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Technical Data Sheet
4904257 ✓ 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

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: PLASTIC, design_type: FRICTION, inside_diameter_length: 0.950 INCHES NOMINAL IN, round_cap_outside_surface_condition: SMOOTH, material_document_and_classification: L-P-390, TYPE 1, CLASS M, GRADE 1, CATEGORY 3 FED SPEC SINGLE MATERIAL RESPONSE, opening_inside_diameter_for_which_designed: 4.200 INCHES MINIMUM AND 4.520 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-139-2895, 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
4904257
NSN: 5340-01-139-2895
FSC: 5340
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialPLASTIC
design_typeFRICTION
inside_diameter_length0.950 INCHES NOMINAL IN
round_cap_outside_surface_conditionSMOOTH
material_document_and_classificationL-P-390, TYPE 1, CLASS M, GRADE 1, CATEGORY 3 FED SPEC SINGLE MATERIAL RESPONSE
opening_inside_diameter_for_which_designed4.200 INCHES MINIMUM AND 4.520 INCHES MAXIMUM IN
NSN5340-01-139-2895
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4904257 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
OPENING INSIDE DIAMETER FOR WHICH DESIGNED: 4.200 INCHES MINIMUM AND 4.520 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATION: L-P-390, TYPE 1, CLASS M, GRADE 1, CATEGORY 3 FED SPEC SINGLE MATERIAL RESPONSE
DESIGN TYPE: FRICTION
INSIDE DIAMETER LENGTH: 0.950 INCHES NOMINAL IN
ROUND CAP OUTSIDE SURFACE CONDITION: SMOOTH
MATERIAL: PLASTIC
TECHNICAL CHARACTERISTICS (FLIS)
OPENING INSIDE DIAMETER FOR WHICH DESIGNED4.200 INCHES MINIMUM AND 4.520 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONL-P-390, TYPE 1, CLASS M, GRADE 1, CATEGORY 3 FED SPEC SINGLE MATERIAL RESPONSE
DESIGN TYPEFRICTION
INSIDE DIAMETER LENGTH0.950 INCHES NOMINAL IN
ROUND CAP OUTSIDE SURFACE CONDITIONSMOOTH
MATERIALPLASTIC
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
TCF33-42SInterchangeable
interchangeable cross-reference
interchangeable
B545MILPRG23827Interchangeable
interchangeable cross-reference
interchangeable
B545Interchangeable
interchangeable cross-reference
interchangeable
D78021Interchangeable
interchangeable cross-reference
interchangeable
A17505PC25Interchangeable
interchangeable cross-reference
interchangeable
560-0004A REV AInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4904257?
4904257 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace 4904257?
There are 8 known substitutes for 4904257: TCF33-42S, B545MILPRG23827, B545 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4904257?
4904257 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-139-2895. This indicates validated use in U.S. government and defense supply chains.
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