MS16998-79
View detailed technical data, stock status, and sourcing information for: MS16998-79
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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.
2.210 inches minimum and 2.250 inches maximum fastener length, 1.210 inches minimum and 1.250 inches maximum thread length, flat chamfer head style, right-hand thread direction, 3a 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
- 3a
- Thread Direction
- right-hand
- Thread Length
- 1.210 inches minimum and 1.250 inches maximum
- Fastener Length
- 2.210 inches minimum and 2.250 inches maximum
- Head Style
- flat chamfer
- Head Diameter
- 0.550 inches minimum and 0.562 inches maximum
- Head Height
- 0.368 inches minimum and 0.375 inches maximum
- Internal Drive Style
- hexagon
- Nominal Thread Diameter
- 0.375 inches
- Width Across Flats
- 0.312 inches minimum and 0.316 inches maximum
- Thread Quantity Per Inch
- 24
- 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Below is a list of NSNs that have been officially superseded by this NSN: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 |
|---|---|---|
| 5305-00-638-8771 | No Name Available | 07/24/1968 |
| 5305-00-655-9578 | No Name Available | 07/24/1968 |
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 |
|---|---|
| 43S4378-490 | Socket Head Cap Screw |
| MS16998-79 | Socket Head Cap Screw |
| MS35456-52 | Socket Head Cap Screw |
| MS35458-51 | Socket Head Cap Screw |
| NAS1351-6 | Socket Head Cap Screw |
| NAS1351-6LB-36P | Socket Head Cap Screw |
| NAS1351-6LL-36P | Socket Head Cap Screw |
| XX004-4932 | Socket Head Cap Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-00-983-7434?
Does the NSN 5305-00-983-7434 have a Schedule B code assigned?
Does NSN 5305-00-983-7434 require demilitarization?
Does NSN 5305-00-983-7434 contain precious materials?
Does NSN 5305-00-983-7434 contain hazardous materials?
When the NSN 5305-00-983-7434 was assigned to the Federal Catalog?
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