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Technical Data Sheet
PartsTable / O-RING / W2T91951
W2T91951 ✓ 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 O-RING 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 5331-01-596-4597, 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
W2T91951
NSN: 5331-01-596-4597
FSC: 5331 — O-RING
CAGE: 89357 — EVOQUA WATER TECHNOLOGIES LLC (USA)
SPECIFICATIONS
Part NumberW2T91951
NSN5331-01-596-4597
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: W2T91951 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 14
4-010110BInterchangeable
interchangeable cross-reference
interchangeable
21110X4Interchangeable
interchangeable cross-reference
interchangeable
5061K12Interchangeable
interchangeable cross-reference
interchangeable
52-227-005Interchangeable
interchangeable cross-reference
interchangeable
GGG-C-105Interchangeable
interchangeable cross-reference
interchangeable
599-655-5Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is W2T91951?
W2T91951 is a O-RING.
What parts can replace W2T91951?
There are 14 known substitutes for W2T91951: 4-010110B, 21110X4, 5061K12 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for W2T91951?
W2T91951 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-596-4597. 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