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81646 — FILTER,RADIO FREQUENCY INTERFERE

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

81646: FILTER,RADIO FREQUENCY INTERFERE.

FILTER,RADIO FREQUENCY INTERFERE. Key specifications include material: STEEL CORROSION RESISTING OVERALL, body_width: 4.750 INCHES MAXIMUM IN, body_height: 3.000 INCHES MAXIMUM IN, body_length: 8.000 INCHES MAXIMUM IN, body_material: METAL, inclosure_type: HERMETICALLY SEALED. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-420-0828, 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→ 81646
NSN: 4730-00-420-0828
NIINs: 004200828, 011567824, 013942755
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 62602 — MIDWEST HERMETRICS INC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
body_width4.750 INCHES MAXIMUM IN
body_height3.000 INCHES MAXIMUM IN
body_length8.000 INCHES MAXIMUM IN
body_materialMETAL
inclosure_typeHERMETICALLY SEALED
overall_length10.000 INCHES NOMINAL IN
inside_diameter0.625 INCHES NOMINAL IN
special_featuresU/O B52G/H ACFT
style_designatorRECTANGULAR TERMINAL/TERMINALS ON OPPOSITE SURFACES
body_surface_treatmentTIN
load_impedance_per_function50.0 OHMS 2ND RADIO INTERFERENCE SECOND FUNCTION
NSN4730-00-420-0828
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 81646 · 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
•
INSIDE DIAMETER: 0.625 INCHES NOMINAL IN
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
TECHNICAL CHARACTERISTICS
INSIDE DIAMETER0.625 INCHES NOMINAL IN
SPECIAL FEATURESU/O B52G/H ACFT
MATERIALSTEEL CORROSION RESISTING OVERALL
SUBSTITUTES & CROSS-REFERENCES 3
C 4163 618 -XSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
C41636180XSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
HF-16-SSReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 81646?
81646 is a FILTER,RADIO FREQUENCY INTERFERE. It is classified as a MRO (MRO_GENERAL).
What parts can replace 81646?
There are 3 known substitutes for 81646: C 4163 618 -X, C41636180X, HF-16-SS. Substitute compatibility should be verified for your specific system.
What is the NSN for 81646?
81646 is cataloged in the U.S. Government catalog under NSN 4730-00-420-0828. 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.