NAS56A37
View detailed technical data, stock status, and sourcing information for: NAS56A37
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An externally threaded fastener whose unthreaded portion is of a specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001) of an inch (0.025 mm) or less of a specific diameter for items one inch (25 mm) or less in diameter. Items over one inch (25 mm) in diameter shall have a tolerance of fifteen ten-thousandths (0.0015) of an inch (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001) of an inch (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the screw thread standards, fed std h28 and/or other nationally recognized standards. The head is not designed to be held or driven with an inserted driver, nor is it designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. For items having close tolerance, and fabricated from material having 160,000 pounds per square inch (1100 megapascals) minimum tensile strength, see bolt, shear. For items fabricated from material having less than 160,000 pounds per square inch (1100 megapascals) minimum tensile strength and not having a close tolerance, see bolt, machine.
3.937 inches minimum and 3.984 inches maximum fastener length, 0.609 inches minimum and 0.688 inches maximum thread length, 3a thread class, hexagon head style, 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
- 0.609 inches minimum and 0.688 inches maximum
- Fastener Length
- 3.937 inches minimum and 3.984 inches maximum
- Head Style
- hexagon
- Head Height
- 0.203 inches minimum and 0.235 inches maximum
- Width Between Flats
- 0.553 inches minimum and 0.565 inches maximum
- Grip Diameter
- 0.3737 inches minimum and 0.3742 inches maximum
- Nominal Thread Diameter
- 0.375 inches
- Grip Length
- 3.296 inches minimum and 3.328 inches maximum
- Thread Quantity Per Inch
- 24
- Minimum Tensile Strength
- 125000 pounds per square inch
- Hardness Rating
- 26.0 rockwell c minimum and 32.0 rockwell c maximum overall
- Material
- steel comp 4037 or steel comp 4130 or steel comp 8630 or steel comp 8735 or steel comp 8740 or steel comp 4140 overall
- Material Document And Classification
- mil-b-6812 mil spec all material responses overall
- Surface Treatment
- cadmium and chromate overall
- Surface Treatment Document And Classification
- qq-p-416 ty 2 cl 3 fed spec all treatment responses 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 |
|---|---|---|
| 5306-00-282-2800 | No Name Available | 01/01/1961 |
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:
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5306-00-584-7499?
Does the NSN 5306-00-584-7499 have a Schedule B code assigned?
Does NSN 5306-00-584-7499 require demilitarization?
Does NSN 5306-00-584-7499 contain precious materials?
Does NSN 5306-00-584-7499 contain hazardous materials?
When the NSN 5306-00-584-7499 was assigned to the Federal Catalog?
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