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Technical Data Sheet
21509N PART 30056 ✓ 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

SEAT,HELICAL COMPRESSION SPRING. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-374-2424, 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
21509N PART 30056
NSN: 5340-01-374-2424
FSC: 5340
CAGE: 35795 — LESLIE CONTROLS, INC. DBA LESLIE CONTROLS INC (USA)
SPECIFICATIONS
Part Number21509N PART 30056
NSN5340-01-374-2424
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 21509N PART 30056 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
1025FX1Interchangeable
interchangeable cross-reference
interchangeable
440592Interchangeable
interchangeable cross-reference
interchangeable
5D470Interchangeable
interchangeable cross-reference
interchangeable
10300992Interchangeable
interchangeable cross-reference
interchangeable
LYC505-08Interchangeable
interchangeable cross-reference
interchangeable
3005-6Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21509N PART 30056?
21509N PART 30056 is a SEAT,HELICAL COMPRESSION SPRING.
What parts can replace 21509N PART 30056?
There are 16 known substitutes for 21509N PART 30056: 1025FX1, 440592, 5D470 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21509N PART 30056?
21509N PART 30056 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-374-2424. This indicates validated use in U.S. government and defense supply chains.
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