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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
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    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
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    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
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    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
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    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
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    574-446
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    574-448
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    574-451
    574-452
    574-453
    574-454
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    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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    18
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    19
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    20
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    23-1/2
    24-1/2    		.117
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