) | I.D. | O.D. | W | I.D. | W | (B) | I.D. | W | (C) |
| -270 | 9 | 9-1/4 | 1/8 | 8.984 + .050 | .139 + .004 | .4349 | 228.20 + .1.25 | 3.53 + .0.10 | 7.127 |
| -271 | 9-1/4 | 9-1/2 | 1/8 | 9.234 + .055 | .139 + .004 | .44668 | 234.55 + .1.40 | 3.53 + .0.10 | 7.322 |
| -272 | 9-1/2 | 9-3/4 | 1/8 | 9.484 + .055 | .139 + .004 | .4588 | 240.90 + .1.40 | 3.53 + .0.10 | 7.518 |
| -273 | 9-3/4 | 10 | 1/8 | 9.734 + .055 | .139 + .004 | .4707 | 247.25 + .1.40 | 3.53 + .0.10 | 7.713 |
| -274 | 10 | 10-1/4 | 1/8 | 9.984 + .055 | .139 + .004 | .4826 | 253.60 + .1.40 | 3.53 + .0.10 | 7.908 |
| -275 | 10-1/2 | 10-3/4 | 1/8 | 10.484 + .055 | .139 + .004 | .5064 | 266.30 + .1.40 | 3.53 + .0.10 | 8.298 |
| -276 | 11 | 11-1/4 | 1/8 | 10.984 + .065 | .139 + .004 | .5303 | 279.00 + .1.65 | 3.53 + .0.10 | 8.690 |
| -277 | 11-1/2 | 11-3/4 | 1/8 | 11.484 + .065 | .139 + .004 | .5541 | 291.70 + .1.65 | 3.53 + .0.10 | 9.080 |
| -278 | 12 | 12-1/4 | 1/8 | 11.984 + .065 | .139 + .004 | .5779 | 304.40 + .1.65 | 3.53 + .0.10 | 9.470 |
| -279 | 13 | 13-1/4 | 1/8 | 12.984 + .065 | .139 + .004 | .6256 | 329.80 + .1.65 | 3.53 + .0.10 | 10.252 |
| -280 | 14 | 14-1/4 | 1/8 | 13.984 + .065 | .139 + .004 | .6733 | 355.20 + .1.65 | 3.53 + .0.10 | 11.033 |
| -281 | 15 | 15-1/4 | 1/8 | 14.984 + .065 | .139 + .004 | .7210 | 380.60 + .1.65 | 3.53 + .0.10 | 11.815 |
| -282 | 16 | 16-1/4 | 1/8 | 15.955 + .075 | .139 + .004 | .7672 | 405.26 + .1.90 | 3.53 + .0.10 | 12.572 |
| -283 | 17 | 17-1/4 | 1/8 | 16.955 + .080 | .139 + .004 | .8149 | 430.66 + .2.05 | 3.53 + .0.10 | 13.354 |
| -284 | 18 | 18-1/4 | 1/8 | 17.955 + .085 | .139 + .004 | .8626 | 456.06 + .2.15 | 3.53 + .0.10 | 14.136 |
| -285 through -308 O-ring sizes not assigned | |||||||||
| -309 | 7/16 | 13/16 | 3/16 | .412 + .005 | .210 + .005 | .0677 | 10.46 + .0.12 | 5.34 + .0.12 | 1.109 |
| -310 | 1/2 | 7/8 | 3/16 | .475 + .005 | .210 + .005 | .0745 | 12.07 + .0.12 | 5.34 + .0.12 | 1.221 |
| -311 | 9/16 | 15/16 | 3/16 | .537 + .007 | .210 + .005 | .0813 | 13.64 + .0.17 | 5.34 + .0.12 | 1.332 |
| -312 | 5/8 | 1 | 3/16 | .600 + .009 | .210 + .005 | .0881 | 15.24 + .0.22 | 5.34 + .0.12 | 1.444 |
| -313 | 11/16 | 1-1/16 | 3/16 | .662 + .009 | .210 + .005 | .0949 | 16.81 + .0.22 | 5.34 + .0.12 | 1.555 |
| -314 | 3/4 | 1-1/8 | 3/16 | .725 + .010 | .210 + .005 | .1017 | 18.42 + .0.25 | 5.34 + .0.12 | 1.667 |
| -315 | 13/16 | 1-3/16 | 3/16 | .787 + .010 | .210 + .005 | .1085 | 19.99 + .0.25 | 5.34 + .0.12 | 1.778 |
| -316 | 7/8 | 1-1/4 | 3/16 | .850 + .010 | .210 + .005 | .0053 | 21.59 + .0.25 | 5.34 + .0.12 | 1.889 |
| -317 | 15/16 | 1-5/16 | 3/16 | .912 + .010 | .210 + .005 | .1221 | 23.16 + .0.25 | 5.34 + .0.12 | 2.001 |
