Precision Associates, Inc.
Precision Associates, Inc.
3800 North Washington Ave.
Minneapolis, MN 55412-2142
Toll Free: 1-800-394-6590
Local: +1 612-333-7464
Sales: +1 612-334-9190
Fax: 612-342-2417
Email: [email protected]
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PAI Kurv-Bak™ hard rubber back-up rings can be made in a variety of materials to help prevent early seal failure at higher pressures.
Kurv-Baks
Unit of Measure
1 2 

Item #

Nominal C/S (inches)

Nominal I.D. (inches)

Nominal O.D. (inches)

Thickness (Inches)

I.D. (inches)

O.D. (Inches)

888-332 N/A 3/16 N/A 2 3/8 N/A 2 3/4 N/A .076 N/A 2.393 N/A 2.759
888-333 N/A 3/16 N/A 2 1/2 N/A 2 7/8 N/A .076 N/A 2.518 N/A 2.884
888-334 N/A 3/16 N/A 2 5/8 N/A 3 N/A .076 N/A 2.643 N/A 3.009
888-335 N/A 3/16 N/A 2 3/4 N/A 3 1/8 N/A .076 N/A 2.768 N/A 3.134
888-336 N/A 3/16 N/A 2 7/8 N/A 3 1/4 N/A .076 N/A 2.893 N/A 3.259
888-337 N/A 3/16 N/A 3 N/A 3 3/8 N/A .076 N/A 3.018 N/A 3.384
888-338 N/A 3/16 N/A 3 1/8 N/A 3 1/2 N/A .076 N/A 3.143 N/A 3.509
888-339 N/A 3/16 N/A 3 1/4 N/A 3 5/8 N/A .076 N/A 3.273 N/A 3.639
888-340 N/A 3/16 N/A 3 3/8 N/A 3 3/4 N/A .076 N/A 3.398 N/A 3.764
888-341 N/A 3/16 N/A 3 1/2 N/A 3 7/8 N/A .076 N/A 3.523 N/A 3.889
888-342 N/A 3/16 N/A 3 5/8 N/A 4 N/A .076 N/A 3.648 N/A 4.014
888-343 N/A 3/16 N/A 3 3/4 N/A 4 1/8 N/A .076 N/A 3.773 N/A 4.139
888-344 N/A 3/16 N/A 3 7/8 N/A 4 1/4 N/A .076 N/A 3.898 N/A 4.264
888-345 N/A 3/16 N/A 4 N/A 4 3/8 N/A .076 N/A 4.028 N/A 4.394
888-346 N/A 3/16 N/A 4 1/8 N/A 4 1/2 N/A .076 N/A 4.153 N/A 4.519
888-347 N/A 3/16 N/A 4 1/4 N/A 4 5/8 N/A .076 N/A 4.278 N/A 4.644
888-348 N/A 3/16 N/A 4 3/8 N/A 4 3/4 N/A .076 N/A 4.403 N/A 4.769
888-350 N/A 3/16 N/A 4 5/8 N/A 5 N/A .076 N/A 4.653 N/A 5.019
888-351 N/A 3/16 N/A 4 3/4 N/A 5 1/8 N/A .076 N/A 4.778 N/A 5.144
888-352 N/A 3/16 N/A 4 7/8 N/A 5 1/4 N/A .076 N/A 4.903 N/A 5.269
888-349 N/A 3/16 N/A 4.5 N/A 4 7/8 N/A .076 N/A 4.528 N/A 4.894
888-353 N/A 3/16 N/A 5 N/A 5 3/8 N/A .076 N/A 5.028 N/A 5.394
888-354 N/A 3/16 N/A 5 1/8 N/A 5 1/2 N/A .076 N/A 5.153 N/A 5.519
888-355 N/A 3/16 N/A 5 1/4 N/A 5 5/8 N/A .076 N/A 5.278 N/A 5.644
888-356 N/A 3/16 N/A 5 3/8 N/A 5 3/4 N/A .076 N/A 5.403 N/A 5.769
888-357 N/A 3/16 N/A 5 1/2 N/A 5 7/8 N/A .076 N/A 5.528 N/A 5.894
888-358 N/A 3/16 N/A 5 5/8 N/A 6 N/A .076 N/A 5.653 N/A 6.019
888-359 N/A 3/16 N/A 5 3/4 N/A 6 1/8 N/A .076 N/A 5.778 N/A 6.144
888-360 N/A 3/16 N/A 5 7/8 N/A 6 1/4 N/A .076 N/A 5.903 N/A 6.269
888-361 N/A 3/16 N/A 6 N/A 6 3/8 N/A .076 N/A 6.028 N/A 6.394
