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639509-4 — PLATE,MOUNTING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

639509-4: PLATE,MOUNTING.

The PLATE,MOUNTING is a the manufacturer industrial component. Key specifications include shape: RECTANGULAR, width: 1.000 INCHES NOMINAL1.000 INCHES NOMINAL IN, length: 6.500 INCHES NOMINAL6.500 INCHES NOMINAL IN, material: NICKEL ALLOY, thickness: 0.125 INCHES NOMINAL0.125 INCHES NOMINAL IN, overall_width: 0.720 INCHES MINIMUM AND 0.840 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-509-6340, 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
639509-4
NSN: 5340-01-509-6340
NIINs: 015096340, 015096867, 015126092, 015234833
FSC: 5340 — Hardware, Commercial
CAGE: 31442 — NORTHROP GRUMMAN SYSTEMS CORPORATION DBA NORTHROP GRUMMAN SYSTEMS CORP (USA)
SPECIFICATIONS
shapeRECTANGULAR
width1.000 INCHES NOMINAL1.000 INCHES NOMINAL IN
length6.500 INCHES NOMINAL6.500 INCHES NOMINAL IN
materialNICKEL ALLOY
thickness0.125 INCHES NOMINAL0.125 INCHES NOMINAL IN
overall_width0.720 INCHES MINIMUM AND 0.840 INCHES MAXIMUM IN
overall_height1.125 INCHES NOMINAL IN
mounting_hole_typePLAIN
mounting_hole_diameter0.281 INCHES NOMINAL IN
mounting_hole_quantity1
end_item_identification0000LLCQA6597
material_document_and_classificationASTM-B443-2000E1 ASSN STD SINGLE MATERIAL RESPONSE
NSN5340-01-509-6340
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 639509-4 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
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 639509-4?
639509-4 is a PLATE,MOUNTING.
What is the NSN for 639509-4?
639509-4 is cataloged in the U.S. Government catalog under NSN 5340-01-509-6340. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.