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Technical Data Sheet
PartsTable / COMPONENT / 638079
638079 ✓ 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 hole_diameter: 0.280 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, outside_diameter: 5.500 INCHES NOMINAL IN, style_designator: CIRCULAR, aperture_diameter: 4.062 INCHES NOMINAL IN, surface_treatment: ANODIZE OVERALL, bolt_hole_quantity: 12. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-901-0745, 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
638079
NSN: 5330-00-901-0745
FSC: 5330
CAGE: 83259 — PARKER-HANNIFIN CORPORATION DBA PNEUTRONICS DIV COMPOSITE SEALING SYSTEMS DIVISION (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 6061 AND RUBBER CHLOROPRENE CLASS CR AND RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR AND RUBBER BUTADIENE-STYRENE CLASS SBR OVERALL
hole_diameter0.280 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
outside_diameter5.500 INCHES NOMINAL IN
style_designatorCIRCULAR
aperture_diameter4.062 INCHES NOMINAL IN
surface_treatmentANODIZE OVERALL
bolt_hole_quantity12
gage_ring_thickness0.142 INCHES NOMINAL IN
bolt_circle_diameter4.750 INCHES NOMINAL IN
cross-sectional_thickness0.090 INCHES NOMINAL IN
cross-sectional_shape_styleMETAL AND SYNTHETIC RUBBER
surface_treatment_document_and_classificationMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5330-00-901-0745
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 638079 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
•
SURFACE TREATMENT: ANODIZE OVERALL
•
GAGE RING THICKNESS: 0.142 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 5.500 INCHES NOMINAL IN
•
CROSS-SECTIONAL THICKNESS: 0.090 INCHES NOMINAL IN
•
APERTURE DIAMETER: 4.062 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
BOLT CIRCLE DIAMETER: 4.750 INCHES NOMINAL IN
•
BOLT HOLE QUANTITY: 12
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTANODIZE OVERALL
GAGE RING THICKNESS0.142 INCHES NOMINAL IN
OUTSIDE DIAMETER5.500 INCHES NOMINAL IN
CROSS-SECTIONAL THICKNESS0.090 INCHES NOMINAL IN
APERTURE DIAMETER4.062 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
BOLT CIRCLE DIAMETER4.750 INCHES NOMINAL IN
BOLT HOLE QUANTITY12
MATERIALALUMINUM ALLOY 6061 AND RUBBER CHLOROPRENE CLASS CR AND RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR AND RUBBER BUTADIENE-STYRENE CLASS SBR OVERALL
HOLE DIAMETER0.280 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
L504002678Interchangeable
interchangeable cross-reference
interchangeable
39296Interchangeable
interchangeable cross-reference
interchangeable
40078Interchangeable
interchangeable cross-reference
interchangeable
58-23A2Interchangeable
interchangeable cross-reference
interchangeable
8909895Interchangeable
interchangeable cross-reference
interchangeable
4007&8HTInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 638079?
638079 is a GASKET.
What parts can replace 638079?
There are 13 known substitutes for 638079: L504002678, 39296, 40078 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 638079?
638079 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-901-0745. This indicates validated use in U.S. government and defense supply chains.
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Last verified: July 2026