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Back-Up Rings

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Back-Up Rings are made with polyurethane and are 90 durometer shore hardness.  Use in conjunction with an o-ring to prevent extrusion.  They are much harder than rubber o-rings, yet they deform enough to block off clearance to the o-ring.

The following accessories (in addition to any quantities specified in the table below) will also be added to your cart upon clicking "Add Items to Cart"
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Enter Qty Order # Nom I.D. Dim. O.D. Position
Enter Qty Order # Nom I.D. Dim. O.D. Position
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91-006 1/8 1/4
91-006 1/8 1/4
91-008 3/16 5/16
91-009 7/32 11/32
91-010 1/4 3/8
91-011 5/16 7/16
91-012 3/8 1/2
91-013 7/16 9/16
91-014 1/2 5/8
91-015 9/16 11/16
91-016 5/8 3/4
91-017 11/16 13/16
91-018 3/4 7/8
91-019 13/16 15/16
91-020 7/8 1
91-021 15/16 1 1/16
91-022 1 1 1/8
91-023 1 1/16 1 3/16
91-024 1 1/8 1 1/4
91-025 1 3/16 1 5/16
91-026 1 1/4 1 3/8
91-027 1 5/16 1 7/16
91-028 1 3/8 1 1/2
91-029 1 1/2 1 5/8
91-030 1 5/8 1 3/4
91-031 1 3/4 1 7/8
91-032 1 7/8 2
91-033 2 2 1/8
91-034 2 1/8 2 1/4
91-035 2 1/4 2 3/8
91-036 2 3/8 2 1/2
91-037 2 1/2 2 5/8
91-038 2 5/8 2 3/4
91-039 2 3/4 2 7/8
91-040 2 7/8 3
91-041 3 3 1/8
91-042 3 1/4 3 3/8
91-043 3 1/2 3 5/8
91-044 3 3/4 3 7/8
91-045 4 4 1/8
91-046 4 1/4 4 3/8
91-048 4 3/4 4 7/8
91-049 5 5 1/8
91-050 5 1/4 5 3/8
91-109 5/16 1/2
91-110 3/8 9/16
91-111 7/16 5/8
91-112 1/2 11/16
91-113 9/16 3/4
91-114 5/8 13/16
91-115 11/16 7/8
91-116 3/4 15/16
91-117 13/16 1
91-118 7/8 1 1/16
91-119 15/16 1 1/8
91-120 1 1 3/16
91-121 1 1/16 1 1/4
91-122 1 1/8 1 5/16
91-123 1 3/16 1 3/8
91-124 1 1/4 1 7/16
91-126 1 3/8 1 9/16
91-127 1 7/16 1 5/8
91-128 1 1/2 1 11/16
91-129 1 9/16 1 3/4
91-130 1 5/8 1 13/16
91-131 1 11/16 1 7/8
91-132 1 3/4 1 15/16
91-133 1 13/16 2
91-134 1 7/8 2 1/16
91-135 1 15/16 2 1/8
91-136 2 2 3/16
91-137 2 1/16 2 1/4
91-138 2 1/8 2 5/16
91-139 2 3/16 2 3/8
91-140 2 1/4 2 7/16
91-141 2 5/16 2 1/2
91-142 2 3/8 2 9/16
91-143 2 7/16 2 5/8
91-144 2 1/2 2 11/16
91-145 2 9/16 2 3/4
91-146 2 5/8 2 13/16
91-147 2 11/16 2 7/8
91-148 2 3/4 2 15/16
91-149 2 13/16 3
91-150 2 7/8 3 1/16
91-151 3 3 3/16
91-152 3 1/4 3 7/16
91-153 3 1/2 3 11/16
91-154 3 3/4 3 15/16
91-155 4 4 3/16
91-156 4 1/4 4 7/16
91-157 4 1/2 4 11/16
91-158 4 3/4 4 15/16
91-159 5 5 3/16
91-160 5 1/4 5 7/16
91-161 5 1/2 5 11/16
91-162 5 3/4 5 15/16
91-163 6 6 3/16
91-201 3/64 17/64
91-202 1/4 1/2
91-203 5/16 9/16
91-204 3/8 5/8
91-205 7/16 11/16
