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7D0311 — HOSE ASSEMBLY,AIR BREATHING

✓ Government record, cited
— · PIPE SECTION
PRODUCT OVERVIEW

7D0311: HOSE ASSEMBLY,AIR BREATHING.

The HOSE ASSEMBLY,AIR BREATHING is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING REINFORCING WIRE, coupling_style: THREADED INTERNAL BOTH ENDS, connection_type: THREADED BOTH ENDS, inside_diameter: 0.292 INCHES NOMINAL FIRST END IN, special_features: CONNECTION TYPE: GROUND JOINT EXTERNALLY THREADED TAILPIECE W/UNION NUT BOTH ENDS, style_designator: HELICALLY WOUND CONTINOUS WIRE SUPPORTED. This part is cataloged in the U.S.

Government catalog under NSN 4720-01-417-5844, 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
7D0311
NSN: 4720-01-417-5844
FSC: 4720 — Hose and Flexible Tubing
CAGE: 88277 — THE BOEING COMPANY (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING REINFORCING WIRE
coupling_styleTHREADED INTERNAL BOTH ENDS
connection_typeTHREADED BOTH ENDS
inside_diameter0.292 INCHES NOMINAL FIRST END IN
special_featuresCONNECTION TYPE: GROUND JOINT EXTERNALLY THREADED TAILPIECE W/UNION NUT BOTH ENDS
style_designatorHELICALLY WOUND CONTINOUS WIRE SUPPORTED
surface_treatmentPASSIVATE REINFORCING WIRE
operating_pressure125.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
nominal_thread_size0.500 INCHES BOTH ENDS IN
end_item_identificationAIRCRAFT,AIRLIFTER C-17A A
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) BOTH ENDS
cross-sectional_shape_styleROUND
NSN4720-01-417-5844
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: 7D0311 · OEM ⚠ VERIFY BEFORE ORDERING Schedule = wall thickness, NOT pipe diameter. Sch 40 and Sch 80 have the same OD but different wall thickness. Nominal pipe size ≠ actual OD — a 1" pipe is actually 1.315" OD ✓ BROKER TIP Sch 40 = standard wall, Sch 80 = heavy wall (higher pressure), Sch 160 = extra heavy. Seamless pipe is required for high-pressure applications — welded pipe has lower ratings PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MEASURING METHOD AND LENGTH: 72.000 INCHES NOMINAL OVERALL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE BOTH END COUPLINGS
•
MINIMUM INSIDE BENDING RADIUS: 1.000 INCHES IN
•
CONNECTION TYPE: THREADED BOTH ENDS
•
STYLE DESIGNATOR: HELICALLY WOUND CONTINOUS WIRE SUPPORTED
•
COUPLING STYLE: THREADED INTERNAL BOTH ENDS
•
MATERIAL DOCUMENT AND CLASSIFICATION: ZZ-R-765,CLASS 2A,GRADE 70 FED SPEC SINGLE MATERIAL RESPONSE FIRST PLY A
TECHNICAL CHARACTERISTICS
MEASURING METHOD AND LENGTH72.000 INCHES NOMINAL OVERALL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE BOTH END COUPLINGS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OR MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE REINFORCING WIRE
MINIMUM INSIDE BENDING RADIUS1.000 INCHES IN
CONNECTION TYPETHREADED BOTH ENDS
STYLE DESIGNATORHELICALLY WOUND CONTINOUS WIRE SUPPORTED
COUPLING STYLETHREADED INTERNAL BOTH ENDS
MATERIAL DOCUMENT AND CLASSIFICATIONZZ-R-765,CLASS 2A,GRADE 70 FED SPEC SINGLE MATERIAL RESPONSE FIRST PLY A
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A313 ASSN STD SINGLE MATERIAL RESPONSE REINFORCING WIRE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE BOTH END COUPLINGS
SUBSTITUTES & CROSS-REFERENCES 2
55104Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
7D0311C0720ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 7D0311?
7D0311 is a HOSE ASSEMBLY,AIR BREATHING.
What parts can replace 7D0311?
There are 2 known substitutes for 7D0311: 55104, 7D0311C0720A. Substitute compatibility should be verified for your specific system.
What is the NSN for 7D0311?
7D0311 is cataloged in the U.S. Government catalog under NSN 4720-01-417-5844. 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.