6-9
Back-Up Rings
Parker Hannifi n Corporation • O-Ring Division
2360 Palumbo Drive, Lexington, KY 40509
Phone: (859) 269-2351 • Fax: (859) 335-5128
www.parkerorings.com
Parker O-Ring Handbook
*Add Parker compound number N1444-90 to complete the call out. Example: N1444-90 8-009.
Note: These corresponding part numbers do not have identical dimensions, but they are intended for use with O-rings of the same
dimensions. Parbak sizes with no corresponding military part number are not shown.
1. Continuous back-up ring.
2. Single turn, scarf cut.
3. Double turn.
Table 6-2: Back-Up Rings Cross Reference
8-235 AN6244-13 -235
MS28783-13
-235
8-236 AN6244-14 -236
MS28783-14
-236
8-237 AN6244-15 -237
MS28783-15
-237
8-238 AN6244-16 -238
MS28783-16
-238
8-239 AN6244-17 -239
MS28783-17
-239
8-240 AN6244-18 -240
MS28783-18
-240
8-241 AN6244-19 -241
MS28783-19
-241
8-242 AN6244-20 -242
MS28783-20
-242
8-243 AN6244-21 -243
MS28783-21
-243
8-244 AN6244-22 -244
MS28783-22
-244
8-245 AN6244-23 -245
MS28783-23
-245
8-246 AN6244-24 -246
MS28783-24
-246
8-247 AN6244-25 -247
MS28783-25
-247
8-248 AN6244-26
8-249 AN6244-27
8-250 AN6244-28
8-251 AN6244-29
8-252 AN6244-30
8-253 AN6244-31
8-254 AN6244-32
8-255 AN6244-33
8-256 AN6244-34
8-257 AN6244-35
8-258 AN6244-36
8-259 AN6244-37
8-260 AN6244-38
8-261 AN6244-39
8-262 AN6244-40
8-263 AN6244-41
8-264 AN6244-42
8-265 AN6244-43
8-266 AN6244-44
8-267 AN6244-45
8-268 AN6244-46
8-269 AN6244-47
8-270 AN6244-48
8-271 AN6244-49
8-272 AN6244-50
8-273 AN6244-51
8-274 AN6244-52
8-325 AN6246-28 -325
MS28782-28
-325
8-326 AN6246-29 -326
MS28782-29
-326
8-327 AN6246-30 -327
MS28782-30
-327
8-328 AN6246-31 -328
MS28782-31
-328
8-329 AN6246-32 -329
MS28782-32
-329
8-330 AN6246-33 -330
MS28782-33
-330
8-331 AN6246-34 -331
MS28782-34
-331
8-332 AN6246-35 -332
MS28782-35
-332
8-333 AN6246-36 -333
MS28782-36
-333
8-334 AN6246-37 -334
MS28782-37
-334
8-335 AN6246-38 -335
MS28782-38
-335
8-336 AN6246-39 -336
MS28782-39
-336
8-337 AN6246-40 -337
MS28782-40
-337
8-338 AN6246-41 -338
MS28782-41
-338
8-339 AN6246-42 -339
MS28782-42
-339
8-340 AN6246-43 -340
MS28782-43
-340
8-341 AN6246-44 -341
MS28782-44
-341
8-342 AN6246-45 -342
MS28782-45
-342
8-343 AN6246-46 -343
MS28782-46
-343
8-344 AN6246-47 -344
MS28782-47
-344
8-345 AN6246-48 -345 MS28782-48 -345
8-346 AN6246-49 -346 MS28782-49 -346
8-347 AN6246-50 -347 MS28782-50 -347
8-348 AN6246-51 -348 MS28782-51 -348
8-349 AN6246-52 -349 MS28782-52 -349
8-425 AN6246-88 -425 MS28782-88 -425
8-426 AN6246-53 -426 MS28782-53 -426
8-427 AN6246-54 -427 MS28782-54 -427
8-428 AN6246-55 -428 MS28782-55 -428
8-429 AN6246-56 -429 MS28782-56 -429
8-430 AN6246-57 -430 MS28782-57 -430
8-431 AN6246-58 -431 MS28782-58 -431
8-432 AN6246-59 -432 MS28782-59 -432
8-433 AN6246-60 -433 MS28782-60 -433
8-434 AN6246-61 -434 MS28782-61 -434
8-435 AN6246-62 -435 MS28782-62 -435
8-436 AN6246-63 -436 MS28782-63 -436
8-437 AN6246-64 -437 MS28782-64 -437
8-438 AN6246-65 -438 MS28782-65 -438
8-439 AN6246-66 -439 MS28782-66 -439
8-440 AN6246-67 -440 MS28782-67 -440
8-441 AN6246-68 -441 MS28782-68 -441
8-442 AN6246-69 -442 MS28782-69 -442
8-443 AN6246-70 -443 MS28782-70 -443
8-444 AN6246-71 -444 MS28782-71 -444
8-445 AN6246-72 -445 MS28782-72 -445
8-446 AN6246-73 -446 MS28782-73 -446
8-447 AN6246-74 -447 MS28782-74 -447
8-448 AN6246-75 -448 MS28782-75 -448
8-449 AN6246-76 -449 MS28782-76 -449
8-450 AN6246-77 -450 MS28782-77 -450
8-451 AN6246-78 -451 MS28782-78 -451
8-452 AN6246-79 -452 MS28782-79 -452
8-453 AN6246-80 -453 MS28782-80 -453
8-454 AN6246-81 -454 MS28782-81 -454
8-455 AN6246-82 -455 MS28782-82 -455
8-456 AN6246-83 -456 MS28782-83 -456
8-457 AN6246-84 -457 MS28782-84 -457
8-458 AN6246-85 -458 MS28782-85 -458
8-459 AN6246-86 -459 MS28782-86 -459
8-460 AN6246-87 -460 MS28782-87 -460
Back-Up Rings Cross Reference (Continued)
Parker
N1444-90
MIL-W-5521
Leather
AS8791
PTFE
AS8791
PTFE
MIL-W-5521
Leather
Parker
N1444-90
MIL-W-5521
Leather
AS8791
PTFE
AS8791
PTFE
MIL-W-5521
Leather
Parker
Parbak
Size No.*
1
AN6244
1
AN6246
1
MS27595
1
MS28774
2
Dash No.
MS28782
3
MS28783
3
MS35803
1
Dash No.
Parker
Parbak
Size No.*
1
AN6244
1
AN6246
1
MS27595
1
MS28774
2
Dash No.
MS28782
3
MS28783
3
MS35803
1
Dash No.