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HERCULES 574 BACK-UP RING

    574 Back-Up Ring

    Molded of 90A Durometer Buna-N Rubber, these “Parback®” Style Dished Cross Section back-up rings provide excellent extrusion resistance. Stretched for installation, they return quickly to their original size for easy installation.
    NOTE: Sizes (Dash No.) correspond to standard o-ring numbers.

    SEAL INFORMATION
    MATERIAL90A BUNA-N RUBBER
    TEMPERATURE
    RANGE
    -40° TO +240° F
    PRESSURE
    RANGE
    VARIES ACCORD
    ING TO DIAMETRAL
    CLEARANCE
    Part NumberA
    Nom. ID
    B
    Nom. OD
    C
    Nom. Ht
    1/16″ C/S
    574-004
    574-005
    574-006
    574-007
    574-008
    574-009
    574-010
    574-011
    574-012
    574-013
    574-014
    574-015
    574-016
    574-017
    574-018
    574-019
    574-020
    574-021
    574-022
    574-023
    574-024
    574-025
    574-026
    574-027
    574-028
    574-029
    574-030
    574-031
    574-032
    574-033
    574-034
    574-035
    574-036
    574-037
    574-038
    574-039
    574-040
    574-041
    574-042
    574-043
    574-044
    574-045
    574-046
    574-047
    574-048
    574-049
    574-050
    5/64
    3/32
    1/8
    5/32
    3/16
    7/32
    1/4
    5/16
    3/8
    7/16
    1/2
    9/16
    5/8
    11/16
    3/4
    13/16
    7/8
    15/16
    1
    1-1/16
    1-1/8
    1-3/16
    1-1/4
    1-5/16
    1-3/8
    1-1/2
    1-5/8
    1-3/4
    1-7/8
    2
    2-1/8
    2-1/4
    2-3/8
    2-1/2
    2-5/8
    2-3/4
    2-7/8
    3
    3-1/4
    3-1/2
    3-3/4
    4
    4-1/4
    4-1/2
    4-3/4
    5
    5-1/4
    13/64
    7/32
    1/4
    9/32
    5/16
    11/32
    3/8
    7/16
    1/2
    9/16
    5/8
    11/16
    3/4
    13/16
    7/8
    15/16
    1
    1-1/16
    1-1/8
    1-3/16
    1-1/4
    1-5/16
    1-3/8
    1-7/16
    1-1/2
    1-5/8
    1-3/4
    1-7/8
    2
    2-1/8
    2-1/4
    2-3/8
    2-1/2
    2-5/8
    2-3/4
    2-7/8
    3
    3-1/8
    3-3/8
    3-5/8
    3-7/8
    4-1/8
    4-3/8
    4-5/8
    4-7/8
    5-1/8
    5-3/8
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
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    .049
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    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    .049
    3/32″ C/S
    574-102
    574-103
    574-104
    574-105
    574-106
    574-107
    574-108
    574-109
    574-110
    574-111
    574-112
    574-113
    574-114
    574-115
    574-116
    574-117
    574-118
    574-119
    574-120
    574-121
    574-122
    574-123
    574-124
    574-125
    574-126
    574-127
    574-128
    574-129
    574-130
    574-131
    574-132
    574-133
    574-134
    574-135
    574-136
    574-137
    574-138
    574-139
    574-140
    574-141
    574-142
    574-143
    574-144
    574-145
    574-146
    574-147
    574-148
    574-149
    574-150
    574-151
    574-152
    574-153
    574-154
    574-155
    574-156
    574-157
    574-158
    574-159
    574-160
    574-161
    574-162
    574-163
    574-164
    574-165
    574-166
    574-167
    574-168
    574-169
    574-170
    574-171
    574-172
    574-173
    574-174
    574-175
    574-176
    574-177
    574-178
    1/16
    3/32
    1/8
    5/32
    3/16
    7/32
    1/4
    5/16
    3/8
    7/16
    1/2
    9/16
    5/8
    11/16
    3/4
    13/16
    7/8
    15/16
    1
    1-1/16
    1-1/8
    1-3/16
    1-1/4
    1-5/16
    1-3/8
    1-7/16
    1-1/2
    1-9/16
    1-5/8
    1-11/16
    1-3/4
    1-13/16
    1-7/8
    1-15/16
    2
    2-1/16
    2-1/8
    2-3/16
    2-1/4
    2-5/16
    2-3/8
    2-7/16
    2-1/2
    2-9/16
    2-5/8
    2-11/16
    2-3/4
    2-13/16
    2-7/8
    3
    3-1/4
    3-1/2
    3-3/4
    4
    4-1/4
    4-1/2
    4-3/4
    5
    5-1/4
    5-1/2
    5-3/4
    6
    6-1/4
    6-1/2
    6-3/4
    7
    7-1/4
    7-1/2
    7-3/4
    8
    8-1/4
    8-1/2
