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Technical Data Sheet
PartsTable / O-RING / S81-3
S81-3 ✓ 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 S81-3 is a the manufacturer industrial component. Key specifications include color: BLACK, shank_style: STRAIGHT, overall_depth: 0.469 INCHES NOMINAL IN, shank_diameter: 0.750 INCHES NOMINAL IN, inside_diameter: 0.250 INCHES NOMINAL IN, outside_diameter: 1.375 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-582-1560, 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
S81-3
NSN: 5331-00-582-1560
FSC: 5331 — O-RING
CAGE: 11555 — HOUGHTON E F CANADA INC (CAN)
SPECIFICATIONS
colorBLACK
shank_styleSTRAIGHT
overall_depth0.469 INCHES NOMINAL IN
shank_diameter0.750 INCHES NOMINAL IN
inside_diameter0.250 INCHES NOMINAL IN
outside_diameter1.375 INCHES NOMINAL IN
screw_drive_typeHEXAGON SOCKET
style_designatorCROWN
attachment_methodSETSCREWS
overall_thickness0.688 INCHES NOMINAL IN
nominal_thread_size0.164 INCHES SCREW HOLE IN
setscrew_hole_quantity1
NSN5331-00-582-1560
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: S81-3 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: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 3.355 INCHES MINIMUM AND 3.419 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 3.085 INCHES MINIMUM AND 3.133 INCHES MAXIMUM IN
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL HEIGHT0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
OUTSIDE DIAMETER3.355 INCHES MINIMUM AND 3.419 INCHES MAXIMUM IN
CENTER HOLE DIAMETER3.085 INCHES MINIMUM AND 3.133 INCHES MAXIMUM IN
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 30
242E3R05Interchangeable
interchangeable cross-reference
interchangeable
922465-19Interchangeable
interchangeable cross-reference
interchangeable
62301-3Interchangeable
interchangeable cross-reference
interchangeable
2001 63Interchangeable
interchangeable cross-reference
interchangeable
44133Interchangeable
interchangeable cross-reference
interchangeable
150 63Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S81-3?
S81-3 is a S81-3.
What parts can replace S81-3?
There are 30 known substitutes for S81-3: 242E3R05, 922465-19, 62301-3 and 27 more. Substitute compatibility should be verified for your specific system.
Is S81-3 still available?
S81-3 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026