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NAS520 — HOSE,AIR DUCT

✓ Government record, cited
— · PIPE SECTION
PRODUCT OVERVIEW

NAS520: HOSE,AIR DUCT.

The HOSE,AIR DUCT is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC AND COTTON ALL PLIES, temp_rating: -65.0 FAHRENHEIT AND 450.0 FAHRENHEIT DEGF, wall_thickness: 0.030 INCHES MINIMUM AND 0.096 INCHES MAXIMUM IN, connection_type: PLAIN BOTH ENDS, inside_diameter: 4.0 INCHES NOMINAL BOTH ENDS IN, outside_diameter: 0.530 INCHES MINIMUM AND 0.596 INCHES MAXIMUM BOTH ENDS IN. This part is cataloged in the U.S.

Government catalog under NSN 4720-00-541-2499, 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
NAS520
NSN: 4720-00-541-2499
NIINs: 005412499, 005769799, 012053517, 012338057, 012338058, 014329014, 016037008, 016508782, 016508785, 016508786, 016508787, 016508788, 016508789, 016508790, 016508806, 016508815, 016508840
FSC: 4720 — Hose and Flexible Tubing
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC AND COTTON ALL PLIES
temp_rating-65.0 FAHRENHEIT AND 450.0 FAHRENHEIT DEGF
wall_thickness0.030 INCHES MINIMUM AND 0.096 INCHES MAXIMUM IN
connection_typePLAIN BOTH ENDS
inside_diameter4.0 INCHES NOMINAL BOTH ENDS IN
outside_diameter0.530 INCHES MINIMUM AND 0.596 INCHES MAXIMUM BOTH ENDS IN
special_featuresMATERIAL: RUBBER FLUOROSILICONE CLASS FQ OVERALL;CROSS-SECTIONAL LENGTH: 19.000 IN. NOM. IN
style_designatorSLEEVE SECTION
operating_pressure20.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
end_item_identificationF-35 AIRCRAFT
cross-sectional_shape_styleROUND
measuring_method_and_length8.0 INCHES NOMINAL OVERALL IN
NSN4720-00-541-2499
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: NAS520 · 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: 3.000 INCHES NOMINAL OVERALL IN
•
CONNECTION TYPE: PLAIN BOTH ENDS
•
STYLE DESIGNATOR: SLEEVE SECTION
•
MATERIAL DOCUMENT AND CLASSIFICATION: NAS522,TYPE 1 ASSN STD SINGLE MATERIAL RESPONSE ALL PLIES
•
CROSS-SECTIONAL SHAPE STYLE: ROUND
•
WALL THICKNESS: 0.030 INCHES MINIMUM AND 0.096 INCHES MAXIMUM IN
•
OPERATING PRESSURE: 20.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
•
SPECIFICATION/STANDARD DATA: 80205-NAS520 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
TECHNICAL CHARACTERISTICS
MEASURING METHOD AND LENGTH3.000 INCHES NOMINAL OVERALL IN
CONNECTION TYPEPLAIN BOTH ENDS
STYLE DESIGNATORSLEEVE SECTION
MATERIAL DOCUMENT AND CLASSIFICATIONNAS522,TYPE 1 ASSN STD SINGLE MATERIAL RESPONSE ALL PLIES
CROSS-SECTIONAL SHAPE STYLEROUND
WALL THICKNESS0.030 INCHES MINIMUM AND 0.096 INCHES MAXIMUM IN
OPERATING PRESSURE20.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
SPECIFICATION/STANDARD DATA80205-NAS520 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
INSIDE DIAMETER4.000 INCHES NOMINAL FIRST END IN
MATERIALRUBBER NATURAL SINGLE PLY
SUBSTITUTES & CROSS-REFERENCES 2
NAS522TYPE1Reference document
Same NSN cross-reference
Reference document — Secondary reference
NAS522Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is NAS520?
NAS520 is a HOSE,AIR DUCT.
What parts can replace NAS520?
There are 2 known substitutes for NAS520: NAS522TYPE1, NAS522. Substitute compatibility should be verified for your specific system.
What is the NSN for NAS520?
NAS520 is cataloged in the U.S. Government catalog under NSN 4720-00-541-2499. 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.