PartsTable
Technical Data Sheet
5-1257 ✓ 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

TRANSFORMER,POWER AUTOTRANSFORME. Key specifications include material: STEEL COMP 301 OR STEEL CORROSION RESISTING BAND, body_width: 0.990 INCHES MINIMUM AND 1.050 INCHES MAXIMUM IN, body_height: 0.250 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN, body_length: 3.313 INCHES NOMINAL IN, overall_width: 0.625 INCHES NOMINAL IN, inclosure_type: FULLY INCLOSED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-047-9477, 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
5-1257
NSN: 4730-00-047-9477
FSC: 4730
CAGE: 00624 — EATON AEROQUIP LLC DBA JACKSON NORTH 1 DIV FLUID AND ELECTRICAL DISTRIBUTION (USA)
SPECIFICATIONS
materialSTEEL COMP 301 OR STEEL CORROSION RESISTING BAND
body_width0.990 INCHES MINIMUM AND 1.050 INCHES MAXIMUM IN
body_height0.250 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN
body_length3.313 INCHES NOMINAL IN
overall_width0.625 INCHES NOMINAL IN
inclosure_typeFULLY INCLOSED
inside_diameter10.500 INCHES MINIMUM AND 11.016 INCHES MAXIMUM IN
mounting_methodUNTHREADED HOLE(S) SINGLE GROUP
frequency_rating400.0 HERTZ MINIMUM AND 800.0 HERTZ MAXIMUM SINGLE COMPONENT
special_featuresW/TWO ANGLE BRACKETS ATTACHED TO BAND OD
style_designatorBAND
features_providedHERMETICALLY SEALED AND MONOLITHIC AND POSITIVE OUTPUTS AND HIGH VOLTAGE
NSN4730-00-047-9477
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 5-1257 · 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 NUT
FASTENING DEVICE TYPE: SELF-LOCKING HEXAGON NUT
INSIDE DIAMETER: 10.500 INCHES MINIMUM AND 11.016 INCHES MAXIMUM IN
STYLE DESIGNATOR: BAND
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL NUT
MATERIALSTEEL BOLT
SPECIAL FEATURESW/TWO ANGLE BRACKETS ATTACHED TO BAND OD
FASTENING DEVICE TYPESELF-LOCKING HEXAGON NUT
OVERALL WIDTH0.625 INCHES NOMINAL IN
INSIDE DIAMETER10.500 INCHES MINIMUM AND 11.016 INCHES MAXIMUM IN
STYLE DESIGNATORBAND
MATERIALSTEEL COMP 301 OR STEEL CORROSION RESISTING BAND
SURFACE TREATMENTPASSIVATE BAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
51257Interchangeable
interchangeable cross-reference
interchangeable
911411-10Interchangeable
interchangeable cross-reference
interchangeable
2-1257Interchangeable
interchangeable cross-reference
interchangeable
737118-01Interchangeable
interchangeable cross-reference
interchangeable
203-10290Interchangeable
interchangeable cross-reference
interchangeable
365C62-996SInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5-1257?
5-1257 is a TRANSFORMER,POWER AUTOTRANSFORME.
What parts can replace 5-1257?
There are 7 known substitutes for 5-1257: 51257, 911411-10, 2-1257 and 4 more. Substitute compatibility should be verified for your specific system.
Is 5-1257 still available?
5-1257 is currently cancelled.
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