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Technical Data Sheet
PartsTable / COMPONENT / 2643/CAT. 183
2643/CAT. 183 ✓ 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 2643/CAT. 183 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 5340-01-275-8044, 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
2643/CAT. 183
NSN: 5340-01-275-8044
FSC: 5340
CAGE: 28520 — HEYCO INC DBA HEYCO PRODUCTS (USA)
SPECIFICATIONS
Part Number2643/CAT. 183
NSN5340-01-275-8044
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 2643/CAT. 183 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
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESREADY FOR BACK TRANSFER; J6R; 2-24-2008.
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
2643Interchangeable
interchangeable cross-reference
interchangeable
2-541Interchangeable
interchangeable cross-reference
interchangeable
6674Interchangeable
interchangeable cross-reference
interchangeable
852EInterchangeable
interchangeable cross-reference
interchangeable
HC-10Interchangeable
interchangeable cross-reference
interchangeable
PA7966Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2643/CAT. 183?
2643/CAT. 183 is a 2643/CAT. 183.
What parts can replace 2643/CAT. 183?
There are 19 known substitutes for 2643/CAT. 183: 2643, 2-541, 6674 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 2643/CAT. 183?
2643/CAT. 183 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-275-8044. 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