B1821BH088F400N

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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-00-213-8886

Item Name Code

18257

Assigment Date

04/25/1973 (53 years ago)

A nut, flat on top and bottom having 6 flat sides. For items which have internal tapered or straight (parallel) pipe threads, specific electrical conduit size designation, and which when installed, provide a method of tightening to lock the connection, see locknut, electrical conduit. See also locknut, tube fitting. For items having a thickness (or height) exceeding two times the width across the flats, use post, electrical-mechanical equipment. (when height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)

3.812 inches minimum and 4.000 inches maximum fastener length, 2a thread class, 2.188 inches minimum thread length, hexagon head style, right-hand thread direction

Product Characteristics

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

Thread Class: 2a
Thread Direction: right-hand
Thread Length: 2.188 inches minimum
Fastener Length: 3.812 inches minimum and 4.000 inches maximum
Head Style: hexagon
Head Height: 0.531 inches minimum and 0.563 inches maximum
Width Between Flats: 1.285 inches minimum and 1.312 inches maximum
Nominal Thread Diameter: 0.875 inches
Thread Quantity Per Inch: 14
Minimum Tensile Strength: 150000 pounds per square inch
Hardness Rating: 32.0 rockwell c minimum and 38.0 rockwell c maximum overall
Surface Finish: 63.0 microinches threads
Material: steel overall
Material Document And Classification: sae gr 8 assn std single material response overall
Surface Treatment: zinc and chromate overall
Surface Treatment Document And Classification: astm b633 ty 2 sc 3 assn std single treatment response overall
Thread Series Designator: unf
Nondefinitive Spec/Std Data: 2 type and 10p style and 8 grade

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
B1821BH088F400N	Hexagon Head Cap Screw
MS90727-217	Hexagon Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-00-213-8886?

The FSCG of the NSN 5305-00-213-8886 is 5305

Does the NSN 5305-00-213-8886 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-00-213-8886 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 5305-00-213-8886 contain precious materials?

Precious metal content is unknown

Does NSN 5305-00-213-8886 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 5305-00-213-8886 was assigned to the Federal Catalog?

It was assigned 53 years ago, on Wed, Apr 25, 1973