888-362 N/A 3/16 N/A 6 1/4 N/A 6 5/8 N/A .076 N/A 6.278 N/A 6.644
888-364 N/A 3/16 N/A 6 3/4 N/A 7 1/8 N/A .076 N/A 6.778 N/A 7.144
888-365 N/A 3/16 N/A 7 N/A 7 3/8 N/A .076 N/A 7.028 N/A 7.394
888-367 N/A 3/16 N/A 7 1/2 N/A 7 7/8 N/A .076 N/A 7.528 N/A 7.894
888-363 N/A 3/16 N/A 7 3/4 N/A 8 1/8 N/A .076 N/A 6.528 N/A 6.894
888-368 N/A 3/16 N/A 7 3/4 N/A 8 1/8 N/A .053 N/A 7.778 N/A 8.144
888-369 N/A 3/16 N/A 8 N/A 8 3/8 N/A .076 N/A 8.028 N/A 8.394
888-370 N/A 3/16 N/A 8 1/4 N/A 8 5/8 N/A .076 N/A 8.278 N/A 8.644
888-371 N/A 3/16 N/A 8 1/2 N/A 8 7/8 N/A .076 N/A 8.528 N/A 8.894
888-372 N/A 3/16 N/A 8 3/4 N/A 9 1/8 N/A .076 N/A 8.778 N/A 9.145
888-374 N/A 3/16 N/A 9 1/4 N/A 9 5/8 N/A .076 N/A 9.278 N/A 9.644
888-379 N/A 3/16 N/A 11 N/A 11 3/8 N/A .076 N/A 11.028 N/A 11.394
888-380 N/A 3/16 N/A 11 1/2 N/A 11 7/8 N/A .076 N/A 11.528 N/A 11.894
888-382 N/A 3/16 N/A 13 N/A 13 3/8 N/A .076 N/A 13.028 N/A 13.394
888-383 N/A 3/16 N/A 14 N/A 14 3/8 N/A .076 N/A 13.975 N/A 14.341
888-384 N/A 3/16 N/A 15 N/A 15 3/8 N/A .076 N/A 15.028 N/A 15.394
888-385 N/A 3/16 N/A 16 N/A 16 3/8 N/A .076 N/A 16.008 N/A 16.374
888-392 N/A 3/16 N/A 23 N/A 23 3/8 N/A .076 N/A 22.993 N/A 23.359
888-402 N/A 1/4 N/A 1 5/8 N/A 2 1/8 N/A .117 N/A 1.659 N/A 2.131
888-403 N/A 1/4 N/A 1 3/4 N/A 2 1/4 N/A .117 N/A 1.784 N/A 2.256
888-404 N/A 1/4 N/A 1 7/8 N/A 2 3/8 N/A .117 N/A 1.909 N/A 2.381
888-405 N/A 1/4 N/A 2 N/A 2 1/2 N/A .117 N/A 2.034 N/A 2.506
888-409 N/A 1/4 N/A 2 1/2 N/A 3 N/A .117 N/A 2.534 N/A 3.006
888-413 N/A 1/4 N/A 3 N/A 3 1/2 N/A .117 N/A 3.034 N/A 3.506
888-415 N/A 1/4 N/A 3 1/4 N/A 3 3/4 N/A .117 N/A 3.294 N/A 3.766
888-417 N/A 1/4 N/A 3 1/2 N/A 4 N/A .117 N/A 3.544 N/A 4.016
888-421 N/A 1/4 N/A 4 N/A 4 1/2 N/A .117 N/A 4.044 N/A 4.516
888-422 N/A 1/4 N/A 4 1/8 N/A 4 5/8 N/A .117 N/A 4.169 N/A 4.641
888-423 N/A 1/4 N/A 4 1/4 N/A 4 3/4 N/A .117 N/A 4.294 N/A 4.766
888-424 N/A 1/4 N/A 4 3/8 N/A 4 7/8 N/A .117 N/A 4.419 N/A 4.891
888-427 N/A 1/4 N/A 4 3/4 N/A 5 1/4 N/A .117 N/A 4.801 N/A 5.273
888-428 N/A 1/4 N/A 4 7/8 N/A 5 3/8 N/A .117 N/A 4.926 N/A 5.398
888-425 N/A 1/4 N/A 4.5 N/A 5 N/A .117 N/A 4.551 N/A 5.023
888-429 N/A 1/4 N/A 5 N/A 5 1/2 N/A .117 N/A 5.051 N/A 5.523
888-430 N/A 1/4 N/A 5 1/8 N/A 5 5/8 N/A .117 N/A 5.176 N/A 5.648
888-431 N/A 1/4 N/A 5 1/4 N/A 5 3/4 N/A .117 N/A 5.301 N/A 5.773
888-432 N/A 1/4 N/A 5 3/8 N/A 5 7/8 N/A .117 N/A 5.426 N/A 5.898
888-433 N/A 1/4 N/A 5 1/2 N/A 6 N/A .117 N/A 5.551 N/A 6.023
