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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.

5331-01-537-1646 (25-855554-1)

NIIN: 01-537-1646
In stock
NSN: 5331-01-537-1646
FSC Code: 5331
MPN: 258555541

5331-01-528-9693 (25-851815)

NIIN: 01-528-9693
In stock
NSN: 5331-01-528-9693
FSC Code: 5331
MPN: 25851815

5331-01-528-9689 (25-851815-1)

NIIN: 01-528-9689
In stock
NSN: 5331-01-528-9689
FSC Code: 5331
MPN: 258518151

5331-01-561-8795 (25-846594)

NIIN: 01-561-8795
In stock
NSN: 5331-01-561-8795
FSC Code: 5331
MPN: 25846594

5331-01-572-7947 (25-841807)

NIIN: 01-572-7947
In stock
NSN: 5331-01-572-7947
FSC Code: 5331
MPN: 25841807

5331-01-572-7945 (25-832062)

NIIN: 01-572-7945
In stock
NSN: 5331-01-572-7945
FSC Code: 5331
MPN: 25832062

5331-01-512-0443 (25-832804)

NIIN: 01-512-0443
In stock
NSN: 5331-01-512-0443
FSC Code: 5331
MPN: 25832804

5331-01-197-6295 (635J782)

NIIN: 01-197-6295
In stock
NSN: 5331-01-197-6295
FSC Code: 5331
MPN: 635J782

5331-01-512-0476 (25-831985)

NIIN: 01-512-0476
In stock
NSN: 5331-01-512-0476
FSC Code: 5331
MPN: 25831985

5331-01-539-3120 (25-826152)

NIIN: 01-539-3120
In stock
NSN: 5331-01-539-3120
FSC Code: 5331
MPN: 25826152

5331-01-539-2692 (25-825579)

NIIN: 01-539-2692
In stock
NSN: 5331-01-539-2692
FSC Code: 5331
MPN: 25825579

5331-01-537-1661 (25-823533)

NIIN: 01-537-1661
In stock
NSN: 5331-01-537-1661
FSC Code: 5331
MPN: 25823533

5331-01-539-2492 (25-825579)

NIIN: 01-539-2492
In stock
NSN: 5331-01-539-2492
FSC Code: 5331
MPN: 25825579

5331-01-539-2690 (25-82274M)

NIIN: 01-539-2690
In stock
NSN: 5331-01-539-2690
FSC Code: 5331
MPN: 2582274M

5331-01-517-6317 (25-815460)

NIIN: 01-517-6317
In stock
NSN: 5331-01-517-6317
FSC Code: 5331
MPN: 25815460

5331-01-537-1746 (25-812641-1)

NIIN: 01-537-1746
In stock
NSN: 5331-01-537-1746
FSC Code: 5331
MPN: 258126411

5331-01-539-2375 (25-814496)

NIIN: 01-539-2375
In stock
NSN: 5331-01-539-2375
FSC Code: 5331
MPN: 25814496

5331-01-393-2907 (25-811528)

NIIN: 01-393-2907
In stock
NSN: 5331-01-393-2907
FSC Code: 5331
MPN: 25811528

5331-01-534-9524 (25-809872A1)

NIIN: 01-534-9524
In stock
NSN: 5331-01-534-9524
FSC Code: 5331
MPN: 25809872A1

5331-01-535-0510 (25-809880A1)

NIIN: 01-535-0510
In stock
NSN: 5331-01-535-0510
FSC Code: 5331
MPN: 25809880A1

5331-01-534-9533 (25-809872A2)

NIIN: 01-534-9533
In stock
NSN: 5331-01-534-9533
FSC Code: 5331
MPN: 25809872A2

5331-01-512-0370 (25-804536)

NIIN: 01-512-0370
In stock
NSN: 5331-01-512-0370
FSC Code: 5331
MPN: 25804536

5331-01-499-5037 (25-805732)

NIIN: 01-499-5037
In stock
NSN: 5331-01-499-5037
FSC Code: 5331
MPN: 25805732

5331-01-511-9190 (25-805063)

NIIN: 01-511-9190
In stock
NSN: 5331-01-511-9190
FSC Code: 5331
MPN: 25805063

5331-01-539-2743 (25-804093)

