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Technical Data Sheet
PartsTable / MRO / A7321
A7321 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

FILTER,RADIO FREQUENCY INTERFERE. Key specifications include width: 3.124 INCHES NOMINAL IN, height: 0.500 INCHES NOMINAL IN, length: 3.625 INCHES NOMINAL IN, material: STEEL, body_width: 10.000 INCHES NOMINAL IN, body_height: 2.500 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-371-4577, 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
MRO→ MRO_GENERAL→ A7321
NSN: 5340-00-371-4577
FSC: 5340
CAGE: 80749 — UNITED SPECIALTIES CO (USA)
SPECIFICATIONS
width3.124 INCHES NOMINAL IN
height0.500 INCHES NOMINAL IN
length3.625 INCHES NOMINAL IN
materialSTEEL
body_width10.000 INCHES NOMINAL IN
body_height2.500 INCHES NOMINAL IN
body_length10.000 INCHES NOMINAL IN
hole_diameter0.281 INCHES NOMINAL IN
inclosure_typeENCAPSULATED
overall_height2.500 INCHES NOMINAL IN
overall_length10.000 INCHES NOMINAL IN
style_designatorRECTANGULAR TERMINAL/TERMINALS ON TWO SURFACES
NSN5340-00-371-4577
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A7321 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
•
HOLE DIAMETER: 0.281 INCHES NOMINAL IN
•
LENGTH: 3.625 INCHES NOMINAL IN
•
MATERIAL: STEEL
•
WIDTH: 3.124 INCHES NOMINAL IN
•
HEIGHT: 0.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER0.281 INCHES NOMINAL IN
LENGTH3.625 INCHES NOMINAL IN
MATERIALSTEEL
WIDTH3.124 INCHES NOMINAL IN
HEIGHT0.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
6515NCM128151Upgraded Successor
successor cross-reference
successor
A19Upgraded Successor
successor cross-reference
successor
226671Upgraded Successor
successor cross-reference
successor
7321Interchangeable
interchangeable cross-reference
interchangeable
177003-60Interchangeable
interchangeable cross-reference
interchangeable
7321PWInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A7321?
A7321 is a FILTER,RADIO FREQUENCY INTERFERE. It is classified as a MRO (MRO_GENERAL).
What parts can replace A7321?
There are 22 known substitutes for A7321: 6515NCM128151, A19, 226671 and 19 more. Substitute compatibility should be verified for your specific system.
Is A7321 still available?
A7321 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026