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Technical Data Sheet
PartsTable / O-RING / 76NC243
76NC243 ✓ 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. Key specifications include material: RUBBER ISOBUTYLENE-ISOPRENE CLASS IIR, cross-sectional_height: 0.125 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-964-7291, 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
76NC243
NSN: 5331-00-964-7291
FSC: 5331 — O-RING
CAGE: 05214 — COMPUTER MACHINING TECHNOLOGY CORP (USA)
SPECIFICATIONS
materialRUBBER ISOBUTYLENE-ISOPRENE CLASS IIR
cross-sectional_height0.125 INCHES NOMINAL IN
NSN5331-00-964-7291
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 76NC243 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
KEY FEATURES
•
CROSS-SECTIONAL HEIGHT: 0.125 INCHES NOMINAL IN
•
MATERIAL: RUBBER ISOBUTYLENE-ISOPRENE CLASS IIR
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL HEIGHT0.125 INCHES NOMINAL IN
MATERIALRUBBER ISOBUTYLENE-ISOPRENE CLASS IIR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
MIL-STD-417AGR SC512ABFInterchangeable
interchangeable cross-reference
interchangeable
MIL-R-3065EInterchangeable
interchangeable cross-reference
interchangeable
00737SH 25 ST 164Interchangeable
interchangeable cross-reference
interchangeable
367486PC5Interchangeable
interchangeable cross-reference
interchangeable
734913PC27Interchangeable
interchangeable cross-reference
interchangeable
734913-27Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 76NC243?
76NC243 is a O-RING.
What parts can replace 76NC243?
There are 15 known substitutes for 76NC243: MIL-STD-417AGR SC512ABF, MIL-R-3065E, 00737SH 25 ST 164 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 76NC243?
76NC243 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-964-7291. 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