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Technical Data Sheet
PartsTable / O-RING / 37.82X1.78 20A7
37.82X1.78 20A7 ✓ 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 37.82X1.78 20A7 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 5331-00-455-6405, 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
37.82X1.78 20A7
NSN: 5331-00-455-6405
FSC: 5331 — O-RING
CAGE: F8226 — STACEM (FRA)
SPECIFICATIONS
Part Number37.82X1.78 20A7
NSN5331-00-455-6405
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 37.82X1.78 20A7 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
•
CENTER HOLE DIAMETER: 1.479 INCHES MINIMUM AND 1.499 INCHES MAXIMUM IN
•
HARDNESS RATING: 90.0 SHORE DUROMETER A NOMINAL
•
MATERIAL: RUBBER
•
TEMP RATING: -30.0 FAHRENHEIT AND 250.0 FAHRENHEIT DEGF
•
OUTSIDE DIAMETER: 1.610 INCHES MINIMUM AND 1.648 INCHES MAXIMUM IN
•
ELONGATION PERCENTAGE: 331 MAXIMUM
•
CROSS-SECTIONAL HEIGHT: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE DIAMETER1.479 INCHES MINIMUM AND 1.499 INCHES MAXIMUM IN
HARDNESS RATING90.0 SHORE DUROMETER A NOMINAL
MATERIALRUBBER
TEMP RATING-30.0 FAHRENHEIT AND 250.0 FAHRENHEIT DEGF
OUTSIDE DIAMETER1.610 INCHES MINIMUM AND 1.648 INCHES MAXIMUM IN
ELONGATION PERCENTAGE331 MAXIMUM
CROSS-SECTIONAL HEIGHT0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
AS568-029NBRInterchangeable
interchangeable cross-reference
interchangeable
0221-12662-922 REF 34Interchangeable
interchangeable cross-reference
interchangeable
2-029 BUNA-NInterchangeable
interchangeable cross-reference
interchangeable
2574737-6Interchangeable
Same NIIN cross-reference
interchangeable
2-029 N674-70Interchangeable
Same NIIN cross-reference
interchangeable
2-029 N674-7Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 37.82X1.78 20A7?
37.82X1.78 20A7 is a 37.82X1.78 20A7.
What parts can replace 37.82X1.78 20A7?
There are 7 known substitutes for 37.82X1.78 20A7: AS568-029NBR, 0221-12662-922 REF 34, 2-029 BUNA-N and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 37.82X1.78 20A7?
37.82X1.78 20A7 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-455-6405. 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