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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.

5331-99-889-0401 (KT.3379)

NIIN: 99-889-0401
In stock
NSN: 5331-99-889-0401
FSC Code: 5331
MPN: KT3379

5331-01-561-7579 (KR0099)

NIIN: 01-561-7579
In stock
NSN: 5331-01-561-7579
FSC Code: 5331
MPN: KR0099

5331-01-568-2731 (KP77889)

NIIN: 01-568-2731
In stock
NSN: 5331-01-568-2731
FSC Code: 5331
MPN: KP77889

5331-01-568-2125 (KP77891)

NIIN: 01-568-2125
In stock
NSN: 5331-01-568-2125
FSC Code: 5331
MPN: KP77891

5331-12-164-4654 (KN12-1-3-5X72)

NIIN: 12-164-4654
In stock
NSN: 5331-12-164-4654
FSC Code: 5331
MPN: KN12135X72

5331-01-466-2407 (KK71GX-033)

NIIN: 01-466-2407
In stock
NSN: 5331-01-466-2407
FSC Code: 5331
MPN: KK71GX033

5331-01-555-6429 (KKA1121)

NIIN: 01-555-6429
In stock
NSN: 5331-01-555-6429
FSC Code: 5331
MPN: KKA1121

5331-01-477-7183 (KK71EW354)

NIIN: 01-477-7183
In stock
NSN: 5331-01-477-7183
FSC Code: 5331
MPN: KK71EW354

5331-01-452-8116 (KK71GX-218)

NIIN: 01-452-8116
In stock
NSN: 5331-01-452-8116
FSC Code: 5331
MPN: KK71GX218

5331-01-477-7188 (KK71EW352)

NIIN: 01-477-7188
In stock
NSN: 5331-01-477-7188
FSC Code: 5331
MPN: KK71EW352

5331-01-548-6382 (KK71EW904)

NIIN: 01-548-6382
In stock
NSN: 5331-01-548-6382
FSC Code: 5331
MPN: KK71EW904

5331-01-477-7193 (KK71EW234)

NIIN: 01-477-7193
In stock
NSN: 5331-01-477-7193
FSC Code: 5331
MPN: KK71EW234

5331-01-548-7407 (KK71EW143)

NIIN: 01-548-7407
In stock
NSN: 5331-01-548-7407
FSC Code: 5331
MPN: KK71EW143

5331-01-422-3857 (KHB-25)

NIIN: 01-422-3857
In stock
NSN: 5331-01-422-3857
FSC Code: 5331
MPN: KHB25

5331-01-441-2354 (KHB3K6NPT1114L)

NIIN: 01-441-2354
In stock
NSN: 5331-01-441-2354
FSC Code: 5331
MPN: KHB3K6NPT1114L

5331-01-441-3653 (KHB3K6NPT1114L)

NIIN: 01-441-3653
In stock
NSN: 5331-01-441-3653
FSC Code: 5331
MPN: KHB3K6NPT1114L

5331-01-422-4336 (KHB-25)

NIIN: 01-422-4336
In stock
NSN: 5331-01-422-4336
FSC Code: 5331
MPN: KHB25

5331-01-345-2506 (MR-B-1538-M)

NIIN: 01-345-2506
In stock
NSN: 5331-01-345-2506
FSC Code: 5331
MPN: MRB1538M

5331-01-428-4052 (KD007349)

NIIN: 01-428-4052
In stock
NSN: 5331-01-428-4052
FSC Code: 5331
MPN: KD007349

5331-01-428-4040 (KD007349)

NIIN: 01-428-4040
In stock
NSN: 5331-01-428-4040
FSC Code: 5331
MPN: KD007349

5331-01-427-9823 (KD007348)

NIIN: 01-427-9823
In stock
NSN: 5331-01-427-9823
FSC Code: 5331
MPN: KD007348

5331-01-427-9822 (KD007348)

NIIN: 01-427-9822
In stock
NSN: 5331-01-427-9822
FSC Code: 5331
MPN: KD007348

5331-01-428-4048 (KD007348)

NIIN: 01-428-4048
In stock
NSN: 5331-01-428-4048
FSC Code: 5331
MPN: KD007348

5331-01-428-4047 (KD007348)

NIIN: 01-428-4047
In stock
NSN: 5331-01-428-4047
FSC Code: 5331
MPN: KD007348

5331-01-421-8881 (KC004553)

