PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

5621Hose,air Duct

Flexco, Inc · NSN 4720-00-541-0747 · FSC 4720 · No Item Name Available
Verified by PartsTable
NSN 4720-00-541-0747 — this item is cataloged by the U.S. Government under National Stock Number 4720-00-541-0747. Primary manufacturer part number: 5621.
Features
  • Hose,air Duct — FSC 4720
  • Inside Diameter: 3.000 INCHES NOMINAL FIRST END IN
  • Connection Type: SOFT BOTH ENDS
  • Connection Style: ROUND BOTH ENDS
  • Minimum Inside Bending Radius: 4.500 INCHES IN
  • Operating Pressure: 2.5 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
  • Measuring Method and Length: 13.750 INCHES NOMINAL OVERALL IN
  • Material: COTTON AND RUBBER CHLOROPRENE CLASS CR SECOND PLY
Applications
  • Fluid conveyance
  • Hydraulic system plumbing
  • Pneumatic line routing
  • Applications requiring Cotton and Rubber Chloroprene Class Cr Second Ply construction
General Description

The Hose,air Duct, cataloged under National Stock Number 4720-00-541-0747, is classified within Federal Supply Class 4720 (No Item Name Available) of the Pipe, Tubing, Hose, and Fittings group. The primary manufacturer of record is Flexco, Inc. Government technical data includes 16 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4720-00-541-0747
Primary Part Number5621
Item NameHose,air Duct
FSC / FSG4720 / 47 — No Item Name Available
ManufacturerFlexco, Inc
StatusACTIVE
Inside Diameter3.000 INCHES NOMINAL FIRST END IN
Connection TypeSOFT BOTH ENDS
Connection StyleROUND BOTH ENDS
Minimum Inside Bending Radius4.500 INCHES IN
Operating Pressure2.5 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
Measuring Method and Length13.750 INCHES NOMINAL OVERALL IN
MaterialCOTTON AND RUBBER CHLOROPRENE CLASS CR SECOND PLY
Style DesignatorSLEEVE SECTION
MaterialCOTTON AND RUBBER CHLOROPRENE CLASS CR FIRST PLY
End Inside Diameter3.000 INCHES NOMINAL BOTH ENDS IN
End Overall Length1.500 INCHES NOMINAL SECOND END IN
End Overall Length2.000 INCHES NOMINAL FIRST END IN
Cross-Sectional Shape StyleROUND
Hose Weight0.550 OUNCES PER LINEAR FOOT OZ
Wall Thickness0.109 INCHES MAXIMUM IN
Features ProvidedOZONE RESISTANT
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 10
6110-00-104-43415621 INTERCHANGEABLE
Protector,thermal-Overload,elect
Hdt Expeditionary Systems Inc
5905-00-141-1116 INTERCHANGEABLE
Resistor,fixed,composition
5910-00-332-0777SM-A-935135-1 INTERCHANGEABLE
Capacitor,variable,air Dielectri
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
5998-00-545-4983 INTERCHANGEABLE
Extender Card,electronic Test
5950-00-645-77615621 INTERCHANGEABLE
Transformer,audio Frequency
Precision Electronics, Inc
5975-00-661-1007 INTERCHANGEABLE
Box Connector,electrical
5895-00-784-3797712699-001 INTERCHANGEABLE
Core
Raytheon Company Dba Raytheon
5955-01-125-063256-2-1 INTERCHANGEABLE
Crystal Unit,quartz
Microsemi Corp. - High Performance Timing Dba Vectron International- Cancelled
4710-01-316-238356-21 INTERCHANGEABLE
Tube Assembly,metal
Chicago Faucet Co the
7025-01-523-12295621 INTERCHANGEABLE
Interface Unit,automatic Data Pr
Stingray56 Inc.
Cross-Reference Index
Part NumberManufacturer
8B601006 Crestview Aerospace Llc Div Crestview Aerospace (USA)
5621 PRIMARY Flexco, Inc (USA)
8B601006 Hiller Aircraft Corporation (USA)
Related Parts
6110-00-104-4341INTERCHANGEABLE
PROTECTOR,THERMAL-OVERLOAD,ELECT
5621
5905-00-141-1116INTERCHANGEABLE
RESISTOR,FIXED,COMPOSITION
5910-00-332-0777INTERCHANGEABLE
CAPACITOR,VARIABLE,AIR DIELECTRI
SM-A-935135-1
5998-00-545-4983INTERCHANGEABLE
EXTENDER CARD,ELECTRONIC TEST
5950-00-645-7761INTERCHANGEABLE
TRANSFORMER,AUDIO FREQUENCY
5621
5975-00-661-1007INTERCHANGEABLE
BOX CONNECTOR,ELECTRICAL
5895-00-784-3797INTERCHANGEABLE
CORE
712699-001
5955-01-125-0632INTERCHANGEABLE
CRYSTAL UNIT,QUARTZ
56-2-1
4710-01-316-2383INTERCHANGEABLE
TUBE ASSEMBLY,METAL
56-21
7025-01-523-1229INTERCHANGEABLE
INTERFACE UNIT,AUTOMATIC DATA PR
5621

Frequently Asked Questions

What is NSN 4720-00-541-0747?

NSN 4720-00-541-0747 is a Hose,air Duct, manufactured by Flexco, Inc, classified under FSC 4720 (No Item Name Available). Status: active.

What are the part numbers for NSN 4720-00-541-0747?

NSN 4720-00-541-0747 has 3 cross-referenced part numbers: 8B601006 (Crestview Aerospace Llc Div Crestview Aerospace), 5621 (Flexco, Inc), 8B601006 (Hiller Aircraft Corporation).

What NSN replaces 4720-00-541-0747?

There are 10 known substitutes for 4720-00-541-0747: 6110-00-104-4341, 5905-00-141-1116, 5910-00-332-0777 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 5621?

Key specifications for 5621: Inside Diameter: 3.000 INCHES NOMINAL FIRST END IN; Connection Type: SOFT BOTH ENDS; Connection Style: ROUND BOTH ENDS; Minimum Inside Bending Radius: 4.500 INCHES IN. 16 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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