91-206 1/2 3/4
91-207 9/16 13/16
91-208 5/8 7/8
91-209 11/16 15/16
91-210 3/4 1
91-211 13/16 1 1/16
91-212 7/8 1 1/8
91-213 15/16 1 3/16
91-214 1 1 1/4
91-215 1 1/16 1 5/16
91-216 1 1/8 1 3/8
91-217 1 3/16 1 7/16
91-218 1 1/4 1 1/2
91-219 1 5/16 1 9/16
91-220 1 3/8 1 5/8
91-221 1 7/16 1 11/16
91-222 1 1/2 1 3/4
91-223 1 5/8 1 7/8
91-224 1 3/4 2
91-225 1 7/8 2 1/8
91-226 2 2 1/4
91-227 2 1/8 2 3/8
91-228 2 1/4 2 1/2
91-229 2 3/8 2 5/8
91-230 2 1/2 2 3/4
91-231 2 5/8 2 7/8
91-232 2 3/4 3
91-233 2 7/8 3 1/8
91-234 3 3 1/4
91-235 3 1/8 3 3/8
91-236 3 1/4 3 1/2
91-237 3 3/8 3 5/8
91-238 3 1/2 3 3/4
91-239 3 5/8 3 7/8
91-240 3 3/4 4
91-241 3 7/8 4 1/8
91-242 4 4 1/4
91-243 4 1/8 4 3/8
91-244 4 1/4 4 1/2
91-245 4 3/8 4 5/8
91-246 4 1/2 4 3/4
91-247 4 5/8 4 7/8
91-248 4 3/4 5
91-249 4 7/8 5 1/8
91-250 5 5 1/4
91-251 5 1/8 5 3/8
91-252 5 1/4 5 1/2
91-253 5 3/8 5 5/8
91-254 5 1/2 5 3/4
91-255 5 5/8 5 7/8
91-256 5 3/4 6
91-257 5 7/8 6 1/8
91-258 6 6 1/4
91-259 6 1/4 6 1/2
91-260 6 1/2 6 3/4
91-261 6 3/4 7
91-262 7 7 1/4
91-263 7 1/4 7 1/2
91-264 7 1/2 7 3/4
91-265 7 3/4 8
91-310 1/2 7/8
91-311 9/16 15/16
91-312 5/8 1
91-313 11/16 1 1/16
91-314 3/4 1 1/8
91-315 13/16 1 3/16
91-316 7/8 1 1/4
91-317 15/16 1 5/16
91-318 1 1 3/8
91-319 1 1/16 1 7/16
91-320 1 1/8 1 1/2
91-321 1 3/16 1 9/16
91-322 1 1/4 1 5/8
91-323 1 5/16 1 11/16
91-324 1 3/8 1 3/4
91-325 1 1/2 1 7/8
91-326 1 5/8 2
91-327 1 3/4 2 1/8
91-328 1 7/8 2 1/4
91-329 2 2 3/8
91-330 2 1/8 2 1/2
91-331 2 1/4 2 5/8
91-332 2 3/8 2 3/4
91-333 2 1/2 2 7/8
91-334 2 5/8 3
91-335 2 3/4 3 1/8
91-336 2 7/8 3 1/4
91-337 3 3 3/8
91-338 3 1/8 3 1/2
91-339 3 1/4 3 5/8
91-340 3 3/8 3 3/4
91-341 3 1/2 3 7/8
91-342 3 5/8 4
91-343 3 3/4 4 1/8
91-344 3 7/8 4 1/4
91-345 4 4 3/8
91-346 4 1/8 4 1/2
91-347 4 1/4 4 5/8
91-348 4 3/8 4 3/4
91-349 4 1/2 4 7/8
91-350 4 5/8 5
91-351 4 3/4 5 1/8
91-352 4 7/8 5 1/4
91-353 5 5 3/8
91-354 5 1/8 5 1/2
91-355 5 1/4 5 5/8
91-356 5 3/8 5 3/4
91-357 5 1/2 5 7/8
91-358 5 5/8 6
91-359 5 3/4 6 1/8
91-360 5 7/8 6 1/4
91-361 6 6 3/8
91-362 6 1/4 6 5/8
91-363 6 1/2 6 7/8
91-364 6 3/4 6 7/8
91-365 7 7 3/8
91-367 7 1/2 7 7/8
91-409 2 1/2 3
91-417 3 1/2 4
91-424 4 3/8 4 7/8
91-425 4 1/2 5
91-426 4 5/8 5 1/8
91-427 4 3/4 5 1/4
91-428 4 7/8 5 3/8
91-429 5 5 1/2
91-430 5 1/8 5 5/8
91-431 5 1/4 5 3/4
91-432 5 3/8 5 7/8
91-433 5 1/2 6
91-434 5 5/8 6 1/8
91-435 5 3/4 6 1/4
91-436 5 7/8 6 3/8
91-437 6 6 1/2
91-438 6 1/4 6 3/4
91-439 6 1/2 7
91-440 6 3/4 7 1/4
91-441 7 7 1/2
91-442 7 1/4 7 3/4
91-443 7 1/2 8
91-444 7 3/4 8 1/4
91-445 8 8 1/2
91-448 9 1/2 10
902
Back-Up Rings
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