    8-3/4
    9
    9-1/4
    9-1/2
    9-3/4
    1/4
    9/32
    5/16
    11/32
    3/8
    13/32
    7/16
    1/2
    9/16
    5/8
    11/16
    3/4
    13/16
    7/8
    15/16
    1
    1-1/16
    1-1/8
    1-3/16
    1-1/4
    1-5/16
    1-3/8
    1-7/16
    1-1/2
    1-9/16
    1-5/8
    1-11/16
    1-3/4
    1-13/16
    1-7/8
    1-15/16
    2
    2-1/16
    2-1/8
    2-3/16
    2-1/4
    2-5/16
    2-3/8
    2-7/16
    2-1/2
    2-9/16
    2-5/8
    2-11/16
    2-3/4
    2-13/16
    2-7/8
    2-15/16
    3
    3-1/16
    3-3/16
    3-7/16
    3-11/16
    3-15/16
    4-3/16
    4-7/16
    4-11/16
    4-15/16
    5-3/16
    5-7/16
    5-11/16
    5-15/16
    6-3/16
    6-7/16
    6-11/16
    6-15/16
    7-3/16
    7-7/16
    7-11/16
    7-15/16
    8-3/16
    8-7/16
    8-11/16
    8-15/16
    9-3/16
    9-7/16
    9-11/16
    9-15/16
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    .053
    1/8″ C/S
    574-202
    574-205
    574-206
    574-207
    574-208
    574-209
    574-210
    574-211
    574-212
    574-213
    574-214
    574-215
    574-216
    574-217
    574-218
    574-219
    574-220
    574-221
    574-222
    574-223
    574-224
    574-225
    574-226
    574-227
    574-228
    574-229
    574-230
    574-231
    574-232
    574-233
    574-234
    574-235
    574-236
    574-237
    574-238
    574-239
    574-240
    574-241
    574-242
    574-243
    574-244
    574-245
    574-246
    574-247
    574-248
    574-249
    574-250
    574-251
    574-252
    574-253
    574-254
    574-255
    574-256
    574-257
    574-258
    574-259
    574-260
    574-261
    574-262
    574-263
    574-264
    574-265
    574-266
    574-267
    574-268
    574-269
    574-270
    574-271
    574-272
    574-273
    574-274
    574-275
    574-276
    574-277
    574-278
    574-279
    574-280
    574-281
    574-282
    574-283
    574-284
    1/4
    7/16
    1/2
    9/16
    5/8
    11/16
    3/4
    13/16
    7/8
    15/16
    1
    1-1/16
    1-1/8
    1-3/16
    1-1/4
    1-5/16
    1-3/8
    1-7/16
    1-1/2
    1-5/8
    1-3/4
    1-7/8
    2
    2-1/8
    2-1/4
    2-3/8
    2-1/2
    2-5/8
    2-3/4
    2-7/8
    3
    3-1/8
    3-1/4
    3-3/8
    3-1/2
    3-5/8
    3-3/4
    3-7/8
    4
    4-1/8
    4-1/4
    4-3/8
    4-1/2
    4-5/8
    4-3/4
    4-7/8
    5
    5-1/8
    5-1/4
    5-3/8
    5-1/2
    5-5/8
    5-3/4
    5-7/8
    6
    6-1/4
    6-1/2
    6-3/4
    7
    7-1/4
    7-1/2
    7-3/4
    8
    8-1/4
    8-1/2
    8-3/4
    9
    9-1/4
    9-1/2
    9-3/4
    10
    10-1/2
    11
    11-1/2
    12
    13
    14
    15
    16
    17
    18
    1/2
    11/16
    3/4
    13/16
    7/8
    15/16
    1
    1-1/16
    1-1/8
    1-3/16
    1-1/4
    1-5/16
    1-3/8
    1-7/16
    1-1/2
    1-9/16
    1-5/8
    1-11/16
    1-3/4
    1-7/8
    2
    2-1/8
    2-1/4
    2-3/8
    2-1/2
    2-5/8
    2-3/4
    2-7/8
    3
    3-1/8
    3-1/4
    3-3/8
    3-1/2
    3-5/8
    3-3/4
    3-7/8
    4
    4-1/8
    4-1/4
    4-3/8
    4-1/2
    4-5/8
    4-3/4
    4-7/8
    5
    5-1/8
    5-1/4
    5-3/8
    5-1/2
    5-5/8
    5-3/4
    5-7/8
    6
    6-1/8
    6-1/4
    6-1/2
    6-3/4
    7
    7-1/4
    7-1/2
    7-3/4
    8
    8-1/4
    8-1/2
    8-3/4
    9
    9-1/4
    9-1/2
    9-3/4
    10
    10-1/4
    10-3/4
    11-1/4
    11-3/4
    12-1/4
    13-1/4
    14-1/4
    15-1/4
    16-1/4
    17-1/4
    18-1/4
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
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    .05
    .05
    .05
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    .05
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    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    .05
    3/16″ C/S
    574-309
    574-310
    574-311
    574-312
    574-313
    574-314
    574-315
    574-316
    574-317
    574-318
    574-319
    574-320
    574-321
    574-322
    574-323
    574-324
    574-325
    574-326
