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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.

5331-01-217-8969 (MLK-210)

NIIN: 01-217-8969
In stock
NSN: 5331-01-217-8969
FSC Code: 5331
MPN: MLK210

5331-01-217-8968 (MLK-103)

NIIN: 01-217-8968
In stock
NSN: 5331-01-217-8968
FSC Code: 5331
MPN: MLK103

5331-01-491-8853 (A34239-4714)

NIIN: 01-491-8853
In stock
NSN: 5331-01-491-8853
FSC Code: 5331
MPN: A342394714

5331-01-542-0445 (A-3395-26)

NIIN: 01-542-0445
In stock
NSN: 5331-01-542-0445
FSC Code: 5331
MPN: A339526

5331-01-463-9492 (A3266162-3)

NIIN: 01-463-9492
In stock
NSN: 5331-01-463-9492
FSC Code: 5331
MPN: A32661623

5331-01-470-6780 (A3266162-6)

NIIN: 01-470-6780
In stock
NSN: 5331-01-470-6780
FSC Code: 5331
MPN: A32661626

5331-01-470-6775 (A3266162-5)

NIIN: 01-470-6775
In stock
NSN: 5331-01-470-6775
FSC Code: 5331
MPN: A32661625

5331-01-470-6772 (A3266162-7)

NIIN: 01-470-6772
In stock
NSN: 5331-01-470-6772
FSC Code: 5331
MPN: A32661627

5331-01-458-4313 (A3266080)

NIIN: 01-458-4313
In stock
NSN: 5331-01-458-4313
FSC Code: 5331
MPN: A3266080

5331-01-463-9491 (A3266162-4)

NIIN: 01-463-9491
In stock
NSN: 5331-01-463-9491
FSC Code: 5331
MPN: A32661624

5331-01-458-4291 (A3266071)

NIIN: 01-458-4291
In stock
NSN: 5331-01-458-4291
FSC Code: 5331
MPN: A3266071

5331-01-463-9482 (A3266162-2)

NIIN: 01-463-9482
In stock
NSN: 5331-01-463-9482
FSC Code: 5331
MPN: A32661622

5331-01-463-9481 (A3266162-1)

NIIN: 01-463-9481
In stock
NSN: 5331-01-463-9481
FSC Code: 5331
MPN: A32661621

5331-01-458-4614 (A3266076)

NIIN: 01-458-4614
In stock
NSN: 5331-01-458-4614
FSC Code: 5331
MPN: A3266076

5331-01-466-5421 (A3266072)

NIIN: 01-466-5421
In stock
NSN: 5331-01-466-5421
FSC Code: 5331
MPN: A3266072

5331-01-464-1101 (A3259463-2)

NIIN: 01-464-1101
In stock
NSN: 5331-01-464-1101
FSC Code: 5331
MPN: A32594632

5331-01-560-4211 (A320112-9)

NIIN: 01-560-4211
In stock
NSN: 5331-01-560-4211
FSC Code: 5331
MPN: A3201129

5331-00-060-0554 (MIL-STD-129)

NIIN: 00-060-0554
In stock
NSN: 5331-00-060-0554
FSC Code: 5331
MPN: MILSTD129

5331-01-385-4458 (A3184990-5)

NIIN: 01-385-4458
In stock
NSN: 5331-01-385-4458
FSC Code: 5331
MPN: A31849905

5331-01-385-5215 (AS-568A-014)

NIIN: 01-385-5215
In stock
NSN: 5331-01-385-5215
FSC Code: 5331
MPN: AS568A014

5331-01-386-3910 (AS-568A-024)

NIIN: 01-386-3910
In stock
NSN: 5331-01-386-3910
FSC Code: 5331
MPN: AS568A024

5331-01-385-1048 (A3160185-1)

NIIN: 01-385-1048
In stock
NSN: 5331-01-385-1048
FSC Code: 5331
MPN: A31601851

5331-01-386-3916 (A3160134)

NIIN: 01-386-3916
In stock
NSN: 5331-01-386-3916
FSC Code: 5331
MPN: A3160134

5331-01-443-7674 (A3137593)

NIIN: 01-443-7674
In stock
NSN: 5331-01-443-7674
FSC Code: 5331
MPN: A3137593

5331-01-406-0483 (A3131644)

NIIN: 01-406-0483
In stock
NSN: 5331-01-406-0483
FSC Code: 5331
MPN: A3131644

5331-01-354-3212 (A3131390-4)

