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Technical Data Sheet
PartsTable / O-RING / A1644-2 PIECE 42
A1644-2 PIECE 42 ✓ 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 5331-01-299-7322, 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
A1644-2 PIECE 42
NSN: 5331-01-299-7322
FSC: 5331 — O-RING
CAGE: 64392 — WEIL PUMP CO INC (USA)
SPECIFICATIONS
Part NumberA1644-2 PIECE 42
NSN5331-01-299-7322
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A1644-2 PIECE 42 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 13
4047Interchangeable
interchangeable cross-reference
interchangeable
X10586-2Interchangeable
interchangeable cross-reference
interchangeable
ADP4047Interchangeable
interchangeable cross-reference
interchangeable
B-3A1-4BInterchangeable
interchangeable cross-reference
interchangeable
A-846-6Interchangeable
interchangeable cross-reference
interchangeable
695224-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A1644-2 PIECE 42?
A1644-2 PIECE 42 is a O-RING.
What parts can replace A1644-2 PIECE 42?
There are 13 known substitutes for A1644-2 PIECE 42: 4047, X10586-2, ADP4047 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A1644-2 PIECE 42?
A1644-2 PIECE 42 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-299-7322. 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