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O-Rings

FSC 5331: O-Rings

Federal Supply Class (FSC) 5331 covers O-rings, the round-section elastomeric seals used to seal static and dynamic joints. The catalog includes O-rings built to AS568, MIL-SPEC, and industry standards.

O-rings seal connections in hydraulic, pneumatic, fuel, and fluid systems by compressing in a groove. They are among the most widely used sealing elements in machinery.

Common materials include nitrile (Buna-N), fluorocarbon (Viton), silicone, EPDM, and PTFE, selected for fluid compatibility and temperature range. Sizes follow standard dash-number series for repeatable replacement.

5331-01-561-9545 (25-895057)

NIIN: 01-561-9545
In stock
NSN: 5331-01-561-9545
FSC Code: 5331
MPN: 25895057

5331-01-561-9180 (25-896522)

NIIN: 01-561-9180
In stock
NSN: 5331-01-561-9180
FSC Code: 5331
MPN: 25896522

5331-01-561-8817 (25-887930)

NIIN: 01-561-8817
In stock
NSN: 5331-01-561-8817
FSC Code: 5331
MPN: 25887930

5331-01-561-7119 (25-896251)

NIIN: 01-561-7119
In stock
NSN: 5331-01-561-7119
FSC Code: 5331
MPN: 25896251

5331-01-562-3092 (25-892317)

NIIN: 01-562-3092
In stock
NSN: 5331-01-562-3092
FSC Code: 5331
MPN: 25892317

5331-01-572-0153 (25-89224001)

NIIN: 01-572-0153
In stock
NSN: 5331-01-572-0153
FSC Code: 5331
MPN: 2589224001

5331-01-539-3439 (25-888354)

NIIN: 01-539-3439
In stock
NSN: 5331-01-539-3439
FSC Code: 5331
MPN: 25888354

5331-01-512-0616 (25-889316-2)

NIIN: 01-512-0616
In stock
NSN: 5331-01-512-0616
FSC Code: 5331
MPN: 258893162

5331-01-561-6724 (25-895854A01)

NIIN: 01-561-6724
In stock
NSN: 5331-01-561-6724
FSC Code: 5331
MPN: 25895854A01

5331-01-562-0348 (25-895056)

NIIN: 01-562-0348
In stock
NSN: 5331-01-562-0348
FSC Code: 5331
MPN: 25895056

5331-01-563-2306 (25-889828)

NIIN: 01-563-2306
In stock
NSN: 5331-01-563-2306
FSC Code: 5331
MPN: 25889828

5331-01-561-7043 (25-888957)

NIIN: 01-561-7043
In stock
NSN: 5331-01-561-7043
FSC Code: 5331
MPN: 25888957

5331-01-561-8796 (25-892445)

NIIN: 01-561-8796
In stock
NSN: 5331-01-561-8796
FSC Code: 5331
MPN: 25892445

5331-01-562-8001 (25-892079)

NIIN: 01-562-8001
In stock
NSN: 5331-01-562-8001
FSC Code: 5331
MPN: 25892079

5331-01-539-3433 (25-888354)

NIIN: 01-539-3433
In stock
NSN: 5331-01-539-3433
FSC Code: 5331
MPN: 25888354

5331-01-512-0619 (25-889316)

NIIN: 01-512-0619
In stock
NSN: 5331-01-512-0619
FSC Code: 5331
MPN: 25889316

5331-01-561-8804 (25-892446)

NIIN: 01-561-8804
In stock
NSN: 5331-01-561-8804
FSC Code: 5331
MPN: 25892446

5331-01-572-0188 (25-891778)

NIIN: 01-572-0188
In stock
NSN: 5331-01-572-0188
FSC Code: 5331
MPN: 25891778

5331-01-539-3431 (25-888354)

NIIN: 01-539-3431
In stock
NSN: 5331-01-539-3431
FSC Code: 5331
MPN: 25888354

5331-01-512-0624 (25-889316)

NIIN: 01-512-0624
In stock
NSN: 5331-01-512-0624
FSC Code: 5331
MPN: 25889316

5331-01-561-9154 (25-892077)

NIIN: 01-561-9154
In stock
NSN: 5331-01-561-9154
FSC Code: 5331
MPN: 25892077

5331-01-125-2012 (637-203-2144041)

NIIN: 01-125-2012
In stock
NSN: 5331-01-125-2012
FSC Code: 5331
MPN: 6372032144041

5331-01-562-3095 (25-888814)

