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21A18-04C43-5 — HOSE,AIR DUCT

✓ Government record, cited
— · PIPE SECTION
PRODUCT OVERVIEW

21A18-04C43-5: HOSE,AIR DUCT.

The HOSE,AIR DUCT is a the manufacturer industrial component. Key specifications include material: FIBERGLASS AND RUBBER SILICONE CLASS Q FIRST PLY, wall_thickness: 0.250 INCHES NOMINAL IN, connection_type: PLAIN BOTH ENDS, inside_diameter: 1.000 INCHES NOMINAL BOTH ENDS IN, connection_style: ROUND BOTH ENDS, outside_diameter: 1.250 INCHES NOMINAL BOTH ENDS IN. This part is cataloged in the U.S.

Government catalog under NSN 4720-01-535-0763, 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
21A18-04C43-5
NSN: 4720-01-535-0763
FSC: 4720 — Hose and Flexible Tubing
CAGE: 60980 — MEGGITT OREGON INC DBA MEGGITT OREGON INC DIV MEGGITT POLYMERS & COMPOSITES (USA)
SPECIFICATIONS
materialFIBERGLASS AND RUBBER SILICONE CLASS Q FIRST PLY
wall_thickness0.250 INCHES NOMINAL IN
connection_typePLAIN BOTH ENDS
inside_diameter1.000 INCHES NOMINAL BOTH ENDS IN
connection_styleROUND BOTH ENDS
outside_diameter1.250 INCHES NOMINAL BOTH ENDS IN
style_designatorFULLY CONVOLUTED W/ WIRE RINGS BETWEEN CONVOLUTIONS
end_overall_length1.250 INCHES NOMINAL BOTH ENDS IN
end_inside_diameter1.000 INCHES NOMINAL BOTH ENDS IN
end_item_identificationB-1B BOMBER AIRCRAFT
cross-sectional_shape_styleROUND
measuring_method_and_length10.750 INCHES NOMINAL OVERALL IN
NSN4720-01-535-0763
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: 21A18-04C43-5 · 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: 10.750 INCHES NOMINAL OVERALL IN
•
CONNECTION STYLE: ROUND BOTH ENDS
•
CONNECTION TYPE: PLAIN BOTH ENDS
•
STYLE DESIGNATOR: FULLY CONVOLUTED W/ WIRE RINGS BETWEEN CONVOLUTIONS
•
CROSS-SECTIONAL SHAPE STYLE: ROUND
•
WALL THICKNESS: 0.250 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 1.250 INCHES NOMINAL BOTH ENDS IN
•
INSIDE DIAMETER: 1.000 INCHES NOMINAL BOTH ENDS IN
TECHNICAL CHARACTERISTICS
MEASURING METHOD AND LENGTH10.750 INCHES NOMINAL OVERALL IN
CONNECTION STYLEROUND BOTH ENDS
CONNECTION TYPEPLAIN BOTH ENDS
STYLE DESIGNATORFULLY CONVOLUTED W/ WIRE RINGS BETWEEN CONVOLUTIONS
CROSS-SECTIONAL SHAPE STYLEROUND
WALL THICKNESS0.250 INCHES NOMINAL IN
OUTSIDE DIAMETER1.250 INCHES NOMINAL BOTH ENDS IN
INSIDE DIAMETER1.000 INCHES NOMINAL BOTH ENDS IN
END OVERALL LENGTH1.250 INCHES NOMINAL BOTH ENDS IN
END INSIDE DIAMETER1.000 INCHES NOMINAL BOTH ENDS IN
OTHER ITEMS IN FSC 4720 — Hose and Flexible Tubing
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4720-00-000-0080 4720-00-000-0081 4720-00-000-0084 4720-00-000-0724 4720-00-001-0014 4720-00-001-0015 4720-00-001-0023 4720-00-001-0025
SUBSTITUTES & CROSS-REFERENCES 1
LE271-0104-0533Same 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 21A18-04C43-5?
21A18-04C43-5 is a HOSE,AIR DUCT.
What parts can replace 21A18-04C43-5?
There is 1 known substitute for 21A18-04C43-5: LE271-0104-0533. Substitute compatibility should be verified for your specific system.
What is the NSN for 21A18-04C43-5?
21A18-04C43-5 is cataloged in the U.S. Government catalog under NSN 4720-01-535-0763. 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.