B1821BH038F125N
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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.
right-hand thread direction, hexagon head style, 1.250 inches nominal fastener length, 2a thread class, 1.000 inches minimum and 1.188 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
- 1.000 inches minimum and 1.188 inches maximum
- Fastener Length
- 1.250 inches nominal
- Head Style
- hexagon
- Head Height
- 0.226 inches minimum and 0.243 inches maximum
- Width Between Flats
- 0.551 inches minimum and 0.562 inches maximum
- End Item Identification
- mrap - cougar cat1 a2; mrap buffalo mk2a2; medium mine protected vehicle - mmpv; multiple launch rocket system
- Nominal Thread Diameter
- 0.375 inches
- Thread Quantity Per Inch
- 24
- 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 grade 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
Replaces National Stock Numbers
Below is a list of NSNs that have been officially superseded by this NSN:
| NSN | Name | Date |
|---|---|---|
| 5305-00-042-7977 | Hexagon Head Cap Screw | 07/01/2025 |
| 5305-00-206-1681 | Hexagon Head Cap Screw | 07/01/2025 |
| 5305-00-515-9353 | No Name Available | 11/01/1980 |
| 5305-01-057-4268 | No Name Available | 11/01/1979 |
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 |
|---|---|
| 01504-70 | Hexagon Head Cap Screw |
| 18257-182 | Hexagon Head Cap Screw |
| 18C620 | Hexagon Head Cap Screw |
| 427563 | Hexagon Head Cap Screw |
| 5305002693238 | Hexagon Head Cap Screw |
| 5305PL0817224 | Hexagon Head Cap Screw |
| 91248A626 | Hexagon Head Cap Screw |
| A200022988 | Hexagon Head Cap Screw |
| B1821BH038F125N | Hexagon Head Cap Screw |
| MS90727-62 | Hexagon Head Cap Screw |
| S210NA38FAK19354BNCG1 | Hexagon Head Cap Screw |
| XX002-0976 | Hexagon Head Cap Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-00-269-3238?
Does the NSN 5305-00-269-3238 have a Schedule B code assigned?
Does NSN 5305-00-269-3238 require demilitarization?
Does NSN 5305-00-269-3238 contain precious materials?
Does NSN 5305-00-269-3238 contain hazardous materials?
When the NSN 5305-00-269-3238 was assigned to the Federal Catalog?
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