NIIN: 01-562-3095
In stock
NSN: 5331-01-562-3095
FSC Code: 5331
MPN: 25888814

5331-01-539-3446 (25-888354)

NIIN: 01-539-3446
In stock
NSN: 5331-01-539-3446
FSC Code: 5331
MPN: 25888354

5331-01-539-2720 (25-888294)

NIIN: 01-539-2720
In stock
NSN: 5331-01-539-2720
FSC Code: 5331
MPN: 25888294

5331-01-539-2717 (25-888291)

NIIN: 01-539-2717
In stock
NSN: 5331-01-539-2717
FSC Code: 5331
MPN: 25888291

5331-01-539-2397 (25-887812)

NIIN: 01-539-2397
In stock
NSN: 5331-01-539-2397
FSC Code: 5331
MPN: 25887812

5331-01-539-3117 (25-887814)

NIIN: 01-539-3117
In stock
NSN: 5331-01-539-3117
FSC Code: 5331
MPN: 25887814

5331-01-561-6721 (25-884423)

NIIN: 01-561-6721
In stock
NSN: 5331-01-561-6721
FSC Code: 5331
MPN: 25884423

5331-01-393-1887 (25-88388)

NIIN: 01-393-1887
In stock
NSN: 5331-01-393-1887
FSC Code: 5331
MPN: 2588388

5331-01-512-0608 (25-883209)

NIIN: 01-512-0608
In stock
NSN: 5331-01-512-0608
FSC Code: 5331
MPN: 25883209

5331-01-561-5958 (25-884409)

NIIN: 01-561-5958
In stock
NSN: 5331-01-561-5958
FSC Code: 5331
MPN: 25884409

5331-01-539-3206 (25-881437)

NIIN: 01-539-3206
In stock
NSN: 5331-01-539-3206
FSC Code: 5331
MPN: 25881437

5331-01-561-8792 (25-880631001)

NIIN: 01-561-8792
In stock
NSN: 5331-01-561-8792
FSC Code: 5331
MPN: 25880631001

5331-01-539-2725 (25-881448)

NIIN: 01-539-2725
In stock
NSN: 5331-01-539-2725
FSC Code: 5331
MPN: 25881448

5331-01-561-9177 (25-880640A09)

NIIN: 01-561-9177
In stock
NSN: 5331-01-561-9177
FSC Code: 5331
MPN: 25880640A09

5331-01-539-2459 (25-881318)

NIIN: 01-539-2459
In stock
NSN: 5331-01-539-2459
FSC Code: 5331
MPN: 25881318

5331-01-539-2473 (25-881437)

NIIN: 01-539-2473
In stock
NSN: 5331-01-539-2473
FSC Code: 5331
MPN: 25881437

5331-01-562-8494 (25-880596517)

NIIN: 01-562-8494
In stock
NSN: 5331-01-562-8494
FSC Code: 5331
MPN: 25880596517

5331-01-572-7950 (25-859774)

NIIN: 01-572-7950
In stock
NSN: 5331-01-572-7950
FSC Code: 5331
MPN: 25859774

5331-01-501-6323 (25-861844)

NIIN: 01-501-6323
In stock
NSN: 5331-01-501-6323
FSC Code: 5331
MPN: 25861844

5331-01-512-0591 (25-855426)

NIIN: 01-512-0591
In stock
NSN: 5331-01-512-0591
FSC Code: 5331
MPN: 25855426

5331-01-535-0613 (25-853709-1)

NIIN: 01-535-0613
In stock
NSN: 5331-01-535-0613
FSC Code: 5331
MPN: 258537091

5331-01-535-0630 (25-855554)

NIIN: 01-535-0630
In stock
NSN: 5331-01-535-0630
FSC Code: 5331
MPN: 25855554

5331-01-537-1664 (25-855554-3)

NIIN: 01-537-1664
In stock
NSN: 5331-01-537-1664
FSC Code: 5331
MPN: 258555543

5331-01-537-1741 (25-851815-4)

NIIN: 01-537-1741
In stock
NSN: 5331-01-537-1741
FSC Code: 5331
MPN: 258518154

5331-01-537-1643 (25-8555554-2)

NIIN: 01-537-1643
In stock
NSN: 5331-01-537-1643
FSC Code: 5331
MPN: 2585555542

5331-01-562-0334 (25-851889)

NIIN: 01-562-0334
In stock
NSN: 5331-01-562-0334
FSC Code: 5331
MPN: 25851889