B1821BH125F550N

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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5305 Screws

National Stock Number

5305-00-066-8174

Item Name Code

18257

Assigment Date

07/05/1967 (59 years ago)

An externally threaded fastener designed for insertion into holes in assembled parts, for mating with a preformed internal thread and for tightening or releasing by torquing the head. The threaded and unthreaded portions are both of the same nominal diameter of 0.190 inch (5 mm) or larger. Head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. The thread length being the controlled dimension, the grip length is not specified. A locking feature may be incorporated in the design of the head or threads. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. Excludes:bolt,machine; bolt,externally relieved body; bolt,internal wrenching; and screw,cap,socket head.

hexagon head style, right-hand thread direction, 5.500 inches nominal fastener length, 2.750 inches minimum thread length, 2a thread class

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: 2.750 inches minimum
Fastener Length: 5.500 inches nominal
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: 12
Minimum Tensile Strength: 150000 pounds per square inch
Hardness Rating: 32.0 rockwell c minimum and 38.0 rockwell c maximum overall
Material: steel overall
Material Document And Classification: sae j429 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
B1821BH125F550N	Hexagon Head Cap Screw
MS90727-282	Hexagon Head Cap Screw

FAQs

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

What is the FSCG of the NSN 5305-00-066-8174?

The FSCG of the NSN 5305-00-066-8174 is 5305

Does the NSN 5305-00-066-8174 have a Schedule B code assigned?

Yes, the Schedule B code is 7318152000

Does NSN 5305-00-066-8174 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 5305-00-066-8174 contain precious materials?

Precious metal content is unknown

Does NSN 5305-00-066-8174 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 5305-00-066-8174 was assigned to the Federal Catalog?

It was assigned 59 years ago, on Wed, Jul 5, 1967