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1643698 — PNEUMATIC MUFFLER,EXHAUST-INTAKE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

1643698: PNEUMATIC MUFFLER,EXHAUST-INTAKE.

PNEUMATIC MUFFLER,EXHAUST-INTAKE. Key specifications include special_features: NEXT HIGHER ASSY IS AN AIR SYSTEM, end_item_identification: 3990-01-443-8024 DUMP BODY, DEMOU, XM6, part_name_assigned_by_controlling_agency: MUFFLER EXHAUST 1/8 NPT. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-538-5837, 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
1643698
NSN: 4730-01-538-5837
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 5X050 — CRYSTEEL MANUFACTURING, INC DBA CRYSTEEL MANUFACTURING INC (USA)
SPECIFICATIONS
special_featuresNEXT HIGHER ASSY IS AN AIR SYSTEM
end_item_identification3990-01-443-8024 DUMP BODY, DEMOU, XM6
part_name_assigned_by_controlling_agencyMUFFLER EXHAUST 1/8 NPT
NSN4730-01-538-5837
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1643698 · 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
TECHNICAL CHARACTERISTICS
SPECIAL FEATURESNEXT HIGHER ASSY IS AN AIR SYSTEM
PART NAME ASSIGNED BY CONTROLLING AGENCYMUFFLER EXHAUST 1/8 NPT
END ITEM IDENTIFICATION3990-01-443-8024 DUMP BODY, DEMOU, XM6
SUBSTITUTES & CROSS-REFERENCES 1
403835Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1643698?
1643698 is a PNEUMATIC MUFFLER,EXHAUST-INTAKE.
What parts can replace 1643698?
There is 1 known substitute for 1643698: 403835. Substitute compatibility should be verified for your specific system.
What is the NSN for 1643698?
1643698 is cataloged in the U.S. Government catalog under NSN 4730-01-538-5837. 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.