888-426 N/A 1/4 N/A 5 5/8 N/A 5 1/8 N/A .117 N/A 4.676 N/A 5.148
888-434 N/A 1/4 N/A 5 5/8 N/A 6 1/8 N/A .117 N/A 5.676 N/A 6.148
888-435 N/A 1/4 N/A 5 3/4 N/A 6 1/4 N/A .117 N/A 5.801 N/A 6.273
888-436 N/A 1/4 N/A 5 7/8 N/A 6 3/8 N/A .117 N/A 5.926 N/A 6.398
888-437 N/A 1/4 N/A 6 N/A 6 1/2 N/A .117 N/A 6.051 N/A 6.523
888-438 N/A 1/4 N/A 6 1/4 N/A 6 3/4 N/A .117 N/A 6.274 N/A 6.746
888-439 N/A 1/4 N/A 6 1/2 N/A 7 N/A .117 N/A 6.524 N/A 6.996
888-440 N/A 1/4 N/A 6 3/4 N/A 7 1/4 N/A .117 N/A 6.774 N/A 7.246
888-441 N/A 1/4 N/A 7 N/A 7 1/2 N/A .117 N/A 7.024 N/A 7.496
888-442 N/A 1/4 N/A 7 1/4 N/A 7 3/4 N/A .117 N/A 7.274 N/A 7.746
888-443 N/A 1/4 N/A 7 1/2 N/A 8 N/A .117 N/A 7.524 N/A 7.996
888-444 N/A 1/4 N/A 7 3/4 N/A 8 1/4 N/A .117 N/A 7.774 N/A 8.246
888-445 N/A 1/4 N/A 8 N/A 8 1/2 N/A .117 N/A 8.024 N/A 8.496
888-446 N/A 1/4 N/A 8 1/2 N/A 9 N/A .117 N/A 8.524 N/A 8.996
888-447 N/A 1/4 N/A 9 N/A 9 1/2 N/A .117 N/A 9.024 N/A 9.496
888-448 N/A 1/4 N/A 9 1/2 N/A 10 N/A .117 N/A 9.524 N/A 9.996
888-449 N/A 1/4 N/A 10 N/A 10 1/2 N/A .117 N/A 10.024 N/A 10.496
888-450 N/A 1/4 N/A 10 1/2 N/A 11 N/A .117 N/A 10.524 N/A 10.996
888-451 N/A 1/4 N/A 11 N/A 11 1/2 N/A .117 N/A 11.024 N/A 11.496
888-452 N/A 1/4 N/A 11 1/2 N/A 12 N/A .117 N/A 11.524 N/A 11.996
888-453 N/A 1/4 N/A 12 N/A 12 1/2 N/A .117 N/A 12.024 N/A 12.496
888-454 N/A 1/4 N/A 12 1/2 N/A 13 N/A .117 N/A 12.524 N/A 12.996
888-455 N/A 1/4 N/A 13 N/A 13 1/2 N/A .117 N/A 13.024 N/A 13.496
888-456 N/A 1/4 N/A 13 1/2 N/A 14 N/A .117 N/A 13.524 N/A 13.996
888-457 N/A 1/4 N/A 14 N/A 14 1/2 N/A .117 N/A 14.024 N/A 14.496
888-458 N/A 1/4 N/A 14 1/2 N/A 15 N/A .117 N/A 14.524 N/A 14.996
888-459 N/A 1/4 N/A 15 N/A 15 1/2 N/A .117 N/A 15.024 N/A 15.496
888-460 N/A 1/4 N/A 15 1/2 N/A 16 N/A .117 N/A 15.524 N/A 15.996
888-461 N/A 1/4 N/A 16 N/A 16 1/2 N/A .117 N/A 16.004 N/A 16.476
888-462 N/A 1/4 N/A 16 1/2 N/A 17 N/A .117 N/A 16.504 N/A 16.976
888-463 N/A 1/4 N/A 17 N/A 17 1/2 N/A .117 N/A 17.004 N/A 17.476
888-464 N/A 1/4 N/A 17 1/2 N/A 18 N/A .117 N/A 17.504 N/A 17.976
888-465 N/A 1/4 N/A 18 N/A 18 1/2 N/A .117 N/A 18.004 N/A 18.476
888-466 N/A 1/4 N/A 18 1/2 N/A 19 N/A .117 N/A 18.504 N/A 18.976
888-467 N/A 1/4 N/A 19 N/A 19 1/2 N/A .117 N/A 19.004 N/A 19.476
888-468 N/A 1/4 N/A 19 1/2 N/A 20 N/A .117 N/A 19.504 N/A 19.976
888-469 N/A 1/4 N/A 20 N/A 20 1/2 N/A .117 N/A 20.004 N/A 20.476
888-470 N/A 1/4 N/A 21 N/A 21 1/2 N/A .117 N/A 21.004 N/A 21.476
888-471 N/A 1/4 N/A 22 N/A 22 1/2 N/A .117 N/A 22.004 N/A 22.476
Unit of Measure
1 2