NIIN: 01-354-3212
In stock
NSN: 5331-01-354-3212
FSC Code: 5331
MPN: A31313904

5331-01-390-9623 (S63051139-3107)

NIIN: 01-390-9623
In stock
NSN: 5331-01-390-9623
FSC Code: 5331
MPN: S630511393107

5331-01-456-4310 (T332053910)

NIIN: 01-456-4310
In stock
NSN: 5331-01-456-4310
FSC Code: 5331
MPN: T332053910

5331-01-456-4311 (T230053910)

NIIN: 01-456-4311
In stock
NSN: 5331-01-456-4311
FSC Code: 5331
MPN: T230053910

5331-00-239-8458 (MILR900)

NIIN: 00-239-8458
In stock
NSN: 5331-00-239-8458
FSC Code: 5331
MPN: MILR900

5331-00-147-6153 (MIL-R-83248C)

NIIN: 00-147-6153
In stock
NSN: 5331-00-147-6153
FSC Code: 5331
MPN: MILR83248C

5331-00-570-0117 (MIL-R-83248/2-330)

NIIN: 00-570-0117
In stock
NSN: 5331-00-570-0117
FSC Code: 5331
MPN: MILR832482330

5331-01-252-1693 (MIL-R-83248/1)

NIIN: 01-252-1693
In stock
NSN: 5331-01-252-1693
FSC Code: 5331
MPN: MILR832481

5331-00-990-3217 (MIL-R-83248)

NIIN: 00-990-3217
In stock
NSN: 5331-00-990-3217
FSC Code: 5331
MPN: MILR83248

5331-00-163-1265 (MIL-R-83248)

NIIN: 00-163-1265
In stock
NSN: 5331-00-163-1265
FSC Code: 5331
MPN: MILR83248

5331-00-984-5757 (MIL-R-83248)

NIIN: 00-984-5757
In stock
NSN: 5331-00-984-5757
FSC Code: 5331
MPN: MILR83248

5331-00-618-0478 (MIL-R-7362D)

NIIN: 00-618-0478
In stock
NSN: 5331-00-618-0478
FSC Code: 5331
MPN: MILR7362D

5331-01-008-1961 (MILR7362-123ES)

NIIN: 01-008-1961
In stock
NSN: 5331-01-008-1961
FSC Code: 5331
MPN: MILR7362123ES

5331-00-526-9273 (MIL-R-6855)

NIIN: 00-526-9273
In stock
NSN: 5331-00-526-9273
FSC Code: 5331
MPN: MILR6855

5331-01-554-9574 (A3013096-14)

NIIN: 01-554-9574
In stock
NSN: 5331-01-554-9574
FSC Code: 5331
MPN: A301309614

5331-01-438-5451 (A3013096-3)

NIIN: 01-438-5451
In stock
NSN: 5331-01-438-5451
FSC Code: 5331
MPN: A30130963

5331-01-537-0197 (A3.4065-.75IN-ITEM)

NIIN: 01-537-0197
In stock
NSN: 5331-01-537-0197
FSC Code: 5331
MPN: A3406575INITEM

5331-99-131-8861 (A3.3712-7/1-1/2IN)

NIIN: 99-131-8861
In stock
NSN: 5331-99-131-8861
FSC Code: 5331
MPN: A337127112IN

5331-01-358-6581 (A3.230.148REF-4)

NIIN: 01-358-6581
In stock
NSN: 5331-01-358-6581
FSC Code: 5331
MPN: A3230148REF4

5331-99-363-1943 (A3.3712-7/2-7/2-1/2IN)

NIIN: 99-363-1943
In stock
NSN: 5331-99-363-1943
FSC Code: 5331
MPN: A33712727212IN

5331-01-537-0215 (A3.4065-1.250IN-ITEM)

NIIN: 01-537-0215
In stock
NSN: 5331-01-537-0215
FSC Code: 5331
MPN: A340651250INITEM

5331-99-666-1343 (A3.3712-7/2-1/2IN)

NIIN: 99-666-1343
In stock
NSN: 5331-99-666-1343
FSC Code: 5331
MPN: A337127212IN

5331-99-345-7112 (A3.3712-7/2-1/2IN)

NIIN: 99-345-7112
In stock
NSN: 5331-99-345-7112
FSC Code: 5331
MPN: A337127212IN