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21A18 — HOSE,AIR DUCT

✓ Government record, cited
— · PIPE SECTION
PRODUCT OVERVIEW

21A18: HOSE,AIR DUCT.

The HOSE,AIR DUCT is a the manufacturer industrial component. Key specifications include material: STEEL AND COPPER ALLOY SECOND PLY, wall_thickness: 0.031 INCHES NOMINAL IN, connection_type: SOFT FIRST END, inside_diameter: 1.000 INCHES NOMINAL FIRST END IN, connection_style: ROUND FIRST END, style_designator: FULLY CONVOLUTED W/ WIRE RINGS BETWEEN CONVOLUTIONS. This part is cataloged in the U.S.

Government catalog under NSN 4720-01-314-9306, 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
21A18
NSN: 4720-01-314-9306
NIINs: 013149306, 014519387
FSC: 4720 — Hose and Flexible Tubing
CAGE: 14711 — RSA ENGINEERED PRODUCTS, LLC DBA RSA ENGINEERED PRODUCTS LLC (USA)
SPECIFICATIONS
materialSTEEL AND COPPER ALLOY SECOND PLY
wall_thickness0.031 INCHES NOMINAL IN
connection_typeSOFT FIRST END
inside_diameter1.000 INCHES NOMINAL FIRST END IN
connection_styleROUND FIRST END
style_designatorFULLY CONVOLUTED W/ WIRE RINGS BETWEEN CONVOLUTIONS
features_providedABRASION RESISTANT
end_overall_length1.500 INCHES NOMINAL FIRST END IN
operating_pressure65.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
end_inside_diameter1.000 INCHES NOMINAL FIRST END IN
end_item_identificationB-1B ACFT.
cross-sectional_shape_styleROUND
NSN4720-01-314-9306
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: 21A18 · 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
SUBSTITUTES & CROSS-REFERENCES 2
21A18-04C37-4Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LE271-0104Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
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 21A18?
21A18 is a HOSE,AIR DUCT.
What parts can replace 21A18?
There are 2 known substitutes for 21A18: 21A18-04C37-4, LE271-0104. Substitute compatibility should be verified for your specific system.
What is the NSN for 21A18?
21A18 is cataloged in the U.S. Government catalog under NSN 4720-01-314-9306. 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.