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521391 — COVER,PLAIN,DIFFUSE

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

521391: COVER,PLAIN,DIFFUSE.

The COVER,PLAIN,DIFFUSE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, inside_diameter: 0.230 INCHES MINIMUM AND 0.262 INCHES MAXIMUM IN, style_designator: CYLINDRICAL, surface_treatment: PHOSPHATE OVERALL, spring_free_length: 0.847 INCHES NOMINAL IN, coil_helix_direction: LEFT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5360-00-292-4122, 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
521391
NSN: 5360-00-292-4122
NIINs: 002924122, 009393413
FSC: 5360 — Coil, Flat, Leaf, and Wire Springs
CAGE: 82722 — WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORP DBA WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
inside_diameter0.230 INCHES MINIMUM AND 0.262 INCHES MAXIMUM IN
style_designatorCYLINDRICAL
surface_treatmentPHOSPHATE OVERALL
spring_free_length0.847 INCHES NOMINAL IN
coil_helix_directionLEFT-HAND
spring_free_outside_diameter0.312 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
NSN5360-00-292-4122
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available COVER,PLAIN,DIFFUSE TITLE COMPONENT PN 521391 MFR COVER,PLAIN,DIFFUSE
KEY FEATURES
•
SPRING FREE OUTSIDE DIAMETER: 0.312 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: CYLINDRICAL
•
SPRING FREE LENGTH: 0.847 INCHES NOMINAL IN
•
INSIDE DIAMETER: 0.230 INCHES MINIMUM AND 0.262 INCHES MAXIMUM IN
•
SURFACE TREATMENT: PHOSPHATE OVERALL
•
COIL HELIX DIRECTION: LEFT-HAND
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
SPRING FREE OUTSIDE DIAMETER0.312 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
STYLE DESIGNATORCYLINDRICAL
SPRING FREE LENGTH0.847 INCHES NOMINAL IN
INSIDE DIAMETER0.230 INCHES MINIMUM AND 0.262 INCHES MAXIMUM IN
SURFACE TREATMENTPHOSPHATE OVERALL
COIL HELIX DIRECTIONLEFT-HAND
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES 10
Y1016B2PC5Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
X1046D1PC35Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
Y1016C1PC5Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
Y1016C5PC5Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
562294Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
X1036F1PC35Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 521391?
521391 is a COVER,PLAIN,DIFFUSE.
What parts can replace 521391?
There are 10 known substitutes for 521391: Y1016B2PC5, X1046D1PC35, Y1016C1PC5 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 521391?
521391 is cataloged in the U.S. Government catalog under NSN 5360-00-292-4122. 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.