Description
Mesco Corporation offers O-rings in Buna, Viton, EPR, Aflas, Neoprene, and Teflon, Teflon Encapsulted and Kalrez. O-ring size can be determined by measuring the I.D., O.D. and thickness and matching it to the following size identification chart.
1/16″ Cross-Section (w), actual .070″ | |||||||||||
No. |
I.D.” |
Actual |
O.D.” |
No. |
I.D.” |
Actual |
O.D.” |
No. |
I.D.” |
Actual |
O.D.” |
-001* |
1/32 |
0.029 |
3/32 |
-018 |
3/4 |
0.739 |
7/8 |
-035 |
2-1/4 |
2.239 |
2-3/8 |
-002* |
3/64 |
0.042 |
9/64 |
-019 |
13/16 |
0.801 |
15/16 |
-036 |
2-3/8 |
2.364 |
2-1/2 |
-003* |
1/16 |
0.056 |
13/64 |
-020 |
7/8 |
0.864 |
1 |
-037 |
2-1/2 |
2.489 |
2-5/8 |
-004 |
5/64 |
0.070 |
13/64 |
-021 |
15/16 |
0.925 |
1-1/16 |
-038 |
2-5/8 |
2.614 |
2-3/4 |
-005 |
3/32 |
0101 |
7/32 |
-022 |
1 |
0.989 |
1-1/8 |
-039 |
2-3/4 |
2.739 |
2-7/8 |
-006 |
1/8 |
0.114 |
1/4 |
-023 |
1-1/16 |
1.051 |
1-3/16 |
-040 |
2-7/8 |
2.864 |
3 |
-007 |
5/32 |
0.145 |
9/32 |
-024 |
1-1/8 |
1.114 |
1-1/4 |
-041 |
3 |
2.989 |
3-1/8 |
-008 |
3/16 |
0.176 |
5/16 |
-025 |
1-3/16 |
1.176 |
1-5/16 |
-042 |
3-1/4 |
3.239 |
3-3/8 |
-009 |
7/32 |
0.208 |
11/32 |
-026 |
1-1/4 |
1.239 |
1-3/8 |
-043 |
3-1/2 |
3.489 |
3-5/8 |
-010 |
1/4 |
0.239 |
3/8 |
-027 |
1-5/16 |
1.301 |
1-7/16 |
-044 |
3-3/4 |
3.739 |
3-7/8 |
-011 |
5/16 |
0.301 |
7/16 |
-028 |
1-3/8 |
1.364 |
1-1/2 |
-045 |
4 |
3.989 |
4-1/8 |
-012 |
3/8 |
0.364 |
1/2 |
-029 |
1-1/2 |
1.489 |
1-5/8 |
-046 |
4-1/4 |
4.239 |
4-3/8 |
-013 |
7/16 |
0.426 |
9/16 |
-030 |
1-5/8 |
1.614 |
1-3/4 |
-047 |
4-1/2 |
4.489 |
4-5/8 |
-014 |
1/2 |
0.489 |
5/8 |
-031 |
1-3/4 |
1.739 |
1-7/8 |
-048 |
4-3/4 |
4.739 |
4-7/8 |
-015 |
9/16 |
0.551 |
11/16 |
-032 |
1-7/8 |
1.864 |
2 |
-049 |
5 |
4.989 |
5-1/8 |
-016 |
5/8 |
0.614 |
3/4 |
-033 |
2 |
1.989 |
2-1/8 |
-050 |
5-1/4 |
5.239 |
4-3/8 |
-017 |
11/16 |
0.676 |
13/16 |
-034 |
2-1/8 |
2.114 |
2-1/4 |
||||
* Note – actual cross-section of -001 is 0.040″; -002 is 0.050″; -003 is 0-060″ |
3/32″ Cross-Section (w), actual .103″ | |||||||||||
No. |
I.D.” |
Actual |
O.D.” |
No. |
I.D.” |
Actual |
