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Technical Data Sheet
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5158-20 — Technical Data Sheet

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— · 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 GASKET is a the manufacturer industrial component. Key specifications include general_characteristics_item_description: 20.000 IN. O/A LG; SHOCK PROOF IN.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System under NSN 5330-00-774-4566, 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
5158-20
NSN: 5330-00-774-4566
FSC: 5330
CAGE: 63728 — SEALCRAFT CORPORATION (USA)
SPECIFICATIONS
general_characteristics_item_description20.000 IN. O/A LG; SHOCK PROOF IN
NSN5330-00-774-4566
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 5158-20 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: SOLID SINGLE OR COMPOSITION
•
APERTURE DIAMETER: 2.531 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.360 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-G-12803,+1141-A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: ASBESTOS AND RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL
•
OUTSIDE CORNER RADIUS: 0.380 INCHES NOMINAL IN
•
CROSS-SECTIONAL THICKNESS: 0.020 INCHES MINIMUM AND 0.026 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
APERTURE DIAMETER2.531 INCHES NOMINAL IN
HOLE DIAMETER0.360 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-12803,+1141-A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIALASBESTOS AND RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL
OUTSIDE CORNER RADIUS0.380 INCHES NOMINAL IN
CROSS-SECTIONAL THICKNESS0.020 INCHES MINIMUM AND 0.026 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
9540-20InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
9540InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
7744566InterchangeableGOVERNMENT REGISTRY
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5158-20?
5158-20 is a GASKET.
What parts can replace 5158-20?
There are 3 known substitutes for 5158-20: 9540-20, 9540, 7744566. Substitute compatibility should be verified for your specific system.
What is the NSN for 5158-20?
5158-20 is cataloged in the Federal Logistics Information System under NSN 5330-00-774-4566. 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: September 2026