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Technical Data Sheet
PartsTable / COMPONENT / 638643
638643 ✓ 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: ASBESTOS OVERALL, hole_diameter: 0.406 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, overall_width: 3.500 INCHES NOMINAL IN, style_designator: NON-CIRCULAR, aperture_diameter: 1.438 INCHES NOMINAL IN, bolt_circle_diameter: 2.688 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-256-6987, 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
638643
NSN: 5330-00-256-6987
FSC: 5330
CAGE: 34623 — AM GENERAL LLC (USA)
SPECIFICATIONS
materialASBESTOS OVERALL
hole_diameter0.406 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
overall_width3.500 INCHES NOMINAL IN
style_designatorNON-CIRCULAR
aperture_diameter1.438 INCHES NOMINAL IN
bolt_hole_quantity2
bolt_circle_diameter2.688 INCHES NOMINAL IN
outside_corner_radius0.406 INCHES NOMINAL IN
cross-sectional_thickness0.031 INCHES NOMINAL IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
side_radius_from_gasket_center1.094 INCHES NOMINAL IN
NSN5330-00-256-6987
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 638643 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
•
HOLE DIAMETER: 0.406 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
BOLT HOLE QUANTITY: 2
•
OUTSIDE CORNER RADIUS: 0.406 INCHES NOMINAL IN
•
STYLE DESIGNATOR: NON-CIRCULAR
•
SIDE RADIUS FROM GASKET CENTER: 1.094 INCHES NOMINAL IN
•
APERTURE DIAMETER: 1.438 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
OVERALL WIDTH3.500 INCHES NOMINAL IN
HOLE DIAMETER0.406 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
BOLT HOLE QUANTITY2
OUTSIDE CORNER RADIUS0.406 INCHES NOMINAL IN
STYLE DESIGNATORNON-CIRCULAR
SIDE RADIUS FROM GASKET CENTER1.094 INCHES NOMINAL IN
APERTURE DIAMETER1.438 INCHES NOMINAL IN
MATERIALASBESTOS OVERALL
CROSS-SECTIONAL THICKNESS0.031 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
20617Interchangeable
interchangeable cross-reference
interchangeable
17592Interchangeable
interchangeable cross-reference
interchangeable
R6180ZPC1AInterchangeable
interchangeable cross-reference
interchangeable
1909560Interchangeable
interchangeable cross-reference
interchangeable
C396Interchangeable
interchangeable cross-reference
interchangeable
43094Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 638643?
638643 is a GASKET.
What parts can replace 638643?
There are 21 known substitutes for 638643: 20617, 17592, R6180ZPC1A and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 638643?
638643 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-256-6987. 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