3M991-4-13
View detailed technical data, stock status, and sourcing information for: 3M991-4-13
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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.
1.210 inches minimum and 1.250 inches maximum thread length, 3a thread class, flat chamfer head style, 1.210 inches minimum and 1.250 inches maximum fastener length, 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
- 3a
- Thread Direction
- right-hand
- Thread Length
- 1.210 inches minimum and 1.250 inches maximum
- Fastener Length
- 1.210 inches minimum and 1.250 inches maximum
- Head Style
- flat chamfer
- Head Diameter
- 0.365 inches minimum and 0.375 inches maximum
- Head Height
- 0.244 inches minimum and 0.250 inches maximum
- Internal Drive Style
- hexagon
- Nominal Thread Diameter
- 0.250 inches
- Width Across Flats
- 0.187 inches minimum and 0.190 inches maximum
- Thread Quantity Per Inch
- 28
- Minimum Tensile Strength
- 160000 pounds per square inch
- Hardness Rating
- 36.0 rockwell c minimum and 45.0 rockwell c maximum overall
- Minimum Yield Strength
- 130000 pounds per square inch
- Material
- steel overall
- Surface Treatment
- cadmium and chromate overall
- Surface Treatment Document And Classification
- qq-p-416 ty 2 cl 3 fed spec 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Below is a list of NSNs that have been officially superseded by this NSN: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 |
|---|---|---|
| 5305-00-090-1609 | No Name Available | 09/01/1982 |
| 5305-00-273-4908 | No Name Available | 12/01/1982 |
| 5305-00-731-2939 | No Name Available | 04/11/1967 |
| 5305-00-839-8777 | No Name Available | 05/13/1967 |
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 |
|---|---|
| 190057 | Socket Head Cap Screw |
| 3M991-4-13 | Socket Head Cap Screw |
| 4912853-04 | Socket Head Cap Screw |
| 5305009836663 | Socket Head Cap Screw |
| 852642-00 | Socket Head Cap Screw |
| MS-16998-46 | Socket Head Cap Screw |
| MS16998-46 | Socket Head Cap Screw |
| MS35456-26 | Socket Head Cap Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-00-983-6663?
Does the NSN 5305-00-983-6663 have a Schedule B code assigned?
Does NSN 5305-00-983-6663 require demilitarization?
Does NSN 5305-00-983-6663 contain precious materials?
Does NSN 5305-00-983-6663 contain hazardous materials?
When the NSN 5305-00-983-6663 was assigned to the Federal Catalog?
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Pricing
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