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1641B — FILTER,RADIO FREQUENCY INTERFERE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

1641B: FILTER,RADIO FREQUENCY INTERFERE.

FILTER,RADIO FREQUENCY INTERFERE. Key specifications include height: 0.5469 INCHES NOMINAL IN, material: STEEL BODY, shank_length: 0.1875 INCHES NOMINAL IN, thread_class: 3B, special_features: MATERIAL IS COMP 12L14 STEEL., style_designator: STRAIGHT. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-050-4203, 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
1641B
NSN: 4730-00-050-4203
NIINs: 000504203, 016250199
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 57733 — STEWART-WARNER CORPORATION (USA)
SPECIFICATIONS
height0.5469 INCHES NOMINAL IN
materialSTEEL BODY
shank_length0.1875 INCHES NOMINAL IN
thread_class3B
special_featuresMATERIAL IS COMP 12L14 STEEL.
style_designatorSTRAIGHT
surface_treatmentZINC BODY
width_across_flats0.3125 INCHES NOMINAL IN
nominal_thread_size0.25 INCHES IN
thread_quantity_per_inch28
screw_thread_series_designatorUNF
part_name_assigned_by_controlling_agencyFITTING,GREASE
NSN4730-00-050-4203
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1641B · 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
SUBSTITUTES & CROSS-REFERENCES 9
122-660345 PC 30Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
200954Reference document
Same NSN cross-reference
Reference document — Secondary reference
122-5277738 ITEM 33Reference document
Same NSN cross-reference
Reference document — Secondary reference
AB1303-215Reference document
Same NSN cross-reference
Reference document — Secondary reference
87907S8Reference document
Same NSN cross-reference
Reference document — Secondary reference
78901-28Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1641B?
1641B is a FILTER,RADIO FREQUENCY INTERFERE.
What parts can replace 1641B?
There are 9 known substitutes for 1641B: 122-660345 PC 30, 200954, 122-5277738 ITEM 33 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1641B?
1641B is cataloged in the U.S. Government catalog under NSN 4730-00-050-4203. 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.