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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.

5331-01-421-6228 (375B212QTA)

NIIN: 01-421-6228
In stock
NSN: 5331-01-421-6228
FSC Code: 5331
MPN: 375B212QTA

5331-01-533-7649 (37404-14)

NIIN: 01-533-7649
In stock
NSN: 5331-01-533-7649
FSC Code: 5331
MPN: 3740414

5331-01-388-5246 (37362-3)

NIIN: 01-388-5246
In stock
NSN: 5331-01-388-5246
FSC Code: 5331
MPN: 373623

5331-01-351-7621 (37362-1)

NIIN: 01-351-7621
In stock
NSN: 5331-01-351-7621
FSC Code: 5331
MPN: 373621

5331-00-585-9593 (779854-5)

NIIN: 00-585-9593
In stock
NSN: 5331-00-585-9593
FSC Code: 5331
MPN: 7798545

5331-00-081-3207 (77988SH2PC70)

NIIN: 00-081-3207
In stock
NSN: 5331-00-081-3207
FSC Code: 5331
MPN: 77988SH2PC70

5331-00-298-0170 (779854-3)

NIIN: 00-298-0170
In stock
NSN: 5331-00-298-0170
FSC Code: 5331
MPN: 7798543

5331-00-599-0792 (779854-2)

NIIN: 00-599-0792
In stock
NSN: 5331-00-599-0792
FSC Code: 5331
MPN: 7798542

5331-01-521-0223 (371-7631)

NIIN: 01-521-0223
In stock
NSN: 5331-01-521-0223
FSC Code: 5331
MPN: 3717631

5331-99-471-3448 (3712-2/3IN)

NIIN: 99-471-3448
In stock
NSN: 5331-99-471-3448
FSC Code: 5331
MPN: 371223IN

5331-99-335-9707 (3712-3-2IN)

NIIN: 99-335-9707
In stock
NSN: 5331-99-335-9707
FSC Code: 5331
MPN: 371232IN

5331-99-742-5367 (3712-2/2IN)

NIIN: 99-742-5367
In stock
NSN: 5331-99-742-5367
FSC Code: 5331
MPN: 371222IN

5331-99-957-9471 (A3.3712-3-3IN/6)

NIIN: 99-957-9471
In stock
NSN: 5331-99-957-9471
FSC Code: 5331
MPN: A3371233IN6

5331-99-666-3448 (3712-2/2IN)

NIIN: 99-666-3448
In stock
NSN: 5331-99-666-3448
FSC Code: 5331
MPN: 371222IN

5331-99-940-0371 (3712-2/3IN)

NIIN: 99-940-0371
In stock
NSN: 5331-99-940-0371
FSC Code: 5331
MPN: 371223IN

5331-01-562-0100 (370-X0506589-01)

NIIN: 01-562-0100
In stock
NSN: 5331-01-562-0100
FSC Code: 5331
MPN: 370X050658901

5331-00-811-1280 (77765-55X54PC12)

NIIN: 00-811-1280
In stock
NSN: 5331-00-811-1280
FSC Code: 5331
MPN: 7776555X54PC12

5331-00-980-5343 (77725-66X1PC12)

NIIN: 00-980-5343
In stock
NSN: 5331-00-980-5343
FSC Code: 5331
MPN: 7772566X1PC12

5331-00-980-5318 (77725-66X1PC11)

NIIN: 00-980-5318
In stock
NSN: 5331-00-980-5318
FSC Code: 5331
MPN: 7772566X1PC11

5331-00-980-5342 (77725-66X1PC21)

NIIN: 00-980-5342
In stock
NSN: 5331-00-980-5342
FSC Code: 5331
MPN: 7772566X1PC21

5331-00-980-5390 (77725-66X1PC13)

NIIN: 00-980-5390
In stock
NSN: 5331-00-980-5390
FSC Code: 5331
MPN: 7772566X1PC13

5331-01-200-6005 (77719-03X3)

NIIN: 01-200-6005
In stock
NSN: 5331-01-200-6005
FSC Code: 5331
MPN: 7771903X3

5331-00-719-7664 (77649-21X13PC3)

NIIN: 00-719-7664
In stock
NSN: 5331-00-719-7664
FSC Code: 5331
MPN: 7764921X13PC3

5331-01-199-4405 (77643-74X2)

