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865509 — COUPLING HALF,SHAFT

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

865509: COUPLING HALF,SHAFT.

The COUPLING HALF,SHAFT is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY, body_style: 1 PERIPHERAL KEYWAY, THROUGH BORE, bore_shape: STRAIGHT, bore_length: 0.6360 INCHES NOMINAL IN, bore_diameter: 0.2037 INCHES NOMINAL IN, overall_length: 0.636 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-217-8734, 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
865509
NSN: 5340-00-217-8734
NIINs: 002178734, 003200581
FSC: 5340 — Hardware, Commercial
CAGE: 12603 — CLARK EQUIPMENT CO (USA)
SPECIFICATIONS
materialALUMINUM ALLOY
body_style1 PERIPHERAL KEYWAY, THROUGH BORE
bore_shapeSTRAIGHT
bore_length0.6360 INCHES NOMINAL IN
bore_diameter0.2037 INCHES NOMINAL IN
overall_length0.636 INCHES NOMINAL IN
outside_diameter1.120 INCHES NOMINAL IN
NSN5340-00-217-8734
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 865509 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
•
FIRST STEP DIAMETER: 1.1250 INCHES NOMINAL IN
•
END DIAMETER: 0.7500 INCHES NOMINAL IN
•
COUNTERSINK DIAMETER: 0.3750 INCHES NOMINAL IN
•
DISTANCE FROM END TO FIRST STEP: 0.5310 INCHES NOMINAL IN
•
DESIGN TYPE: SOLID
•
STYLE DESIGNATOR: SEAT
•
FEATURES PROVIDED: CASEHARDENED
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.7190 INCHES NOMINAL IN
FIRST STEP DIAMETER1.1250 INCHES NOMINAL IN
END DIAMETER0.7500 INCHES NOMINAL IN
COUNTERSINK DIAMETER0.3750 INCHES NOMINAL IN
DISTANCE FROM END TO FIRST STEP0.5310 INCHES NOMINAL IN
DESIGN TYPESOLID
STYLE DESIGNATORSEAT
FEATURES PROVIDEDCASEHARDENED
BORE DIAMETER0.5000 INCHES NOMINAL IN
MATERIALSTEEL
SUBSTITUTES & CROSS-REFERENCES 2
5540G9060Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
16448516423Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 865509?
865509 is a COUPLING HALF,SHAFT.
What parts can replace 865509?
There are 2 known substitutes for 865509: 5540G9060, 16448516423. Substitute compatibility should be verified for your specific system.
What is the NSN for 865509?
865509 is cataloged in the U.S. Government catalog under NSN 5340-00-217-8734. 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.