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Technical Data Sheet
PartsTable / COMPONENT / 1520E21-31
1520E21-31 ✓ 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 PACKING,PREFORMED is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL, temp_rating: -30.0 FAHRENHEIT AND 250.0 FAHRENHEIT DEGF, hardness_rating: 70.0 SHORE DUROMETER A NOMINAL OVERALL, peripheral_diameter: 1.238 INCHES MINIMUM AND 1.270 INCHES MAXIMUM IN, center_hole_diameter: 1.104 INCHES MINIMUM AND 1.124 INCHES MAXIMUM IN, elongation_percentage: 331 MAXIMUM. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-359-3055, 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
1520E21-31
NSN: 5330-01-359-3055
FSC: 5330
CAGE: 94259 — FLUOR MARINE PROPULSION, LLC (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL
temp_rating-30.0 FAHRENHEIT AND 250.0 FAHRENHEIT DEGF
hardness_rating70.0 SHORE DUROMETER A NOMINAL OVERALL
special_featuresMATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
peripheral_diameter1.238 INCHES MINIMUM AND 1.270 INCHES MAXIMUM IN
center_hole_diameter1.104 INCHES MINIMUM AND 1.124 INCHES MAXIMUM IN
elongation_percentage331 MAXIMUM
cross-sectional_shape_styleO-RING
criticality_code_justificationFEAT
cross_section_outside_diameter0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
NSN5330-01-359-3055
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1520E21-31 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 SHAPE STYLE: O-RING
•
CROSS SECTION OUTSIDE DIAMETER: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
•
CRITICALITY CODE JUSTIFICATION: FEAT
•
TEMP RATING: -30.0 FAHRENHEIT AND 250.0 FAHRENHEIT DEGF
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL
•
CENTER HOLE DIAMETER: 1.104 INCHES MINIMUM AND 1.124 INCHES MAXIMUM IN
•
PERIPHERAL DIAMETER: 1.238 INCHES MINIMUM AND 1.270 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL SHAPE STYLEO-RING
CROSS SECTION OUTSIDE DIAMETER0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
CRITICALITY CODE JUSTIFICATIONFEAT
TEMP RATING-30.0 FAHRENHEIT AND 250.0 FAHRENHEIT DEGF
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL
CENTER HOLE DIAMETER1.104 INCHES MINIMUM AND 1.124 INCHES MAXIMUM IN
PERIPHERAL DIAMETER1.238 INCHES MINIMUM AND 1.270 INCHES MAXIMUM IN
SPECIAL FEATURESMATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
ELONGATION PERCENTAGE331 MAXIMUM
HARDNESS RATING70.0 SHORE DUROMETER A NOMINAL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
99180-24Interchangeable
interchangeable cross-reference
interchangeable
2-024-N219-7Interchangeable
interchangeable cross-reference
interchangeable
57327000Interchangeable
interchangeable cross-reference
interchangeable
N0674 2-024Interchangeable
Same NIIN cross-reference
interchangeable
820-5348176-12Interchangeable
Same NIIN cross-reference
interchangeable
AV-178-313-12Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1520E21-31?
1520E21-31 is a PACKING,PREFORMED.
What parts can replace 1520E21-31?
There are 6 known substitutes for 1520E21-31: 99180-24, 2-024-N219-7, 57327000 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1520E21-31?
1520E21-31 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-359-3055. 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