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PartsTable / COMPONENT / 10257-1
10257-1 ✓ 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

POLARIZING KEY,ELECTRICAL CONNEC. Key specifications include shape: IRREGULAR, material: COPPER ALLOY OVERALL, mesh_size: 60.0, head_style: HEADLESS (SETSCREW), point_style: CUP, thread_class: 3A A. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-037-4903, 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
10257-1
NSN: 4730-00-037-4903
FSC: 4730
CAGE: 99167 — HAMILTON SUNDSTRAND CORPORATION (USA)
SPECIFICATIONS
shapeIRREGULAR
materialCOPPER ALLOY OVERALL
mesh_size60.0
head_styleHEADLESS (SETSCREW)
point_styleCUP
thread_class3A A
overall_width0.034 INCHES NOMINAL IN
thread_length7.9 MILLIMETERS NOMINAL MM
wire_diameter0.00600 INCHES MINIMUM AND 0.00800 INCHES MAXIMUM IN
inclosure_typeOPEN
overall_height0.280 INCHES NOMINAL IN
overall_length0.150 INCHES NOMINAL IN
NSN4730-00-037-4903
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 10257-1 · 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
•
WIRE DIAMETER: 0.00600 INCHES MINIMUM AND 0.00800 INCHES MAXIMUM IN
•
MESH SIZE: 60.0
•
MATERIAL: STEEL CORROSION RESISTING
•
SURFACE TREATMENT: PASSIVATE
•
FILTERING MEDIA DESIGN: MESH
TECHNICAL CHARACTERISTICS (FLIS)
WIRE DIAMETER0.00600 INCHES MINIMUM AND 0.00800 INCHES MAXIMUM IN
MESH SIZE60.0
END ITEM IDENTIFICATIONFUEL CONTROL,ENGINE,ACFT
MATERIALSTEEL CORROSION RESISTING
SURFACE TREATMENTPASSIVATE
FILTERING MEDIA DESIGNMESH
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
89-975DInterchangeable
interchangeable cross-reference
interchangeable
102571Interchangeable
interchangeable cross-reference
interchangeable
FF-S-200B TY 1 ST 4Interchangeable
interchangeable cross-reference
interchangeable
5013522Interchangeable
interchangeable cross-reference
interchangeable
602-39Interchangeable
interchangeable cross-reference
interchangeable
0102571Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 10257-1?
10257-1 is a POLARIZING KEY,ELECTRICAL CONNEC.
What parts can replace 10257-1?
There are 8 known substitutes for 10257-1: 89-975D, 102571, FF-S-200B TY 1 ST 4 and 5 more. Substitute compatibility should be verified for your specific system.
Is 10257-1 still available?
10257-1 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