BL21771

View detailed technical data, stock status, and sourcing information for: BL21771
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Federal Supply Group

Electrical and Electronic Equipment Components

Federal Supply Classification

National Stock Number

5985-00-276-3336

Item Name Code

00305

Assigment Date

01/01/1963 (63 years ago)

internal, rectangular external, rectangular cross-sectional shape style, 2b second flange all connection facilities thread class, right-hand second flange all connection facilities thread direction, interlocked single tubing segment tubing wall construction style, 90.0 single bend h-plane bend angle in deg

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: internal, rectangular external, rectangular
Thread Class: 2b second flange all connection facilities
Thread Direction: right-hand second flange all connection facilities
Bend Angle In Deg: 90.0 single bend h-plane
Tubing Wall Construction Style: interlocked single tubing segment
Flange Quantity: 2
Flange Inside Width: 1.122 inches nominal first flange
Flange Inside Width: 1.253 inches nominal second flange
Flange Inside Height: 0.497 inches nominal first flange
Flange Inside Height: 0.628 inches nominal second flange
Flange Outside Width: 1.875 inches nominal first flange
Flange Outside Width: 1.875 inches nominal second flange
Flange Outside Height: 1.875 inches nominal first flange
Flange Outside Height: 1.875 inches nominal second flange
Flange Depth: 0.4375 inches nominal second flange
Flange Depth: 0.625 inches nominal first flange
Flange Connecting Hole Diameter: 0.169 inches nominal first flange all connection facilities
Thread Quantity Per Inch: 32 second flange all connection facilities
Waveguide Outside Width: 1.122 inches nominal
Nominal Thread Size: 0.164 inches second flange all connection facilities
Waveguide Inside Width: 0.497 inches nominal
Waveguide Inside Height: 0.625 inches nominal
Waveguide Outside Height: 1.250 inches nominal
Waveguide Longer Offset Distance: 4.062 inches nominal
Flange Connecting Facility And Quantity: 8 threaded hole second flange all connection facilities
Flange Connecting Facility And Quantity: 8 unthreaded hole first flange all connection facilities
Flange Style: choke type first flange
Flange Style: cover type second flange
Waveguide Offset Distance: 4.062 inches nominal
Flexibility: rigid single tubing segment
Material: copper alloy single tubing segment
Style Designator: bend type
Thread Series Designator: unc second flange all connection facilities
Specification/Standard Data: 81349-mil-w-3970/13 government specification

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
5985-00-243-0588	No Name Available	06/21/1972
5985-00-265-8989	No Name Available	06/21/1972
5985-00-319-4497	No Name Available	01/01/2009

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
BL21771	Waveguide Assembly
BL21772	Waveguide Assembly
M3970/13-004	Waveguide Assembly
MIL-DTL-3970/13	Waveguide Assembly
MIL-W-3970/13	Waveguide Assembly
MS35156-4	Waveguide Assembly
RE49D655TYPEUG715U	Waveguide Assembly
UG-143/U	Waveguide Assembly
UG-715/U	Waveguide Assembly

FAQs

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

What is the FSCG of the NSN 5985-00-276-3336?

The FSCG of the NSN 5985-00-276-3336 is 5985

Does the NSN 5985-00-276-3336 have a Schedule B code assigned?

Yes, the Schedule B code is 8529109000

Does NSN 5985-00-276-3336 require demilitarization?

Usml or ccl military items - demil required. Destroy item and components to prevent restoration or repair to a usable condition. (note 5).

Does NSN 5985-00-276-3336 contain precious materials?

Precious metal content is unknown

Does NSN 5985-00-276-3336 contain hazardous materials?

Indicates there is no information in the hmirs. The nsn is in a fsc in table ii of fed std 313 and a msds may be required by the user. The requirement for a msds is dependent on a hazard determination of the supplier or the intended end use of item.

When the NSN 5985-00-276-3336 was assigned to the Federal Catalog?

It was assigned 63 years ago, on Tue, Jan 1, 1963