| -318 | 1 | 1-3/8 | 3/16 | .975 + .010 | .210 + .005 | .1289 | 24.77 + .0.25 | 5.34 + .0.12 | 2.112 |
| -319 | 1-1/16 | 1-7/16 | 3/16 | 1.037 + .010 | .210 + .005 | .1357 | 26.34 + .0.25 | 5.34 + .0.12 | 2.224 |
| -320 | 1-1/8 | 1-1/2 | 3/16 | 1.100 + .012 | .210 + .005 | .1425 | 27.94 + .0.30 | 5.34 + .0.12 | 2.335 |
| -321 | 1-3/16 | 1-9/16 | 3/16 | 1.062 + .012 | .210 + .005 | .1493 | 29.51 + .0.30 | 5.34 + .0.12 | 2.447 |
| -322 | 1-1/4 | 1-5/8 | 3/16 | 1.225 + .012 | .210 + .005 | .1561 | 31.12 + .0.30 | 5.34 + .0.12 | 2.558 |
| -323 | 1-5/16 | 1-11/16 | 3/16 | 1.287 + .012 | .210 + .005 | .1629 | 32.69 + .0.30 | 5.34 + .0.12 | 2.669 |
| -324 | 1-3/8 | 1-3/4 | 3/16 | 1.350 + .012 | .210 + .005 | .1697 | 34.29 + .0.30 | 5.34 + .0.12 | 2.781 |
| -325 | 1-1/2 | 1-7/8 | 3/16 | 1.475 + .015 | .210 + .005 | .1833 | 37.47 + .0.38 | 5.34 + .0.12 | 3.004 |
| -326 | 1-5/8 | 2 | 3/16 | 1.600 + .015 | .210 + .005 | .1970 | 40.65 + .0.38 | 5.34 + .0.12 | 3.228 |
| -327 | 1-3/4 | 2-1/8 | 3/16 | 1.725 + .015 | .210 + .005 | .2106 | 43.82 + .0.38 | 5.34 + .0.12 | 3.451 |
| -328 | 1-7/8 | 2-1/4 | 3/16 | 1.850 + .015 | .210 + .005 | .2242 | 46.99 + .0.38 | 5.34 + .0.12 | 3.674 |
| -329 | 2 | 2-3/8 | 3/16 | 1.975 + .018 | .210 + .005 | .2378 | 50.16 + .0.46 | 5.34 + .0.12 | 3.897 |
| -330 | 2-1/8 | 2-1/2 | 3/16 | 2.100 + .018 | .210 + .005 | .2514 | 53.34 + .0.46 | 5.34 + .0.12 | 4.120 |
| -331 | 2-1/4 | 2-5/8 | 3/16 | 2.225 + .018 | .210 + .005 | .2650 | 56.52 + .0.46 | 5.34 + .0.12 | 4.343 |
| -332 | 2-3/8 | 2-3/4 | 3/16 | 2.350 + .018 | .210 + .005 | .2789 | 59.69 + .0.46 | 5.34 + .0.12 | 4.565 |
| -333 | 2-1/2 | 2-7/8 | 3/16 | 2.475 + .020 | .210 + .005 | .2922 | 62.87 + .0.50 | 5.34 + .0.12 | 4.788 |
| -334 | 2-5/8 | 3 | 3/16 | 2.600 + .020 | .210 + .005 | .3058 | 66.04 + .0.50 | 5.34 + .0.12 | 5.011 |
| -335 | 2-3/4 | 3-1/8 | 3/16 | 2.725 + .020 | .210 + .005 | .3194 | 69.22 + .0.50 | 5.34 + .0.12 | 5.234 |
| -336 | 2-7/8 | 3-1/4 | 3/16 | 2.850 + .020 | .210 + .005 | .3330 | 72.39 + .0.50 | 5.34 + .0.12 | 5.457 |
| -337 | 3 | 3-3/8 | 3/16 | 2.975 + .024 | .210 + .005 | .3466 | 75.57 + .0.61 | 5.34 + .0.12 | 5.680 |
| -338 | 3-1/8 | 3/1/2 | 3/16 | 3.100 + .024 | .210 + .005 | .3502 | 78.74 + .0.61 | 5.34 + .0.12 | 5.903 |
| -339 | 3-1/4 | 3-5/8 | 3/16 | 3.225 + .024 | .210 + .005 | .3738 | 81.92 + .0.61 | 5.34 + .0.12 | 6.125 |
| -340 | 3-3/8 | 3-3/4 | 3/16 | 3.350 + .024 | .210 + .005 | .3874 | 85.09 + .0.61 | 5.34 + .0.12 | 6.348 |
| -341 | 3-1/2 | 3-7/8 | 3/16 | 3.475 + .024 | .210 + .005 | .4010 | 88.27 + .0.61 | 5.34 + .0.12 | 6.571 |
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