O.D.” |
No. |
I.D.” |
Actual |
O.D.” |
-102 |
1/16 |
0.049 |
1/4 |
-127 |
1-7/16 |
1.424 |
1-5/8 |
-153 |
3-1/2 |
3.487 |
3-11/16 |
-103 |
3/32 |
0.081 |
9/32 |
-128 |
1-1/2 |
1.487 |
1-11/16 |
-154 |
3-3/4 |
3.737 |
3-15/16 |
-104 |
1/8 |
0.112 |
5/16 |
-129 |
1-9/16 |
1.549 |
1-3/4 |
-155 |
4 |
3.987 |
4-3/16 |
-105 |
5/32 |
0.143 |
11/32 |
-130 |
1-5/8 |
1.612 |
1-13/16 |
-156 |
4-1/4 |
4.237 |
4-7/16 |
-106 |
3/16 |
0.174 |
3/8 |
-131 |
1-11/16 |
1.674 |
1-7/8 |
-157 |
4-1/2 |
4.487 |
4-11/16 |
-107 |
7/32 |
0.206 |
13/32 |
-132 |
1-3/4 |
1.737 |
1-15/16 |
-158 |
4-3/4 |
4.737 |
4-15/16 |
-108 |
1/4 |
0.237 |
7/16 |
-133 |
1-13/16 |
1.799 |
2 |
-159 |
5 |
4.987 |
5-3/16 |
-109 |
5/16 |
0.299 |
1/2 |
-134 |
1-7/8 |
1.862 |
2-1/16 |
-160 |
5-1/4 |
5.237 |
5-7/16 |
-110 |
3/8 |
0.362 |
9/16 |
-135 |
1-15/16 |
1.925 |
2-1/8 |
-161 |
5-1/2 |
5.487 |
5-11/16 |
-111 |
7/16 |
0.424 |
5/8 |
-136 |
2 |
1.987 |
2-3/16 |
-162 |
5-3/4 |
5.737 |
5-15/16 |
-112 |
1/2 |
0.487 |
11/16 |
-137 |
2-1/16 |
2.050 |
2-1/4 |
-163 |
6 |
5.987 |
6-3/16 |
-113 |
9/16 |
0.549 |
3/4 |
-138 |
2-1/8 |
2.112 |
2-5/16 |
-164 |
6-1/4 |
6.237 |
6-7-16 |
-114 |
5/8 |
0.612 |
13/16 |
-139 |
2-3/16 |
2.175 |
2-3/8 |
-165 |
6-1/2 |
6.487 |
6-11/16 |
-115 |
11/16 |
0.674 |
7/8 |
-140 |
2-1/4 |
2.237 |
2-7/16 |
-166 |
6-3/4 |
6.737 |
6-15/16 |
-116 |
3/4 |
0.737 |
15/16 |
-141 |
2-5/16 |
2.300 |
2-1/2 |
-167 |
7 |
6.987 |
7-3/16 |
-117 |
13/16 |
0.799 |
1 |
-142 |
2-3/8 |
2.362 |
2-9/16 |
-168 |
7-1/4 |
7.237 |
7-7/16 |
-118 |
7/8 |
0.862 |
1-1/16 |
-143 |
2-7/16 |
2.425 |
2-5/8 |
-169 |
7-1/2 |
7.487 |
7-11/16 |
-119 |
15/16 |
0.924 |
1-18 |
-144 |
2-1/2 |
2.487 |
2-11/16 |
-170 |
7-3/4 |
7.737 |
7-15/16 |
-120 |
1 |
0.987 |
1-3/16 |
-145 |
2-9/16 |
2.550 |
2-3/4 |
-171 |
8 |
7.987 |
8-3/16 |
-121 |
1-1/16 |
10349 |
1-1/4 |
-146 |
2-5/8 |
2.612 |
2-13/16 |
-172 |
8-1/4 |
8.237 |
8-7/16 |
-122 |
1-1/8 |
1.112 |
1-5/16 |
-147 |
2-11/16 |
2.675 |
2-7/8 |
-173 |
8-1/2 |
4.487 |
8-11/16 |
-123 |
1-3/16 |
1.174 |
1-3/8 |
-148 |
2-3/4 |
2.737 |
2-15/16 |
-174 |
8-3/4 |
8.737 |
