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A503-2 — FILTER,RADIO FREQUENCY INTERFERE

✓ Government record, cited
— · MRO · MRO_GENERAL
PRODUCT OVERVIEW

A503-2: FILTER,RADIO FREQUENCY INTERFERE.

FILTER,RADIO FREQUENCY INTERFERE. Key specifications include body_width: 2.970 INCHES MINIMUM AND 3.030 INCHES MAXIMUM IN, body_height: 2.220 INCHES MINIMUM AND 2.280 INCHES MAXIMUM IN, body_length: 3.970 INCHES MINIMUM AND 4.030 INCHES MAXIMUM IN, body_material: METAL, inclosure_type: ENCASED, overall_length: 5.350 INCHES MINIMUM AND 5.530 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-265-6825, 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→ A503-2
NSN: 4730-00-265-6825
NIINs: 002656825, 010872414, 012958470
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 36251 — MCNEIL OHIO CORP (USA)
SPECIFICATIONS
body_width2.970 INCHES MINIMUM AND 3.030 INCHES MAXIMUM IN
body_height2.220 INCHES MINIMUM AND 2.280 INCHES MAXIMUM IN
body_length3.970 INCHES MINIMUM AND 4.030 INCHES MAXIMUM IN
body_materialMETAL
inclosure_typeENCASED
overall_length5.350 INCHES MINIMUM AND 5.530 INCHES MAXIMUM IN
style_designatorRECTANGULAR TERMINAL/TERMINALS ON OPPOSITE SURFACES
nominal_thread_size0.164 INCHES IN
end_item_identification5820-01-223-8487 CONVERTER,SIGNAL
load_impedance_per_function50.0 OHMS 2ND RADIO INTERFERENCE SECOND FUNCTION
mounting_facility_type_and_quantity8 THREADED STUD(S) LOCATION NOT OTHERWISE SPECIFIED
source_impedance_rating_per_function50.0 OHMS 1ST RADIO INTERFERENCE FIRST FUNCTION
NSN4730-00-265-6825
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A503-2 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SHANK LENGTH: 0.234 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STRAIGHT
•
HEIGHT: 0.625 INCHES NOMINAL IN
•
SURFACE TREATMENT: CADMIUM OVERALL
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
SHANK LENGTH0.234 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT
HEIGHT0.625 INCHES NOMINAL IN
SPECIAL FEATURESTHROAT LOCATED BALL CHECK VALVE
SURFACE TREATMENTCADMIUM OVERALL
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES 9
Q3990Reference document
Same NSN cross-reference
Reference document — Secondary reference
A12762Reference document
Same NSN cross-reference
Reference document — Secondary reference
1778Reference document
Same NSN cross-reference
Reference document — Secondary reference
W4025CReference document
Same NSN cross-reference
Reference document — Secondary reference
126098Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
3MR8Reference document
Same NSN cross-reference
Reference document — Secondary 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 A503-2?
A503-2 is a FILTER,RADIO FREQUENCY INTERFERE. It is classified as a MRO (MRO_GENERAL).
What parts can replace A503-2?
There are 9 known substitutes for A503-2: Q3990, A12762, 1778 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A503-2?
A503-2 is cataloged in the U.S. Government catalog under NSN 4730-00-265-6825. This indicates validated use in U.S. government and defense supply chains.
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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.