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Technical Data Sheet
PartsTable / COMPONENT / 1646B1
1646B1 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The FITTING,LUBRICATION is a the manufacturer industrial component. Key specifications include end_item_identification: KC-46 AIRCRAFT, criticality_code_justification: AGAV, reference_number_differentiating_characteristics: ITEM IS FAA CERTIFIED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-289-2928, 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
1646B1
NSN: 4730-00-289-2928
FSC: 4730
CAGE: 95879 — STEWART-WARNER ALEMITE CORP (USA)
SPECIFICATIONS
end_item_identificationKC-46 AIRCRAFT
criticality_code_justificationAGAV
reference_number_differentiating_characteristicsITEM IS FAA CERTIFIED
NSN4730-00-289-2928
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1646B1 · 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
•
HEIGHT: 0.703 INCHES NOMINAL IN
•
ANGLE: 65.0 DEGREES
•
WIDTH ACROSS FLATS: 0.375 INCHES NOMINAL IN
•
ASSEMBLY CLEARANCE RADIUS: 0.500 INCHES NOMINAL IN
•
CRITICALITY CODE JUSTIFICATION: FEAT
•
SURFACE TREATMENT: ZINC OVERALL
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
HEIGHT0.703 INCHES NOMINAL IN
SPECIAL FEATURESWEAPON SYSTEM ESSENTIAL
ANGLE65.0 DEGREES
WIDTH ACROSS FLATS0.375 INCHES NOMINAL IN
ASSEMBLY CLEARANCE RADIUS0.500 INCHES NOMINAL IN
CRITICALITY CODE JUSTIFICATIONFEAT
SURFACE TREATMENTZINC OVERALL
MATERIALSTEEL OVERALL
STYLE DESIGNATORANGLE
SHANK DIAMETER0.188 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
1646Interchangeable
interchangeable cross-reference
interchangeable
1747AInterchangeable
interchangeable cross-reference
interchangeable
E3156-3PC1646Interchangeable
interchangeable cross-reference
interchangeable
E3502PC2Interchangeable
interchangeable cross-reference
interchangeable
E-3602Interchangeable
interchangeable cross-reference
interchangeable
D0T46Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1646B1?
1646B1 is a FITTING,LUBRICATION.
What parts can replace 1646B1?
There are 25 known substitutes for 1646B1: 1646, 1747A, E3156-3PC1646 and 22 more. Substitute compatibility should be verified for your specific system.
Is 1646B1 still available?
1646B1 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