8-15/16 |
-124 |
1-1/4 |
1.237 |
1-7/16 |
-149 |
2-13/16 |
2.800 |
3 |
-175 |
9 |
8.987 |
9-3/16 |
-125 |
1-5/16 |
1.299 |
1-1/2 |
-150 |
2-7/8 |
2.862 |
3-1/16 |
-176 |
9-1/4 |
9.237 |
9-7/16 |
-126 |
1-3/8 |
1.362 |
1-9/16 |
-151 |
3 |
2.897 |
3-3/16 |
-177 |
9-1/2 |
9.487 |
9-11/16 |
-152 |
3-1/4 |
3.237 |
3-7/16 |
-178 |
9-3/4 |
9.737 |
9-15/16 |
1/8″ Cross-Section (w), actual .139″ | |||||||||||
No. |
I.D.” |
Actual |
O.D.” |
No. |
I.D.” |
Actual |
O.D.” |
No. |
I.D.” |
Actual |
O.D.” |
-201 |
3/16 |
0.171 |
7/16 |
-229 |
2-3/8 |
2.359 |
2-5/8 |
-257 |
5-7/8 |
5.859 |
6-1/8 |
-202 |
1/4 |
0.234 |
1/2 |
-230 |
2-1/2 |
2.484 |
2-3/4 |
-258 |
6 |
5.984 |
6-1/4 |
-203 |
5/16 |
.0296 |
9/16 |
-231 |
2-5/8 |
2.609 |
2-7/8 |
-259 |
6-1/4 |
6.234 |
6-1/2 |
-204 |
3/8 |
0.359 |
5/8 |
-232 |
2-3/4 |
2.734 |
3 |
-260 |
6-1/2 |
6.484 |
6-3/4 |
-205 |
7/16 |
0.421 |
11/16 |
-233 |
2-7/8 |
2.859 |
3-1/8 |
-261 |
6-3/4 |
6.734 |
7 |
-206 |
1/2 |
0.484 |
3/4 |
-234 |
3 |
2.984 |
3-1/4 |
-262 |
7 |
6.984 |
7-1/4 |
-207 |
9/16 |
0.546 |
13/16 |
-235 |
3-1/8 |
3.109 |
3-3/8 |
-263 |
7-1/4 |
7.234 |
7-1/2 |
-208 |
5/8 |
0.609 |
7/8 |
-236 |
3-1/4 |
3.234 |
3-1/2 |
-264 |
7-1/2 |
7.484 |
7-3/4 |
-209 |
11/16 |
0.671 |
15/16 |
-237 |
3-3/8 |
3.359 |
3-5/8 |
-265 |
7-3/4 |
7.734 |
8 |
-210 |
3/4 |
0.734 |
1 |
-238 |
3-1/2 |
3.484 |
3-3/4 |
-266 |
8 |
7.984 |
8-1/4 |
-211 |
13/16 |
0.796 |
1-1/16 |
-239 |
3-5/8 |
3.609 |
3-7/8 |
-267 |
8-1/4 |
8.234 |
8-1/2 |
-212 |
7/8 |
0.859 |
1-1/8 |
-240 |
3-3/4 |
3.734 |
4 |
-268 |
8-1/2 |
8.484 |
8-3/4 |
-213 |
15/16 |
0.921 |
1-3/16 |
-241 |
3-7/8 |
3.859 |
4-1/8 |
-269 |
8-3/4 |
8.734 |
9 |
-214 |
1 |
0.984 |
1-1/4 |
-242 |
4 |
3.984 |
4-1/4 |
-270 |
9 |
8.984 |
9-1/4 |
-215 |
1-1/16 |
1.046 |
1-5/16 |
-243 |
4-1/8 |
4.109 |
4-3/8 |
-271 |
9-1/4 |
9.234 |
9-1/2 |
-216 |
1-1/8 |
1.109 |
1-3/8 |
-244 |
4-1/4 |
4.234 |
4-1/2 |
-272 |
9-1/2 |
9.484 |
9-3/4 |
-217 |
1-3/16 |
1.171 |
1-7/16 |
-245 |
4-3/8 |
4.359 |
4-5/8 |
-273 |
9-3/4 |
9.734 |
10 |
-218 |
1-1/4 |
1.234 |
1-1/2 |
-246 |
4-1/2 |
4.484 |
4-3/4 |
-274 |
10 |
