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Technical Data Sheet
PartsTable / COMPONENT / 121/90
121/90 ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The 121/90 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-209-8308, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
121/90
NSN: 5340-01-209-8308
FSC: 5340
CAGE: 25293 — ALLEN-STEVENS DRUM ACCESSORIES CORP (USA)
SPECIFICATIONS
Part Number121/90
NSN5340-01-209-8308
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 121/90 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
SEC857GInterchangeable
interchangeable cross-reference
interchangeable
B6259Interchangeable
interchangeable cross-reference
interchangeable
37161Interchangeable
interchangeable cross-reference
interchangeable
201PInterchangeable
interchangeable cross-reference
interchangeable
060-8Interchangeable
interchangeable cross-reference
interchangeable
B78565Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 121/90?
121/90 is a 121/90.
What parts can replace 121/90?
There are 15 known substitutes for 121/90: SEC857G, B6259, 37161 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 121/90?
121/90 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-209-8308. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026