NIIN: 01-539-2743
In stock
NSN: 5331-01-539-2743
FSC Code: 5331
MPN: 25804093

5331-01-149-6228 (63549-1)

NIIN: 01-149-6228
In stock
NSN: 5331-01-149-6228
FSC Code: 5331
MPN: 635491

5331-01-177-8163 (6350-454-8)

NIIN: 01-177-8163
In stock
NSN: 5331-01-177-8163
FSC Code: 5331
MPN: 63504548

5331-01-545-6634 (6289E32-IT20)

NIIN: 01-545-6634
In stock
NSN: 5331-01-545-6634
FSC Code: 5331
MPN: 6289E32IT20

5331-01-524-2785 (2576F04ITEM8)

NIIN: 01-524-2785
In stock
NSN: 5331-01-524-2785
FSC Code: 5331
MPN: 2576F04ITEM8

5331-01-524-2784 (2576F04ITEM7)

NIIN: 01-524-2784
In stock
NSN: 5331-01-524-2784
FSC Code: 5331
MPN: 2576F04ITEM7

5331-01-524-2783 (2576F04ITEM6)

NIIN: 01-524-2783
In stock
NSN: 5331-01-524-2783
FSC Code: 5331
MPN: 2576F04ITEM6

5331-12-341-8877 (2575-025.696)

NIIN: 12-341-8877
In stock
NSN: 5331-12-341-8877
FSC Code: 5331
MPN: 2575025696

5331-12-312-4204 (2575-025.399)

NIIN: 12-312-4204
In stock
NSN: 5331-12-312-4204
FSC Code: 5331
MPN: 2575025399

5331-12-191-0639 (2575-063.873)

NIIN: 12-191-0639
In stock
NSN: 5331-12-191-0639
FSC Code: 5331
MPN: 2575063873

5331-01-098-9869 (634355C1)

NIIN: 01-098-9869
In stock
NSN: 5331-01-098-9869
FSC Code: 5331
MPN: 634355C1

5331-01-452-1500 (2570-AD2-22040)

NIIN: 01-452-1500
In stock
NSN: 5331-01-452-1500
FSC Code: 5331
MPN: 2570AD222040

5331-01-572-0129 (25-69756)

NIIN: 01-572-0129
In stock
NSN: 5331-01-572-0129
FSC Code: 5331
MPN: 2569756

5331-01-305-6013 (633L3061)

NIIN: 01-305-6013
In stock
NSN: 5331-01-305-6013
FSC Code: 5331
MPN: 633L3061

5331-01-295-1017 (633-C-7541)

NIIN: 01-295-1017
In stock
NSN: 5331-01-295-1017
FSC Code: 5331
MPN: 633C7541

5331-01-244-8696 (633NES1B)

NIIN: 01-244-8696
In stock
NSN: 5331-01-244-8696
FSC Code: 5331
MPN: 633NES1B

5331-01-512-0466 (25-67207)

NIIN: 01-512-0466
In stock
NSN: 5331-01-512-0466
FSC Code: 5331
MPN: 2567207

5331-01-572-0157 (25-67206001)

NIIN: 01-572-0157
In stock
NSN: 5331-01-572-0157
FSC Code: 5331
MPN: 2567206001

5331-01-305-9397 (633B1205)

NIIN: 01-305-9397
In stock
NSN: 5331-01-305-9397
FSC Code: 5331
MPN: 633B1205

5331-01-305-9398 (633B1173)

NIIN: 01-305-9398
In stock
NSN: 5331-01-305-9398
FSC Code: 5331
MPN: 633B1173

5331-01-305-6012 (633B1202)

NIIN: 01-305-6012
In stock
NSN: 5331-01-305-6012
FSC Code: 5331
MPN: 633B1202

5331-01-176-3924 (633-8304)

NIIN: 01-176-3924
In stock
NSN: 5331-01-176-3924
FSC Code: 5331
MPN: 6338304

5331-01-531-1860 (2564-00266)

NIIN: 01-531-1860
In stock
NSN: 5331-01-531-1860
FSC Code: 5331
MPN: 256400266

5331-01-176-3925 (633-8304)

NIIN: 01-176-3925
In stock
NSN: 5331-01-176-3925
FSC Code: 5331
MPN: 6338304