NIIN: 01-421-8881
In stock
NSN: 5331-01-421-8881
FSC Code: 5331
MPN: KC004553

5331-01-421-8880 (KC004553)

NIIN: 01-421-8880
In stock
NSN: 5331-01-421-8880
FSC Code: 5331
MPN: KC004553

5331-01-424-9437 (KC004700)

NIIN: 01-424-9437
In stock
NSN: 5331-01-424-9437
FSC Code: 5331
MPN: KC004700

5331-01-566-0425 (KA158)

NIIN: 01-566-0425
In stock
NSN: 5331-01-566-0425
FSC Code: 5331
MPN: KA158

5331-01-360-6747 (K929727)

NIIN: 01-360-6747
In stock
NSN: 5331-01-360-6747
FSC Code: 5331
MPN: K929727

5331-01-460-7170 (K8-011-27)

NIIN: 01-460-7170
In stock
NSN: 5331-01-460-7170
FSC Code: 5331
MPN: K801127

5331-01-555-7077 (NTOR-2.5D)

NIIN: 01-555-7077
In stock
NSN: 5331-01-555-7077
FSC Code: 5331
MPN: NTOR25D

5331-01-401-3686 (K70-0097)

NIIN: 01-401-3686
In stock
NSN: 5331-01-401-3686
FSC Code: 5331
MPN: K700097

5331-01-449-9664 (K70-0125-8.190O)

NIIN: 01-449-9664
In stock
NSN: 5331-01-449-9664
FSC Code: 5331
MPN: K7001258190O

5331-01-513-2153 (K674360-11)

NIIN: 01-513-2153
In stock
NSN: 5331-01-513-2153
FSC Code: 5331
MPN: K67436011

5331-01-434-3031 (K-595-S6-R-66)

NIIN: 01-434-3031
In stock
NSN: 5331-01-434-3031
FSC Code: 5331
MPN: K595S6R66

5331-01-434-3044 (K-595-S6-R-66)

NIIN: 01-434-3044
In stock
NSN: 5331-01-434-3044
FSC Code: 5331
MPN: K595S6R66

5331-01-434-1733 (K-595-S6-R-66)

NIIN: 01-434-1733
In stock
NSN: 5331-01-434-1733
FSC Code: 5331
MPN: K595S6R66

5331-01-434-3038 (K-595-S6-R-66-PART)

NIIN: 01-434-3038
In stock
NSN: 5331-01-434-3038
FSC Code: 5331
MPN: K595S6R66PART

5331-01-434-1739 (K-590-CS-R-25)

NIIN: 01-434-1739
In stock
NSN: 5331-01-434-1739
FSC Code: 5331
MPN: K590CSR25

5331-01-434-1734 (K-595-S6-66)

NIIN: 01-434-1734
In stock
NSN: 5331-01-434-1734
FSC Code: 5331
MPN: K595S666

5331-01-434-3022 (K-590-CS-R-25)

NIIN: 01-434-3022
In stock
NSN: 5331-01-434-3022
FSC Code: 5331
MPN: K590CSR25

5331-01-434-3034 (K-595-S6-R-66)

NIIN: 01-434-3034
In stock
NSN: 5331-01-434-3034
FSC Code: 5331
MPN: K595S6R66

5331-01-387-2284 (K41RB72010)

NIIN: 01-387-2284
In stock
NSN: 5331-01-387-2284
FSC Code: 5331
MPN: K41RB72010

5331-01-352-8715 (K-2995-26)

NIIN: 01-352-8715
In stock
NSN: 5331-01-352-8715
FSC Code: 5331
MPN: K299526

5331-01-392-5783 (K232014)

NIIN: 01-392-5783
In stock
NSN: 5331-01-392-5783
FSC Code: 5331
MPN: K232014

5331-01-360-6748 (K205303)

NIIN: 01-360-6748
In stock
NSN: 5331-01-360-6748
FSC Code: 5331
MPN: K205303

5331-01-565-1815 (K-1509)

NIIN: 01-565-1815
In stock
NSN: 5331-01-565-1815
FSC Code: 5331
MPN: K1509

5331-01-469-8298 (K137)

NIIN: 01-469-8298
In stock
NSN: 5331-01-469-8298
FSC Code: 5331
MPN: K137