9.984 |
10-1/4 |
-219 |
1-5/16 |
1.296 |
1-9/16 |
-247 |
4-5/8 |
4.609 |
4-7/8 |
-275 |
10-1/2 |
10.484 |
10-3/4 |
-220 |
1-3/8 |
1.359 |
1-5/8 |
-248 |
4-3/4 |
4.734 |
5 |
-276 |
11 |
10.984 |
11-1/4 |
-221 |
1-7/16 |
1.421 |
1-11/16 |
-249 |
4-7/8 |
4.859 |
5-1/8 |
-277 |
11-1/2 |
11.484 |
11-3/4 |
-222 |
1-1/2 |
1.484 |
1-3/4 |
-250 |
5 |
4.984 |
5-1/4 |
-278 |
12 |
11.984 |
12-1/4 |
-223 |
1-5/8 |
1.609 |
1-7/8 |
-251 |
5-1/8 |
5.109 |
5-3/8 |
-279 |
13 |
12.984 |
13-1/4 |
-224 |
1-3/4 |
1.734 |
2 |
-252 |
5-1/4 |
5.234 |
5-1/2 |
-280 |
14 |
13.984 |
14-1/4 |
-225 |
1-7/8 |
1.859 |
2-1/8 |
-253 |
5-3/8 |
5.359 |
5-5/8 |
-281 |
15 |
14.984 |
15-1/4 |
-226 |
2 |
1.984 |
2-1/4 |
-254 |
5-1/2 |
5.484 |
5-3/4 |
-282 |
16 |
15.955 |
16-1/4 |
-227 |
2-1/8 |
2.109 |
2-3/4 |
-255 |
5-5/8 |
5.609 |
5-7/8 |
-283 |
17 |
16.955 |
17-1/4 |
-228 |
2-1/4 |
2.234 |
2-1/2 |
-256 |
5-3/4 |
5.734 |
6 |
-284 |
18 |
17.955 |
18-1/4 |
3/16″ Cross-Section (w), actual .210″ | |||||||||||
No. |
I.D.” |
Actual |
O.D.” |
No. |
I.D.” |
Actual |
O.D.” |
No. |
I.D.” |
Actual |
O.D.” |
-309 |
7/16 |
0.412 |
13/16 |
-338 |
3-1/8 |
3.100 |
3-1/2 |
-367 |
7-1/2 |
7.475 |
7-7/8 |
-310 |
1/2 |
0.475 |
7/8 |
-339 |
3-1/4 |
3.225 |
3-5/8 |
-368 |
7-3/4 |
7.725 |
8-1/8 |
-311 |
9/16 |
0.537 |
15/16 |
-340 |
3-3/8 |
3.350 |
3-3/4 |
-369 |
8 |
7.975 |
8-3/8 |
-312 |
5/8 |
0.600 |
1 |
-341 |
3-1/2 |
3.475 |
3-7/8 |
-370 |
8-1/4 |
8.225 |
8-5/8 |
-313 |
11/16 |
0.662 |
1-1/16 |
-342 |
3-5/8 |
3.600 |
4 |
-371 |
8-1/2 |
8.475 |
8-7/8 |
-314 |
3/4 |
0.725 |
1-1/8 |
-343 |
3-3/4 |
3.725 |
4-1/8 |
-372 |
8-3/4 |
8.725 |
9-1/8 |
-315 |
13/16 |
0.787 |
1-3/16 |
-344 |
3-7/8 |
3.850 |
4-1/4 |
-373 |
9 |
8.975 |
9-3/8 |
-316 |
7/8 |
0.850 |
1-1/4 |
-345 |
4 |
3.975 |
3-3/8 |
-374 |
9-1/4 |
9.225 |
9-5/8 |
-317 |
15/16 |
0.912 |
1-5/16 |
-346 |
4-1/8 |
4.100 |
4-1/2 |
-375 |
9-1/2 |
9.475 |
9-7/8 |
-318 |
1 |
0.975 |
1-3/8 |
-347 |
4-1/4 |
4.225 |
4-5/8 |
-376 |
9-3/4 |
9.725 |
10-1/8 |
-319 |
1-1/16 |
1.037 |
1-7/16 |
-348 |
4-3/8 |
4.350 |
4-3/4 |
-377 |
10 |
9.975 |
10-3/8 |
-320 |
1-1/8 |