NIIN: 01-199-4405
In stock
NSN: 5331-01-199-4405
FSC Code: 5331
MPN: 7764374X2

5331-01-202-2547 (77625-03X5)

NIIN: 01-202-2547
In stock
NSN: 5331-01-202-2547
FSC Code: 5331
MPN: 7762503X5

5331-00-990-4147 (77614-01X5PC12)

NIIN: 00-990-4147
In stock
NSN: 5331-00-990-4147
FSC Code: 5331
MPN: 7761401X5PC12

5331-01-480-9236 (3700089-013)

NIIN: 01-480-9236
In stock
NSN: 5331-01-480-9236
FSC Code: 5331
MPN: 3700089013

5331-99-751-2523 (AS43003-905)

NIIN: 99-751-2523
In stock
NSN: 5331-99-751-2523
FSC Code: 5331
MPN: AS43003905

5331-99-660-4550 (FBS68-C52)

NIIN: 99-660-4550
In stock
NSN: 5331-99-660-4550
FSC Code: 5331
MPN: FBS68C52

5331-99-606-5392 (36PG-6065392)

NIIN: 99-606-5392
In stock
NSN: 5331-99-606-5392
FSC Code: 5331
MPN: 36PG6065392

5331-01-447-4022 (36J0742)

NIIN: 01-447-4022
In stock
NSN: 5331-01-447-4022
FSC Code: 5331
MPN: 36J0742

5331-01-447-4026 (36J0747)

NIIN: 01-447-4026
In stock
NSN: 5331-01-447-4026
FSC Code: 5331
MPN: 36J0747

5331-01-447-9668 (PL1-38-175.0)

NIIN: 01-447-9668
In stock
NSN: 5331-01-447-9668
FSC Code: 5331
MPN: PL1381750

5331-01-273-9932 (7-755-445000)

NIIN: 01-273-9932
In stock
NSN: 5331-01-273-9932
FSC Code: 5331
MPN: 7755445000

5331-01-101-0778 (7-755-361000)

NIIN: 01-101-0778
In stock
NSN: 5331-01-101-0778
FSC Code: 5331
MPN: 7755361000

5331-01-273-9931 (7-755-266000)

NIIN: 01-273-9931
In stock
NSN: 5331-01-273-9931
FSC Code: 5331
MPN: 7755266000

5331-99-103-1633 (36BC1228)

NIIN: 99-103-1633
In stock
NSN: 5331-99-103-1633
FSC Code: 5331
MPN: 36BC1228

5331-01-208-1973 (77511-01X3)

NIIN: 01-208-1973
In stock
NSN: 5331-01-208-1973
FSC Code: 5331
MPN: 7751101X3

5331-99-101-6374 (743-101-6374)

NIIN: 99-101-6374
In stock
NSN: 5331-99-101-6374
FSC Code: 5331
MPN: 7431016374

5331-99-103-1634 (742-103-1634)

NIIN: 99-103-1634
In stock
NSN: 5331-99-103-1634
FSC Code: 5331
MPN: 7421031634

5331-01-463-2356 (36AR47)

NIIN: 01-463-2356
In stock
NSN: 5331-01-463-2356
FSC Code: 5331
MPN: 36AR47

5331-99-700-0008 (36AC1065)

NIIN: 99-700-0008
In stock
NSN: 5331-99-700-0008
FSC Code: 5331
MPN: 36AC1065

5331-99-700-0014 (36AC1306)

NIIN: 99-700-0014
In stock
NSN: 5331-99-700-0014
FSC Code: 5331
MPN: 36AC1306

5331-99-103-1637 (742-103-1637)

NIIN: 99-103-1637
In stock
NSN: 5331-99-103-1637
FSC Code: 5331
MPN: 7421031637

5331-99-700-0015 (H729-301777)

NIIN: 99-700-0015
In stock
NSN: 5331-99-700-0015
FSC Code: 5331
MPN: H729301777

5331-99-104-4410 (H729-301780)

NIIN: 99-104-4410
In stock
NSN: 5331-99-104-4410
FSC Code: 5331
MPN: H729301780

5331-99-453-6685 (BS1806-006S)

NIIN: 99-453-6685
In stock
NSN: 5331-99-453-6685
FSC Code: 5331
MPN: BS1806006S

5331-00-377-4115 (77445-12)

NIIN: 00-377-4115
In stock
NSN: 5331-00-377-4115
FSC Code: 5331
MPN: 7744512