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ST7M311-4 — SLEEVE,FLARED,TUBE FITTING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

ST7M311-4: SLEEVE,FLARED,TUBE FITTING.

The SLEEVE,FLARED,TUBE FITTING is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660, flange_width: 0.141 INCHES NOMINAL IN, overall_length: 0.406 INCHES NOMINAL IN, style_designator: SLEEVE, seat_angle_in_deg: 33.0, surface_treatment: PASSIVATE. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-348-5325, 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
ST7M311-4
NSN: 4730-00-348-5325
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialIRON ALLOY 660
flange_width0.141 INCHES NOMINAL IN
overall_length0.406 INCHES NOMINAL IN
style_designatorSLEEVE
seat_angle_in_deg33.0
surface_treatmentPASSIVATE
casehardening_indicatorNOT CASEHARDENED
flange_outside_diameter0.383 INCHES NOMINAL IN
sleeve_outside_diameter0.297 INCHES NOMINAL IN
hose/tube_outside_diameter_for_which_designed0.250 INCHES NOMINAL IN
NSN4730-00-348-5325
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: ST7M311-4 · 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
•
SEAT ANGLE IN DEG: 33.0
•
STYLE DESIGNATOR: SLEEVE
•
SLEEVE OUTSIDE DIAMETER: 0.297 INCHES NOMINAL IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
SURFACE TREATMENT: PASSIVATE
•
FLANGE WIDTH: 0.141 INCHES NOMINAL IN
•
MATERIAL: IRON ALLOY 660
TECHNICAL CHARACTERISTICS
SEAT ANGLE IN DEG33.0
STYLE DESIGNATORSLEEVE
OVERALL LENGTH0.406 INCHES NOMINAL IN
SLEEVE OUTSIDE DIAMETER0.297 INCHES NOMINAL IN
CASEHARDENING INDICATORNOT CASEHARDENED
SURFACE TREATMENTPASSIVATE
FLANGE WIDTH0.141 INCHES NOMINAL IN
MATERIALIRON ALLOY 660
FLANGE OUTSIDE DIAMETER0.383 INCHES NOMINAL IN
HOSE/TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.250 INCHES NOMINAL IN
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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST7M311-4?
ST7M311-4 is a SLEEVE,FLARED,TUBE FITTING.
What is the NSN for ST7M311-4?
ST7M311-4 is cataloged in the U.S. Government catalog under NSN 4730-00-348-5325. 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.