1.100 |
1-1/2 |
-349 |
4-1/2 |
4.475 |
4-7/8 |
-378 |
10-1/2 |
10.475 |
10-7/8 |
-321 |
1-3/16 |
1.162 |
1-9/16 |
-350 |
4-5/8 |
4.600 |
5 |
-379 |
11 |
10.975 |
11-3/8 |
-322 |
1-1/4 |
1.225 |
1-5/8 |
-351 |
4-3/4 |
4.725 |
5-1/8 |
-380 |
11-1/2 |
11.475 |
11-7/8 |
-323 |
1-5/16 |
1.287 |
1-11/16 |
-352 |
3-7/8 |
4.850 |
5-1/4 |
-381 |
12 |
11.975 |
12-3/8 |
-324 |
1-3/8 |
1.350 |
1-3/4 |
-353 |
5 |
4.975 |
5-3/8 |
-382 |
13 |
12.975 |
13-3/8 |
-325 |
1-1/2 |
1.475 |
1-7/8 |
-354 |
5-1/8 |
5.100 |
5-1/2 |
-383 |
14 |
13.975 |
14-3/8 |
-326 |
1-5/8 |
1.600 |
2 |
-355 |
5-1/4 |
5.225 |
5-5/8 |
-384 |
15 |
14.975 |
15-3/8 |
-327 |
1-3/4 |
1.725 |
2-1/8 |
-356 |
5-3/8 |
5.350 |
5-3/4 |
-385 |
16 |
15.955 |
16-3/8 |
-328 |
1-7/8 |
1.850 |
2-1/4 |
-357 |
5-1/2 |
5.475 |
5-7/8 |
-386 |
17 |
16.955 |
17-3/8 |
-329 |
2 |
1.975 |
2-3/8 |
-358 |
5-5/8 |
5.600 |
6 |
-387 |
18 |
17.955 |
18-3/8 |
-330 |
2-1/8 |
2.100 |
2-1/2 |
-359 |
5-3/4 |
5.725 |
6-1/8 |
-388 |
19 |
18.955 |
19-3/8 |
-331 |
2-1/4 |
2.225 |
2-5/8 |
-360 |
5-7/8 |
5.850 |
6-1/4 |
-389 |
20 |
19.955 |
20-3/8 |
-332 |
3-3/8 |
2.350 |
2-3/4 |
-361 |
6 |
5.975 |
3-3/8 |
-390 |
21 |
20.955 |
21-3/8 |
-333 |
2-1/2 |
2.475 |
2-7/8 |
-362 |
6-1/4 |
6.225 |
6-5/8 |
-391 |
22 |
21.955 |
22-3/8 |
-334 |
2-5/8 |
2.600 |
3 |
-363 |
6-/12 |
6.475 |
6-7/8 |
-392 |
23 |
22.940 |
23-3/8 |
-335 |
2-3/4 |
2.725 |
3-1/8 |
-364 |
6-3/4 |
6.725 |
7-1/8 |
-393 |
24 |
23.940 |
24-3/8 |
-336 |
2-7/8 |
2.850 |
3-1/4 |
-365 |
7 |
6.975 |
7-3/8 |
-394 |
25 |
24.940 |
25-3/8 |
-337 |
3 |
2.975 |
3-3/8 |
-366 |
7-1/4 |
7.225 |
7-5/8 |
-395 |
26 |
25.940 |
26-3/8 |
New Sizes Available | |||||||||||
No. |
I.D.” |
Actual |
O.D.” |
No. |
I.D.” |
Actual |
O.D.” |
No. |
I.D.” |
Actual |
O.D.” |
-400 |
1-3/8 |
1.350 |
1-7/8 |
-408 |
2-3/8 |
2.350 |
2-7/8 |
-416 |
3-3/8 |
3.350 |
3-7/8 |
-401 |
1-1/2 |
1.475 |
2 |
-409 |
2-1/2 |
2.475 |
3 |
-417 |
3-1/2 |
3.475 |
4 |
-402 |
1-5/8 |
1.600 |
2-1/8 |
-410 |
2-5/8 |
2.600 |
3-1/8 |
-418 |
3-5/8 |
3.600 |
4-1/8 |
-403 |
1-3/4 |
1.725 |
2-1/4 |
-411 |
2-3/4 |
2.725 |
3-1/4 |
