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PartsTable / COMPONENT / AN737TW-56/66
AN737TW-56/66 ✓ 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 AN737TW-56/66 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-203-3131, 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
AN737TW-56/66
NSN: 4730-00-203-3131
FSC: 4730
CAGE: 5Z588 — APPLEGATE RALPH A (USA)
SPECIFICATIONS
Part NumberAN737TW-56/66
NSN4730-00-203-3131
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AN737TW-56/66 · 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
•
SURFACE TREATMENT: CADMIUM THUMBSCREW
•
MATERIAL: STEEL CORROSION RESISTING BAND
•
STYLE DESIGNATOR: BAND
•
FASTENING DEVICE TYPE: THUMB HEAD SCREW
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTCADMIUM THUMBSCREW
MATERIALSTEEL CORROSION RESISTING BAND
STYLE DESIGNATORBAND
MATERIALSTEEL THUMBSCREW
SPECIAL FEATURESGRUMMAN AEROSPACE CORP A10 AIRCRAFT
SURFACE TREATMENTPASSIVATE BAND
FASTENING DEVICE TYPETHUMB HEAD SCREW
OVERALL WIDTH0.500 INCHES MINIMUM AND 0.594 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,CL 1,TY 2 FED SPEC SINGLE TREATMENT RESPONSE THUMBSCREW
INSIDE DIAMETER1.328 INCHES MINIMUM AND 2.062 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 28
BUWEPSDWG2813697Interchangeable
interchangeable cross-reference
interchangeable
2813697Interchangeable
interchangeable cross-reference
interchangeable
AN737TW44-48Interchangeable
interchangeable cross-reference
interchangeable
HK9C24-44/48Interchangeable
interchangeable cross-reference
interchangeable
45D13-4Interchangeable
interchangeable cross-reference
interchangeable
AN737TW98-114Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN737TW-56/66?
AN737TW-56/66 is a AN737TW-56/66.
What parts can replace AN737TW-56/66?
There are 28 known substitutes for AN737TW-56/66: BUWEPSDWG2813697, 2813697, AN737TW44-48 and 25 more. Substitute compatibility should be verified for your specific system.
Is AN737TW-56/66 still available?
AN737TW-56/66 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