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Technical Data Sheet
PartsTable / COMPONENT / 257563-1
257563-1 ✓ 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

ADAPTER,STRAIGHT,FLANGE TO TUBE. Key specifications include material: STEEL CASE, duty_type: CONTINUOUS, body_style: CYLINDRICAL FRAME, body_length: 2.620 INCHES MAXIMUM IN, thread_class: 2A MOUNTING FACILITY BUSHING A, body_diameter: 1.500 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-349-1590, 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
257563-1
NSN: 4730-00-349-1590
FSC: 4730
CAGE: 72599 — ALLIEDSIGNAL INC DBA ALLIED-SIGNAL AEROSPACE CO (USA)
SPECIFICATIONS
materialSTEEL CASE
duty_typeCONTINUOUS
body_styleCYLINDRICAL FRAME
body_length2.620 INCHES MAXIMUM IN
thread_class2A MOUNTING FACILITY BUSHING A
body_diameter1.500 INCHES NOMINAL IN
actuator_length0.310 INCHES NOMINAL IN
actuator_diameter0.312 INCHES NOMINAL IN
nominal_thickness4.010 INCHES ALL ENDS IN
terminal_locationEND OPPOSITE ACTUATOR
nominal_thread_size0.625 INCHES MOUNTING FACILITY BUSHING IN
actuator_stroke_typePUSH
NSN4730-00-349-1590
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 257563-1 · 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
•
MATERIAL: STEEL COMP 304 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THICKNESS: 4.010 INCHES ALL ENDS IN
•
NOMINAL OUTSIDE DIAMETER: 5.621 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL COMP 304 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THICKNESS4.010 INCHES ALL ENDS IN
NOMINAL OUTSIDE DIAMETER5.621 INCHES ALL ENDS IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
257563-1Interchangeable
interchangeable cross-reference
interchangeable
15086Interchangeable
interchangeable cross-reference
interchangeable
257562-1Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 257563-1?
257563-1 is a ADAPTER,STRAIGHT,FLANGE TO TUBE.
What parts can replace 257563-1?
There are 3 known substitutes for 257563-1: 257563-1, 15086, 257562-1. Substitute compatibility should be verified for your specific system.
What is the NSN for 257563-1?
257563-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-349-1590. 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