NAS1581F4T5
View detailed technical data, stock status, and sourcing information for: NAS1581F4T5
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A screw, machine or screw, cap, socket head whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 in.) (0.025 mm) or less of a specific diameter for items (1.000 in.) (25 mm) or less in diameter. Items over (1.000 in.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 in.) (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001 in.) (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 designed to be held or driven with an inserted driver. It is not designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads.
0.403 inches nominal thread length, 3a thread class, 0.700 inches minimum and 0.730 inches maximum fastener length, right-hand thread direction, flat countersunk head style
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
- 0.403 inches nominal
- Fastener Length
- 0.700 inches minimum and 0.730 inches maximum
- Head Style
- flat countersunk
- Head Diameter
- 0.350 inches minimum and 0.398 inches maximum
- Grip Diameter
- 0.2485 inches minimum and 0.2495 inches maximum
- Internal Drive Style
- offset cruciform (torque set)
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.302 inches minimum and 0.322 inches maximum
- Thread Quantity Per Inch
- 28
- Minimum Tensile Strength
- 160000 pounds per square inch
- Hardness Rating
- 36.0 rockwell c minimum and 40.0 rockwell c maximum overall
- Countersink Angle
- 100.0 degrees nominal
- Surface Finish
- 32.0 microinches grip
- Surface Finish
- 32.0 microinches threads
- Material
- steel comp e4340 or steel comp 4140 or steel comp 8740 or steel comp 6150 or steel comp 8735 overall
- Surface Treatment
- cadmium and chromate overall
- Surface Treatment Document And Classification
- qq-p-416 ty2 cl2 fed spec single treatment response overall
- Thread Series Designator
- unjf
- Specification/Standard Data
- 80205-nas1581 professional/industrial association standard
Replaces National Stock Numbers
Below is a list of NSNs that have been officially superseded by this NSN:
| NSN | Name | Date |
|---|---|---|
| 5305-01-417-6404 | No Name Available | 09/01/2007 |
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 |
|---|---|
| 10114927 | Close Tolerance Screw |
| 5305PL0854047 | Close Tolerance Screw |
| NAS1581A4T5 | Close Tolerance Screw |
| NAS1581F4T5 | Close Tolerance Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-01-057-9331?
Does the NSN 5305-01-057-9331 have a Schedule B code assigned?
Does NSN 5305-01-057-9331 require demilitarization?
Does NSN 5305-01-057-9331 contain precious materials?
Does NSN 5305-01-057-9331 contain hazardous materials?
When the NSN 5305-01-057-9331 was assigned to the Federal Catalog?
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