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S8171B20 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

S8171B20: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER SILICONE CLASS Q, temp_rating: -85.0 FAHRENHEIT AND 401.0 FAHRENHEIT DEGF, hardness_rating: 50.0 SHORE DUROMETER A NOMINAL, center_hole_diameter: 3.969 INCHES MINIMUM AND 3.999 INCHES MAXIMUM IN, cross-sectional_height: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5331-00-313-0485, 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
S8171B20
NSN: 5331-00-313-0485
FSC: 5331 — O-ring
CAGE: 70210 — HONEYWELL INTERNATIONAL INC. DIV AEROSPACE - TORRANCE (USA)
SPECIFICATIONS
materialRUBBER SILICONE CLASS Q
temp_rating-85.0 FAHRENHEIT AND 401.0 FAHRENHEIT DEGF
hardness_rating50.0 SHORE DUROMETER A NOMINAL
center_hole_diameter3.969 INCHES MINIMUM AND 3.999 INCHES MAXIMUM IN
cross-sectional_height0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
NSN5331-00-313-0485
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: S8171B20 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
•
TEMP RATING: -85.0 FAHRENHEIT AND 401.0 FAHRENHEIT DEGF
•
CROSS-SECTIONAL HEIGHT: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
•
HARDNESS RATING: 50.0 SHORE DUROMETER A NOMINAL
•
CENTER HOLE DIAMETER: 3.969 INCHES MINIMUM AND 3.999 INCHES MAXIMUM IN
•
MATERIAL: RUBBER SILICONE CLASS Q
TECHNICAL CHARACTERISTICS
TEMP RATING-85.0 FAHRENHEIT AND 401.0 FAHRENHEIT DEGF
CROSS-SECTIONAL HEIGHT0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
HARDNESS RATING50.0 SHORE DUROMETER A NOMINAL
CENTER HOLE DIAMETER3.969 INCHES MINIMUM AND 3.999 INCHES MAXIMUM IN
MATERIALRUBBER SILICONE CLASS Q
OTHER ITEMS IN FSC 5331 — O-ring
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5331-00-001-1971 5331-00-001-1979 5331-00-001-3904 5331-00-001-3905 5331-00-001-3906 5331-00-001-3908 5331-00-001-3923 5331-00-001-3924
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is S8171B20?
S8171B20 is a O-RING.
What is the NSN for S8171B20?
S8171B20 is cataloged in the U.S. Government catalog under NSN 5331-00-313-0485. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.