B1821BH063F275N
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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.
2.750 inches nominal fastener length, hexagon head style, 1.500 inches minimum and 1.688 inches maximum 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
- 1.500 inches minimum and 1.688 inches maximum
- Fastener Length
- 2.750 inches nominal
- Head Style
- hexagon
- Head Height
- 0.378 inches minimum and 0.403 inches maximum
- Width Between Flats
- 0.922 inches minimum and 0.938 inches maximum
- End Item Identification
- mrap rg-33; mrap buffalo mk2a2
- Nominal Thread Diameter
- 0.625 inches
- Thread Quantity Per Inch
- 18
- Minimum Tensile Strength
- 150000 pounds per square inch
- Hardness Rating
- 32.0 rockwell c minimum and 38.0 rockwell c maximum overall
- Minimum Yield Strength
- 120000 pounds per square inch
- 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
Replaces National Stock Numbers
Below is a list of NSNs that have been officially superseded by this NSN:
| NSN | Name | Date |
|---|---|---|
| 5305-00-022-3814 | No Name Available | 02/01/1980 |
| 5305-00-042-8738 | No Name Available | 05/20/2022 |
| 5305-00-057-1083 | No Name Available | 06/01/1980 |
| 5305-00-531-0463 | Hexagon Head Cap Screw | 07/01/2025 |
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 |
|---|---|
| 5305007262554 | Hexagon Head Cap Screw |
| AS60-10-22 | Hexagon Head Cap Screw |
| B1821BH063F275N | Hexagon Head Cap Screw |
| MS90727-167 | Hexagon Head Cap Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-00-726-2554?
Does the NSN 5305-00-726-2554 have a Schedule B code assigned?
Does NSN 5305-00-726-2554 require demilitarization?
Does NSN 5305-00-726-2554 contain precious materials?
Does NSN 5305-00-726-2554 contain hazardous materials?
When the NSN 5305-00-726-2554 was assigned to the Federal Catalog?
Professional Distribution
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- ITAR Registered
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- AS9120 Quality Standards
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