4720-00-256-7821

Find complete technical information, availability, and procurement data for: 4720-00-256-7821
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Federal Supply Group

Pipe, Tubing, Hose, and Fittings

Federal Supply Classification

4720 Hose and Flexible Tubing

National Stock Number

4720-00-256-7821

Item Name Code

20311

Assigment Date

03/24/1971 (55 years ago)

round cross-sectional shape style, 3b 1st end thread class, right-hand 2nd end thread direction, 3b 2nd end thread class, right-hand 1st end thread direction

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Cross-Sectional Shape Style: round
Thread Class: 3b 1st end
Thread Class: 3b 2nd end
Thread Direction: right-hand 1st end
Thread Direction: right-hand 2nd end
Inside Diameter: 0.500 inches nominal
Temp Rating: -65.0 celsius and 450.0 celsius single response
Outside Diameter: 0.656 inches nominal
Minimum Inside Bending Radius: 6.500 inches
Connection Style: swivel nut, flareless 1st end
Connection Style: swivel nut, flareless 2nd end
End Connection Design: elbow 2nd end
End Connection Design: straight 1st end
Connection Type: threaded internal tube 1st end
Connection Type: threaded internal tube 2nd end
Features Provided: electrostatic discharge capability
Burst Test Pressure: 7000.0 pounds per square inch
Layer Composition And Location: outer layer braided corrosion resistant steel wire
Maximum Operating Pressure: 1500.0 pounds per square inch
Nominal Thread Size: 0.875 inches 1st end
Nominal Thread Size: 0.875 inches 2nd end
Seat Angle: 12.0 degrees 1st end
Seat Angle: 12.0 degrees 2nd end
Hydrostatic Test Pressure: 3000.0 pounds per square inch
Flow Angle: 45.0 degrees 2nd end
Outer Covering Environmental Protection: corrosion resistant
Vacuum In Torr: 50.8
Inside Surface Condition: smooth
Measuring Method And Length: 10.500 inches nominal working
Thread Series Designator: unf 1st end
Thread Series Designator: unf 2nd end

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number	Name
R9805DD10-0104	Nonmetallic Hose Assembly
T666125-10-0104	Nonmetallic Hose Assembly

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 4720-00-256-7821?

The FSCG of the NSN 4720-00-256-7821 is 4720

Does NSN 4720-00-256-7821 require demilitarization?

Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.

Does NSN 4720-00-256-7821 contain precious materials?

Precious metal content is unknown

Does NSN 4720-00-256-7821 contain hazardous materials?

Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

When the NSN 4720-00-256-7821 was assigned to the Federal Catalog?

It was assigned 55 years ago, on Wed, Mar 24, 1971