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Technical Data Sheet
PartsTable / O-RING / 1240-95/56
1240-95/56 ✓ 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 1240-95/56 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 5331-00-788-3428, 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
1240-95/56
NSN: 5331-00-788-3428
FSC: 5331 — O-RING
CAGE: K5070 — DEVONPORT ROYAL DOCKYARD LIMITED, DEVONPORT ROYAL DOCKYARD (GBR)
SPECIFICATIONS
Part Number1240-95/56
NSN5331-00-788-3428
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1240-95/56 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
•
COLOR: BLACK
•
CENTER HOLE DIAMETER: 0.060 INCHES NOMINAL IN
•
MATERIAL: RUBBER SYNTHETIC
•
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS: SELECTED AND TESTED FOR USE ON ELECTROLYTIC OXYGEN-NITROGEN GENERATOR
•
CROSS-SECTIONAL HEIGHT: 0.062 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
COLORBLACK
CENTER HOLE DIAMETER0.060 INCHES NOMINAL IN
MATERIALRUBBER SYNTHETIC
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSSELECTED AND TESTED FOR USE ON ELECTROLYTIC OXYGEN-NITROGEN GENERATOR
CROSS-SECTIONAL HEIGHT0.062 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
SP-66Interchangeable
interchangeable cross-reference
interchangeable
PCT76Interchangeable
interchangeable cross-reference
interchangeable
12-890056Interchangeable
interchangeable cross-reference
interchangeable
1-892-1Interchangeable
interchangeable cross-reference
interchangeable
228-63-0666PCBMFInterchangeable
interchangeable cross-reference
interchangeable
13109-117PCBMFInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1240-95/56?
1240-95/56 is a 1240-95/56.
What parts can replace 1240-95/56?
There are 23 known substitutes for 1240-95/56: SP-66, PCT76, 12-890056 and 20 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1240-95/56?
1240-95/56 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-788-3428. 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