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ST7M257-275L200 — COUPLING,TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

ST7M257-275L200: COUPLING,TUBE.

The COUPLING,TUBE is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2014 OVERALL, connection_type: UNTHREADED INTERNAL TUBE ALL ENDSUNTHREADED INTERNAL TUBE ALL ENDS, connection_style: PLAIN (TUBE) ALL ENDSPLAIN (TUBE) ALL ENDS, style_designator: PLAIN W/TAPERED ENDS, surface_treatment: ANODIZE OUTSIDE, operating_pressure: 80.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-304-3559, 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
ST7M257-275L200
NSN: 4730-00-304-3559
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2014 OVERALL
connection_typeUNTHREADED INTERNAL TUBE ALL ENDSUNTHREADED INTERNAL TUBE ALL ENDS
connection_stylePLAIN (TUBE) ALL ENDSPLAIN (TUBE) ALL ENDS
style_designatorPLAIN W/TAPERED ENDS
surface_treatmentANODIZE OUTSIDE
operating_pressure80.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
maximum_operating_temp129.0 FAHRENHEIT SECOND RESPONSE129.0 FAHRENHEIT SECOND RESPONSE DEGF
nominal_overall_length2.000 INCHES IN
material_document_and_classificationQQ-A-225/4,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
nominal_outside_diameter_tube_accommodated2.750 INCHES ALL ENDS IN
surface_treatment_document_and_classificationMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDEMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE INSIDE
tubing_wall_nominal_thickness_for_which_designed0.203 INCHES ALL ENDS IN
NSN4730-00-304-3559
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: ST7M257-275L200 · 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 DOCUMENT AND CLASSIFICATION: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDE
•
CONNECTION STYLE: PLAIN (TUBE) ALL ENDSPLAIN (TUBE) ALL ENDS
•
TUBING WALL NOMINAL THICKNESS FOR WHICH DESIGNED: 0.203 INCHES ALL ENDS IN
•
NOMINAL OVERALL LENGTH: 2.000 INCHES IN
•
CONNECTION TYPE: UNTHREADED INTERNAL TUBE ALL ENDSUNTHREADED INTERNAL TUBE ALL ENDS
•
STYLE DESIGNATOR: PLAIN W/TAPERED ENDS
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-225/4,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDE
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDEMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE INSIDE
CONNECTION STYLEPLAIN (TUBE) ALL ENDSPLAIN (TUBE) ALL ENDS
TUBING WALL NOMINAL THICKNESS FOR WHICH DESIGNED0.203 INCHES ALL ENDS IN
NOMINAL OVERALL LENGTH2.000 INCHES IN
CONNECTION TYPEUNTHREADED INTERNAL TUBE ALL ENDSUNTHREADED INTERNAL TUBE ALL ENDS
STYLE DESIGNATORPLAIN W/TAPERED ENDS
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/4,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED2.750 INCHES ALL ENDS IN
OPERATING PRESSURE80.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES 2
10A309-275-200Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
ST7M257-275-200Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandDemilitarization required — critical (Q)
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FREQUENTLY ASKED QUESTIONS
What is ST7M257-275L200?
ST7M257-275L200 is a COUPLING,TUBE.
What parts can replace ST7M257-275L200?
There are 2 known substitutes for ST7M257-275L200: 10A309-275-200, ST7M257-275-200. Substitute compatibility should be verified for your specific system.
What is the NSN for ST7M257-275L200?
ST7M257-275L200 is cataloged in the U.S. Government catalog under NSN 4730-00-304-3559. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.