    574-327
    574-328
    574-329
    574-330
    574-331
    574-332
    574-333
    574-334
    574-335
    574-336
    574-337
    574-338
    574-339
    574-340
    574-341
    574-342
    574-343
    574-344
    574-345
    574-346
    574-347
    574-348
    574-349
    574-350
    574-351
    574-352
    574-353
    574-354
    574-355
    574-356
    574-357
    574-358
    574-359
    574-360
    574-361
    574-362
    574-363
    574-364
    574-365
    574-366
    574-367
    574-368
    574-369
    574-370
    574-371
    574-372
    574-373
    574-374
    574-375
    574-377
    574-378
    574-379
    574-380
    574-381
    574-382
    574-383
    574-384
    7/16
    1/2
    9/16
    5/8
    11/16
    3/4
    13/16
    7/8
    15/16
    1
    1-1/16
    1-1/8
    1-3/16
    1-1/4
    1-5/16
    1-3/8
    1-1/2
    1-5/8
    1-3/4
    1-7/8
    2
    2-1/8
    2-1/4
    2-3/8
    2-1/2
    2-5/8
    2-3/4
    2-7/8
    3
    3-1/8
    3-1/4
    3-3/8
    3-1/2
    3-5/8
    3-3/4
    3-7/8
    4
    4-1/8
    4-1/4
    4-3/8
    4-1/2
    4-5/8
    4-3/4
    4-7/8
    5
    5-1/8
    5-1/4
    5-3/8
    5-1/2
    5-5/8
    5-3/4
    5-7/8
    6
    6-1/4
    6-1/2
    6-3/4
    7
    7-1/4
    7-1/2
    7-3/4
    8
    8-1/4
    8-1/2
    8-3/4
    9
    9-1/4
    9-1/2
    10
    10-1/2
    11
    11-1/2
    12
    13
    14
    15
    13/16
    7/8
    15/16
    1
    1-1/16
    1-1/8
    1-3/16
    1-1/4
    1-5/16
    1-3/8
    1-7/16
    1-1/2
    1-9/16
    1-5/8
    1-11/16
    1-3/4
    1-7/8
    2
    2-1/8
    2-1/4
    2-3/8
    2-1/2
    2-5/8
    2-3/4
    2-7/8
    3
    3-1/8
    3-1/4
    3-3/8
    3-1/2
    3-5/8
    3-3/4
    3-7/8
    4
    4-1/8
    4-1/4
    4-3/8
    4-1/2
    4-5/8
    4-3/4
    4-7/8
    5
    5-1/8
    5-1/4
    5-3/8
    5-1/2
    5-5/8
    5-3/4
    5-7/8
    6
    6-1/8
    6-1/4
    6-3/8
    6-5/8
    6-7/8
    7-1/8
    7-3/8
    7-5/8
    7-7/8
    8-1/8
    8-3/8
    8-5/8
    8-7/8
    9-1/8
    9-3/8
    9-5/8
    9-7/8
    10-3/8
    10-7/8
    11-3/8
    11-7/8
    12-3/8
    13-3/8
    14-3/8
    15-3/8
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
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    .076
    .076
    .076
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    .076
    .076
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    .076
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    .076
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    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    .076
    1/4″ C/S
    574-425
    574-426
    574-427
    574-428
    574-429
    574-430
    574-431
    574-432
    574-433
    574-434
    574-435
    574-436
    574-437
    574-438
    574-439
    574-440
    574-441
    574-442
    574-443
    574-444
    574-445
    574-446
    574-447
    574-448
    574-449
    574-450
    574-451
    574-452
    574-453
    574-454
    574-455
    574-456
    574-457
    574-458
    574-459
    574-460
    574-461
    574-462
    574-463
    574-464
    574-465
    574-466
    574-467
    574-468
    574-469
    574-470
    574-471
    574-472
    574-473
    4-1/2
    4-5/8
    4-3/4
    4-7/8
    5
    5-1/8
    5-1/4
    5-3/8
    5-1/2
    5-5/8
    5-3/4
    5-7/8
    6
    6-1/4
    6-1/2
    6-3/4
    7
    7-1/4
    7-1/2
    7-3/4
    8
    8-1/2
    9
    9-1/2
    10
    10-1/2
    11
    11-1/2
    12
    12-1/2
    13
    13-1/2
    14
    14-1/2
    15
    15-1/2
    16
    16-1/2
    17
    17-1/2
    18
    18-1/2
    19
    19-1/2
    20
    21
    22
    23
    24
    5
    5-1/8
    5-1/4
    5-3/8
    5-1/2
    5-5/8
    5-3/4
    5-7/8
    6
    6-1/8
    6-1/4
    6-3/8
    6-1/2
    6-3/4
    7
    7-1/4
    7-1/2
    7-3/4
    8
    8-1/4
    8-1/2
    9
    9-1/2
    10
    10-1/2
    11
    11-1/2
    12
    12-1/2
    13
    13-1/2
    14
    14-1/2
    15
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