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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.

5331-01-455-3921 (9X7681)

NIIN: 01-455-3921
In stock
NSN: 5331-01-455-3921
FSC Code: 5331
MPN: 9X7681

5331-01-509-1988 (9X-7545)

NIIN: 01-509-1988
In stock
NSN: 5331-01-509-1988
FSC Code: 5331
MPN: 9X7545

5331-01-562-9905 (9X-7408)

NIIN: 01-562-9905
In stock
NSN: 5331-01-562-9905
FSC Code: 5331
MPN: 9X7408

5331-01-506-6950 (9X-6643)

NIIN: 01-506-6950
In stock
NSN: 5331-01-506-6950
FSC Code: 5331
MPN: 9X6643

5331-01-505-7246 (9X-0640)

NIIN: 01-505-7246
In stock
NSN: 5331-01-505-7246
FSC Code: 5331
MPN: 9X0640

5331-01-523-8898 (9U-8886)

NIIN: 01-523-8898
In stock
NSN: 5331-01-523-8898
FSC Code: 5331
MPN: 9U8886

5331-01-474-2258 (9R-2512)

NIIN: 01-474-2258
In stock
NSN: 5331-01-474-2258
FSC Code: 5331
MPN: 9R2512

5331-01-474-2164 (9R-2495)

NIIN: 01-474-2164
In stock
NSN: 5331-01-474-2164
FSC Code: 5331
MPN: 9R2495

5331-01-566-1117 (9N1756)

NIIN: 01-566-1117
In stock
NSN: 5331-01-566-1117
FSC Code: 5331
MPN: 9N1756

5331-01-492-8935 (9MB895)

NIIN: 01-492-8935
In stock
NSN: 5331-01-492-8935
FSC Code: 5331
MPN: 9MB895

5331-01-492-8938 (9MB851)

NIIN: 01-492-8938
In stock
NSN: 5331-01-492-8938
FSC Code: 5331
MPN: 9MB851

5331-01-091-8587 (MILR25897-916ES)

NIIN: 01-091-8587
In stock
NSN: 5331-01-091-8587
FSC Code: 5331
MPN: MILR25897916ES

5331-00-223-9961 (MILR25897ES)

NIIN: 00-223-9961
In stock
NSN: 5331-00-223-9961
FSC Code: 5331
MPN: MILR25897ES

5331-00-198-4440 (MIL-R-25897E)

NIIN: 00-198-4440
In stock
NSN: 5331-00-198-4440
FSC Code: 5331
MPN: MILR25897E

5331-00-604-1471 (MIL-R-25897)

NIIN: 00-604-1471
In stock
NSN: 5331-00-604-1471
FSC Code: 5331
MPN: MILR25897

5331-00-545-6180 (MILR25897-020ES)

NIIN: 00-545-6180
In stock
NSN: 5331-00-545-6180
FSC Code: 5331
MPN: MILR25897020ES

5331-01-091-9160 (MILR25897-904ES)

NIIN: 01-091-9160
In stock
NSN: 5331-01-091-9160
FSC Code: 5331
MPN: MILR25897904ES

5331-00-508-7952 (MILR25897-008ES)

NIIN: 00-508-7952
In stock
NSN: 5331-00-508-7952
FSC Code: 5331
MPN: MILR25897008ES

5331-01-542-1709 (9KK688)

NIIN: 01-542-1709
In stock
NSN: 5331-01-542-1709
FSC Code: 5331
MPN: 9KK688

5331-01-555-5113 (9J0705)

NIIN: 01-555-5113
In stock
NSN: 5331-01-555-5113
FSC Code: 5331
MPN: 9J0705

5331-00-451-0640 (MILR15624-008ES)

NIIN: 00-451-0640
In stock
NSN: 5331-00-451-0640
FSC Code: 5331
MPN: MILR15624008ES

5331-01-054-5477 (MILR15624-041ES)

NIIN: 01-054-5477
In stock
NSN: 5331-01-054-5477
FSC Code: 5331
MPN: MILR15624041ES

5331-01-058-4031 (MILR15624-335ES)

NIIN: 01-058-4031
In stock
NSN: 5331-01-058-4031
FSC Code: 5331
MPN: MILR15624335ES

5331-01-486-0787 (9J0707)

NIIN: 01-486-0787
In stock
NSN: 5331-01-486-0787
FSC Code: 5331
MPN: 9J0707

5331-01-054-9762 (MILR15624-008ES)

