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Technical Data Sheet
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45055.9 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

45055.9: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. This part is cataloged in the U.S. Government catalog under NSN 5340-01-201-9003, 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
45055.9
NSN: 5340-01-201-9003
FSC: 5340 — Hardware, Commercial
CAGE: 60257 — EVALUATION RESEARCH CORP (USA)
SPECIFICATIONS
Part Number45055.9
NSN5340-01-201-9003
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 45055.9 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
5700031-020Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
W 14/2Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
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 45055.9?
45055.9 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace 45055.9?
There are 2 known substitutes for 45055.9: 5700031-020, W 14/2. Substitute compatibility should be verified for your specific system.
What is the NSN for 45055.9?
45055.9 is cataloged in the U.S. Government catalog under NSN 5340-01-201-9003. 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.