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Technical Data Sheet
PartsTable / COMPONENT / 1646-B
1646-B ✓ 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 product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-228-0348, 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
1646-B
NSN: 4730-01-228-0348
FSC: 4730
CAGE: 57733 — STEWART-WARNER CORPORATION (USA)
SPECIFICATIONS
end_item_identificationKC-46 AIRCRAFT
criticality_code_justificationAGAV
reference_number_differentiating_characteristicsITEM IS FAA CERTIFIED
NSN4730-01-228-0348
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1646-B · 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 DIAMETER: 0.188 INCHES NOMINAL IN
•
HEIGHT: 0.703 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 0.375 INCHES NOMINAL IN
•
CRITICALITY CODE JUSTIFICATION: FEAT
•
ANGLE: 67.5 DEGREES
•
ASSEMBLY CLEARANCE RADIUS: 0.500 INCHES NOMINAL IN
•
STYLE DESIGNATOR: ANGLE
TECHNICAL CHARACTERISTICS (FLIS)
SHANK DIAMETER0.188 INCHES NOMINAL IN
HEIGHT0.703 INCHES NOMINAL IN
SPECIAL FEATURESSERRATED DRIVE SHANK
WIDTH ACROSS FLATS0.375 INCHES NOMINAL IN
CRITICALITY CODE JUSTIFICATIONFEAT
ANGLE67.5 DEGREES
ASSEMBLY CLEARANCE RADIUS0.500 INCHES NOMINAL IN
STYLE DESIGNATORANGLE
MATERIALSTEEL OVERALL
SHANK LENGTH0.218 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
74B450608-101Interchangeable
interchangeable cross-reference
interchangeable
1646Interchangeable
interchangeable cross-reference
interchangeable
701-2484736 P/N11Interchangeable
interchangeable cross-reference
interchangeable
1646-BInterchangeable
interchangeable cross-reference
interchangeable
1646-B1Interchangeable
interchangeable cross-reference
interchangeable
4730PL0890905Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1646-B?
1646-B is a FITTING,LUBRICATION.
What parts can replace 1646-B?
There are 7 known substitutes for 1646-B: 74B450608-101, 1646, 701-2484736 P/N11 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1646-B?
1646-B is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-228-0348. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026