NIIN: 01-054-9762
In stock
NSN: 5331-01-054-9762
FSC Code: 5331
MPN: MILR15624008ES

5331-01-447-6514 (9GD)

NIIN: 01-447-6514
In stock
NSN: 5331-01-447-6514
FSC Code: 5331
MPN: 9GD

5331-01-377-2760 (9D7984)

NIIN: 01-377-2760
In stock
NSN: 5331-01-377-2760
FSC Code: 5331
MPN: 9D7984

5331-00-892-4158 (MILR1149TY1CL1)

NIIN: 00-892-4158
In stock
NSN: 5331-00-892-4158
FSC Code: 5331
MPN: MILR1149TY1CL1

5331-01-554-1809 (9D1248)

NIIN: 01-554-1809
In stock
NSN: 5331-01-554-1809
FSC Code: 5331
MPN: 9D1248

5331-01-559-7979 (9C6251)

NIIN: 01-559-7979
In stock
NSN: 5331-01-559-7979
FSC Code: 5331
MPN: 9C6251

5331-01-557-4131 (9C6250)

NIIN: 01-557-4131
In stock
NSN: 5331-01-557-4131
FSC Code: 5331
MPN: 9C6250

5331-01-480-0572 (99K000012B)

NIIN: 01-480-0572
In stock
NSN: 5331-01-480-0572
FSC Code: 5331
MPN: 99K000012B

5331-01-563-9729 (99K-6)

NIIN: 01-563-9729
In stock
NSN: 5331-01-563-9729
FSC Code: 5331
MPN: 99K6

5331-01-387-1429 (999D0479PC27A)

NIIN: 01-387-1429
In stock
NSN: 5331-01-387-1429
FSC Code: 5331
MPN: 999D0479PC27A

5331-01-388-1123 (999-5544)

NIIN: 01-388-1123
In stock
NSN: 5331-01-388-1123
FSC Code: 5331
MPN: 9995544

5331-01-538-1849 (999-4208-A-12-ITEM)

NIIN: 01-538-1849
In stock
NSN: 5331-01-538-1849
FSC Code: 5331
MPN: 9994208A12ITEM

5331-01-538-1854 (999-4208-A-12-ITEM)

NIIN: 01-538-1854
In stock
NSN: 5331-01-538-1854
FSC Code: 5331
MPN: 9994208A12ITEM

5331-01-538-1835 (999-4208-A-12-ITEM)

NIIN: 01-538-1835
In stock
NSN: 5331-01-538-1835
FSC Code: 5331
MPN: 9994208A12ITEM

5331-01-538-3098 (999-4208-A-12-ITEM)

NIIN: 01-538-3098
In stock
NSN: 5331-01-538-3098
FSC Code: 5331
MPN: 9994208A12ITEM

5331-01-466-0997 (9974M91P01)

NIIN: 01-466-0997
In stock
NSN: 5331-01-466-0997
FSC Code: 5331
MPN: 9974M91P01

5331-01-461-2192 (9-963-4-27)

NIIN: 01-461-2192
In stock
NSN: 5331-01-461-2192
FSC Code: 5331
MPN: 9963427

5331-01-351-8654 (99-567-0411)

NIIN: 01-351-8654
In stock
NSN: 5331-01-351-8654
FSC Code: 5331
MPN: 995670411

5331-01-352-7480 (99-4685015)

NIIN: 01-352-7480
In stock
NSN: 5331-01-352-7480
FSC Code: 5331
MPN: 994685015

5331-01-552-8521 (99-4684-04)

NIIN: 01-552-8521
In stock
NSN: 5331-01-552-8521
FSC Code: 5331
MPN: 99468404

5331-01-518-0784 (99-4346-152)

NIIN: 01-518-0784
In stock
NSN: 5331-01-518-0784
FSC Code: 5331
MPN: 994346152

5331-01-520-5996 (993-8788)

NIIN: 01-520-5996
In stock
NSN: 5331-01-520-5996
FSC Code: 5331
MPN: 9938788

5331-01-365-8124 (99-373-0147)

NIIN: 01-365-8124
In stock
NSN: 5331-01-365-8124
FSC Code: 5331
MPN: 993730147

5331-01-473-1974 (9-926-106247)

NIIN: 01-473-1974
In stock
NSN: 5331-01-473-1974
FSC Code: 5331
MPN: 9926106247