B1821BH125C250N

View detailed technical data, stock status, and sourcing information for: B1821BH125C250N
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-01-342-8502

Item Name Code

18257

Assigment Date

07/31/1991 (34 years ago)

A headless, generally cylindrically-shaped item having a straight, smooth, solid body, with or without a drilled hole(s). It has an outside diameter equal to or less than its length. Its length must not exceed twelve inches (304 mm); for items whose length exceeds twelve inches (304 mm); see rod,straight,headless. It is used for aligning or transfer of torque and/or thrust, by fitting into corresponding holes of another item. See also pin,straight,threaded.

hexagon head style, 2.312 inches minimum and 2.500 inches maximum fastener length, right-hand thread direction, 2a thread class, 1.955 inches minimum and 2.500 inches maximum thread length

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: 1.955 inches minimum and 2.500 inches maximum
Fastener Length: 2.312 inches minimum and 2.500 inches maximum
Head Style: hexagon
Head Height: 0.749 inches minimum and 0.813 inches maximum
Width Between Flats: 1.812 inches minimum and 1.875 inches maximum
Nominal Thread Diameter: 1.250 inches
Thread Quantity Per Inch: 7
Minimum Tensile Strength: 150000 pounds per square inch
Material: steel overall
Material Document And Classification: sae gr 8 j429 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: unc

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
B1821BH125C250N	Hexagon Head Cap Screw
MS90728-271	Hexagon Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-01-342-8502?

The FSCG of the NSN 5305-01-342-8502 is 5305

Does the NSN 5305-01-342-8502 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-01-342-8502 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 5305-01-342-8502 contain precious materials?

Item does not contain precious metal.

Does NSN 5305-01-342-8502 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 5305-01-342-8502 was assigned to the Federal Catalog?

It was assigned 34 years ago, on Wed, Jul 31, 1991