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Technical Data Sheet
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40-6521 — PIN,SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

40-6521: PIN,SPRING.

The PIN,SPRING is a the manufacturer industrial component. This part is cataloged in the U.S. Government catalog under NSN 5330-00-166-0054, 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
40-6521
NSN: 5330-00-166-0054
NIINs: 001660054, 013515468, 016548428
FSC: 5330 — Packing and Gasket Materials
CAGE: 57526 — FORD MOTOR COMPANY (USA)
SPECIFICATIONS
Part Number40-6521
NSN5330-00-166-0054
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 40-6521 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 2
5410MKReference document
Same NSN cross-reference
Reference document — Secondary reference
18765Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 40-6521?
40-6521 is a PIN,SPRING.
What parts can replace 40-6521?
There are 2 known substitutes for 40-6521: 5410MK, 18765. Substitute compatibility should be verified for your specific system.
What is the NSN for 40-6521?
40-6521 is cataloged in the U.S. Government catalog under NSN 5330-00-166-0054. This indicates validated use in U.S. government and defense supply chains.
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