HT4056-4-8A
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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.
0.911 inches minimum and 0.941 inches maximum fastener length, 0.401 inches minimum and 0.451 inches maximum thread length, right-hand thread direction, 3a thread class, 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
- 0.401 inches minimum and 0.451 inches maximum
- Fastener Length
- 0.911 inches minimum and 0.941 inches maximum
- Head Style
- flat countersunk
- Head Diameter
- 0.456 inches minimum and 0.508 inches maximum
- Grip Diameter
- 0.2485 inches minimum and 0.2495 inches maximum
- Internal Drive Style
- high-torque
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.490 inches minimum and 0.510 inches maximum
- Thread Quantity Per Inch
- 28
- Countersink Angle
- 99.0 degrees minimum and 101.0 degrees maximum
- Surface Finish
- 32.0 microinches grip
- Surface Finish
- 32.0 microinches threads
- Material
- titanium alloy overall
- Material Document And Classification
- nas621 assn std single material response overall
- Surface Treatment
- aluminum overall
- Surface Treatment Document And Classification
- ps13143,ty 2,cl 3 fscm 76301 mfr ref single treatment response overall
- Thread Series Designator
- unjf
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 |
|---|---|
| 10115259 | Close Tolerance Screw |
| HT4056-4-8A | Close Tolerance Screw |
| ST3M732-4L8 | Close Tolerance Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-01-130-9017?
Does the NSN 5305-01-130-9017 have a Schedule B code assigned?
Does NSN 5305-01-130-9017 require demilitarization?
Does NSN 5305-01-130-9017 contain precious materials?
Does NSN 5305-01-130-9017 contain hazardous materials?
When the NSN 5305-01-130-9017 was assigned to the Federal Catalog?
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