B1821BH025C138N
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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.
0.750 inches minimum and 0.938 inches maximum thread length, hexagon head style, right-hand thread direction, 1.375 inches nominal fastener 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
- 0.750 inches minimum and 0.938 inches maximum
- Fastener Length
- 1.375 inches nominal
- Head Style
- hexagon
- Head Height
- 0.150 inches minimum and 0.163 inches maximum
- Width Between Flats
- 0.428 inches minimum and 0.438 inches maximum
- End Item Identification
- rg-33 auv mrap; multiple launch rocket system (mlrs); a4 bradley fighting vehicle; a3 bradley fighting vehicle
- Nominal Thread Diameter
- 0.250 inches
- Thread Quantity Per Inch
- 20
- Minimum Tensile Strength
- 150000 pounds per square inch
- Minimum Yield Strength
- 120000 pounds per square inch
- Material
- steel overall
- Material Document And Classification
- sae429 grade 8 assn std 1st material response or astma354 grade bd assn std 2nd 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 |
|---|---|
| 412-3250 | Hexagon Head Cap Screw |
| 5305002253841 | Hexagon Head Cap Screw |
| AES01C250A37AW9A91 | Hexagon Head Cap Screw |
| B1821BH025C138N | Hexagon Head Cap Screw |
| MS90728-11 | Hexagon Head Cap Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-00-225-3841?
Does the NSN 5305-00-225-3841 have a Schedule B code assigned?
Does NSN 5305-00-225-3841 require demilitarization?
Does NSN 5305-00-225-3841 contain precious materials?
Does NSN 5305-00-225-3841 contain hazardous materials?
When the NSN 5305-00-225-3841 was assigned to the Federal Catalog?
Professional Distribution
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- AS9120 Quality Standards
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