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4D321 — SPACER,RING

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

4D321: SPACER,RING.

The SPACER,RING is a the manufacturer industrial component. Key specifications include material: ALUMINUM, inside_diameter: 4.750 INCHES NOMINAL IN, outside_diameter: 5.250 INCHES NOMINAL IN, overall_thickness: 0.750 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5365-00-888-2513, 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
4D321
NSN: 5365-00-888-2513
FSC: 5365 — Bushings, Rings, Shims, and Spacers
CAGE: 26840 — HALE PRODUCTS, INC. (USA)
SPECIFICATIONS
materialALUMINUM
inside_diameter4.750 INCHES NOMINAL IN
outside_diameter5.250 INCHES NOMINAL IN
overall_thickness0.750 INCHES NOMINAL IN
NSN5365-00-888-2513
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SPACER,RING TITLE COMPONENT PN 4D321 MFR SPACER,RING
KEY FEATURES
•
OUTSIDE DIAMETER: 5.250 INCHES NOMINAL IN
•
OVERALL THICKNESS: 0.750 INCHES NOMINAL IN
•
INSIDE DIAMETER: 4.750 INCHES NOMINAL IN
•
MATERIAL: ALUMINUM
TECHNICAL CHARACTERISTICS
OUTSIDE DIAMETER5.250 INCHES NOMINAL IN
OVERALL THICKNESS0.750 INCHES NOMINAL IN
INSIDE DIAMETER4.750 INCHES NOMINAL IN
MATERIALALUMINUM
SUBSTITUTES & CROSS-REFERENCES 4
00330-0815Reference document
Same NSN cross-reference
Reference document — Secondary reference
321-0150-00-0Reference document
Same NSN cross-reference
Reference document — Secondary reference
330-0815Reference document
Same NSN cross-reference
Reference document — Secondary reference
321-0150-0Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4D321?
4D321 is a SPACER,RING.
What parts can replace 4D321?
There are 4 known substitutes for 4D321: 00330-0815, 321-0150-00-0, 330-0815 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4D321?
4D321 is cataloged in the U.S. Government catalog under NSN 5365-00-888-2513. 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.