B1821BH113F225N

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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-00-406-0540

Item Name Code

18257

Assigment Date

04/16/1971 (55 years ago)

An item designed to fit over a packing gland by mating with a surface of a second part which together will retain into a narrow groove or confined space the packing, preformed or o-ring, or an item designed to fit over a rod or shaft, to mate with a stuffing box to confine packing material. It may function as a static or dynamic seal retainer with the packing located on, around, or in the centerline direction of the rod or shaft axis. It may have holes or joints for mounting, be threaded or unthreaded. See also packing nut and packing nut, stuffing tube.

2.062 inches minimum and 2.250 inches maximum fastener length, hexagon head style, 1.854 inches minimum thread length, 2a thread class, 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: 1.854 inches minimum
Fastener Length: 2.062 inches minimum and 2.250 inches maximum
Head Style: hexagon
Head Height: 0.658 inches minimum and 0.718 inches maximum
Width Between Flats: 1.631 inches minimum and 1.687 inches maximum
Nominal Thread Diameter: 1.125 inches
Thread Quantity Per Inch: 12
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: stm 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 gr8 style

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
B1821BH113F225N	Hexagon Head Cap Screw
MS90727-251	Hexagon Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-00-406-0540?

The FSCG of the NSN 5305-00-406-0540 is 5305

Does the NSN 5305-00-406-0540 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-00-406-0540 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 5305-00-406-0540 contain precious materials?

Precious metal content is unknown

Does NSN 5305-00-406-0540 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 5305-00-406-0540 was assigned to the Federal Catalog?

It was assigned 55 years ago, on Fri, Apr 16, 1971