138378
View detailed technical data, stock status, and sourcing information for: 138378
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An externally threaded fastener whose threaded portion is of one nominal diameter. The head has an internal socket or multiple spline for use with an inserted driver. A locking feature may be incorporated in the design of the head or threads. Excludes:items with bevel (conical) heads. See bolt, internal wrenching. Excludes:screw, shoulder; and screw, machine.
flat chamfer head style, 2.719 inches minimum and 2.781 inches maximum fastener length, right-hand thread direction, 3a thread class, 1.437 inches minimum 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
- 3a
- Thread Direction
- right-hand
- Thread Length
- 1.437 inches minimum
- Fastener Length
- 2.719 inches minimum and 2.781 inches maximum
- Head Style
- flat chamfer
- Head Diameter
- 0.863 inches minimum and 0.875 inches maximum
- Head Height
- 0.616 inches minimum and 0.625 inches maximum
- Internal Drive Style
- hexagon
- Nominal Thread Diameter
- 0.625 inches
- Width Across Flats
- 0.500 inches minimum and 0.503 inches maximum
- Thread Quantity Per Inch
- 18
- Hardness Rating
- 36.0 rockwell c minimum and 43.0 rockwell c maximum overall
- Material
- steel 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Below is a list of NSNs that have been officially superseded by this NSN: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 |
|---|---|---|
| 5305-00-274-2569 | No Name Available | 01/01/1963 |
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 |
|---|---|
| 138378 | Socket Head Cap Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-00-013-8378?
Does the NSN 5305-00-013-8378 have a Schedule B code assigned?
Does NSN 5305-00-013-8378 require demilitarization?
Does NSN 5305-00-013-8378 contain precious materials?
Does NSN 5305-00-013-8378 contain hazardous materials?
When the NSN 5305-00-013-8378 was assigned to the Federal Catalog?
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Pricing
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