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PartsTable / COMPONENT / A-1991A
A-1991A ✓ 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 GASKET is a the manufacturer industrial component. Key specifications include outside_diameter: 4.812 INCHES NOMINAL IN, style_designator: CIRCULAR, aperture_diameter: 4.188 INCHES NOMINAL IN, material_document_and_classification: GARLOCK 2900, CAGEC 73680 MFR REF SINGLE MATERIAL RESPONSE OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-399-7044, 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
A-1991A
NSN: 5330-01-399-7044
FSC: 5330
CAGE: 34294 — KRAISSL CO INC THE (USA)
SPECIFICATIONS
outside_diameter4.812 INCHES NOMINAL IN
style_designatorCIRCULAR
aperture_diameter4.188 INCHES NOMINAL IN
material_document_and_classificationGARLOCK 2900, CAGEC 73680 MFR REF SINGLE MATERIAL RESPONSE OVERALL
NSN5330-01-399-7044
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A-1991A 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
•
APERTURE DIAMETER: 4.188 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 4.812 INCHES NOMINAL IN
•
STYLE DESIGNATOR: CIRCULAR
•
MATERIAL DOCUMENT AND CLASSIFICATION: GARLOCK 2900, CAGEC 73680 MFR REF SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
APERTURE DIAMETER4.188 INCHES NOMINAL IN
OUTSIDE DIAMETER4.812 INCHES NOMINAL IN
STYLE DESIGNATORCIRCULAR
MATERIAL DOCUMENT AND CLASSIFICATIONGARLOCK 2900, CAGEC 73680 MFR REF SINGLE MATERIAL RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
A72135Interchangeable
interchangeable cross-reference
interchangeable
72135Interchangeable
interchangeable cross-reference
interchangeable
5310009992291Interchangeable
interchangeable cross-reference
interchangeable
9414418Interchangeable
interchangeable cross-reference
interchangeable
6515NCM082590Interchangeable
interchangeable cross-reference
interchangeable
8258Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A-1991A?
A-1991A is a GASKET.
What parts can replace A-1991A?
There are 7 known substitutes for A-1991A: A72135, 72135, 5310009992291 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A-1991A?
A-1991A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-399-7044. 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