-419 |
3-3/4 |
3.725 |
4-1/4 |
-404 |
1-7/8 |
1.850 |
2-3/8 |
-412 |
2-7/8 |
2.850 |
3-3/8 |
-420 |
3-7/8 |
3.850 |
4-3/8 |
-405 |
2 |
1.795 |
2-1/2 |
-413 |
3 |
2.975 |
3-1/2 |
-421 |
4 |
3.975 |
4-1/2 |
-406 |
2-1/8 |
2.100 |
2-5/8 |
-414 |
3-1/8 |
3.100 |
3-5/8 |
-422 |
4-1/8 |
4.100 |
4-5/8 |
-407 |
2-1/4 |
2.225 |
2-3/4 |
-415 |
3-1/4 |
3.225 |
3-3/4 |
-423 |
4-1/4 |
4.225 |
4-3/4 |
-424 |
4-3/8 |
4.350 |
4-7/8 |
1/4″ Cross-Section (w), actual .275″ | |||||||||||
No. |
I.D.” |
Actual |
O.D.” |
No. |
I.D.” |
Actual |
O.D.” |
No. |
I.D.” |
Actual |
O.D.” |
-425 |
4-1/2 |
4.475 |
5 |
-442 |
7-1/4 |
7.225 |
7-3/4 |
-459 |
15 |
14.975 |
15-1/2 |
-426 |
4-5/8 |
4.600 |
5-1/8 |
-443 |
7-1/2 |
7.475 |
8 |
-460 |
15-1/2 |
15.475 |
16 |
-427 |
4-3/4 |
4.725 |
5-1/4 |
-444 |
7-3/4 |
7.725 |
8-1/4 |
-461 |
16 |
15.955 |
16-1/2 |
-428 |
4-7/8 |
4.850 |
5-3/8 |
-445 |
8 |
7.975 |
8-1/2 |
-462 |
16-1/2 |
16.455 |
17 |
-429 |
5 |
4.975 |
5-1/2 |
-446 |
8-1/2 |
8.475 |
9 |
-463 |
17 |
16.955 |
17-1/2 |
-430 |
5-1/8 |
5.100 |
5-5/8 |
-447 |
9 |
8.975 |
9-1/2 |
-464 |
17-1/2 |
17.455 |
18 |
-431 |
5-1/4 |
5.225 |
5-3/4 |
-448 |
9-1/2 |
9.475 |
10 |
-465 |
18 |
17.955 |
18-1/2 |
-432 |
5-3/8 |
5.350 |
5-7/8 |
-449 |
10 |
9.975 |
10-1/2 |
-466 |
18-1/2 |
18.455 |
19 |
-433 |
5-1/2 |
5.475 |
6 |
-450 |
10-1/2 |
10.475 |
11 |
-467 |
19 |
18.955 |
19-1/2 |
-434 |
5-5/8 |
5.600 |
6-1/8 |
-451 |
11 |
10.975 |
11-1/2 |
-468 |
19-1/2 |
19.455 |
20 |
-435 |
5-3/4 |
5.725 |
6-1/4 |
-452 |
11-1/2 |
11.475 |
12 |
-469 |
20 |
19.955 |
20-1/2 |
-436 |
5-7/8 |
5.850 |
6-3/8 |
-453 |
12 |
11.975 |
12-1/2 |
-470 |
21 |
20.955 |
21-1/2 |
-437 |
6 |
5.975 |
6-1/2 |
-454 |
12-1/2 |
12.475 |
13 |
-471 |
22 |
21.955 |
22-1/2 |
-438 |
6-1/4 |
6.225 |
6-3/4 |
-455 |
13 |
12.975 |
13-1/2 |
-472 |
23 |
22.940 |
23-1/2 |
-439 |
6-1/2 |
6.475 |
7 |
-456 |
13-1/2 |
13.475 |
14 |
-473 |
24 |
23.940 |
24-1/2 |
-440 |
6-3/4 |
6.725 |
7-1/4 |
-457 |
14 |
13.975 |
14-1/2 |
-474 |
25 |
24.940 |
25-1/2 |
-441 |
7 |
6.975 |
7-1/2 |
-458 |
14-1/2 |
14.475 |
15 |
-475 |
26 |
25.940 |
26-1/2 |