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Technical Data Sheet
PartsTable / COMPONENT / 1A9749
1A9749 ✓ 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 material: HEMP OVERALL, hole_diameter: 0.438 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, outside_diameter: 4.875 INCHES NOMINAL IN, style_designator: CIRCULAR, aperture_diameter: 3.500 INCHES NOMINAL IN, bolt_circle_diameter: 4.125 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-145-1357, 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
1A9749
NSN: 5330-00-145-1357
FSC: 5330
CAGE: 95201 — NAPCO INTERNATIONAL LLC DBA NAPCO INTERNATIONAL INC (USA)
SPECIFICATIONS
materialHEMP OVERALL
hole_diameter0.438 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
outside_diameter4.875 INCHES NOMINAL IN
style_designatorCIRCULAR
aperture_diameter3.500 INCHES NOMINAL IN
bolt_hole_quantity3
bolt_circle_diameter4.125 INCHES NOMINAL IN
cross-sectional_thickness0.031 INCHES NOMINAL IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
NSN5330-00-145-1357
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1A9749 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
•
BOLT CIRCLE DIAMETER: 4.125 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 4.875 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: SOLID SINGLE OR COMPOSITION
•
MATERIAL: HEMP OVERALL
•
APERTURE DIAMETER: 3.500 INCHES NOMINAL IN
•
STYLE DESIGNATOR: CIRCULAR
•
CROSS-SECTIONAL THICKNESS: 0.031 INCHES NOMINAL IN
•
BOLT HOLE QUANTITY: 3
TECHNICAL CHARACTERISTICS (FLIS)
BOLT CIRCLE DIAMETER4.125 INCHES NOMINAL IN
OUTSIDE DIAMETER4.875 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
MATERIALHEMP OVERALL
APERTURE DIAMETER3.500 INCHES NOMINAL IN
STYLE DESIGNATORCIRCULAR
CROSS-SECTIONAL THICKNESS0.031 INCHES NOMINAL IN
BOLT HOLE QUANTITY3
HOLE DIAMETER0.438 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
N304-7-23Interchangeable
interchangeable cross-reference
interchangeable
68547Interchangeable
interchangeable cross-reference
interchangeable
N0304 2-425Interchangeable
interchangeable cross-reference
interchangeable
22-149Interchangeable
interchangeable cross-reference
interchangeable
PL-E185E001 PIECE 71Interchangeable
interchangeable cross-reference
interchangeable
IR263220Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1A9749?
1A9749 is a GASKET.
What parts can replace 1A9749?
There are 20 known substitutes for 1A9749: N304-7-23, 68547, N0304 2-425 and 17 more. Substitute compatibility should be verified for your specific system.
Is 1A9749 still available?
1A9749 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026