HT239PB4-3
View detailed technical data, stock status, and sourcing information for: HT239PB4-3
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An externally threaded fastener designed for insertion through holes in assembled parts and normally intended to be tightened or released by torquing a nut. The threaded and unthreaded portions are both of one nominal diameter of 0.190 inch (5 mm) or larger. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. Head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. For items having a grip length portion machined to a tolerance of 0.0015 inch (0.038 mm) or less, bolt, shear. See also screw, cap, hexagon head and screw, machine.
3a thread class, right-hand thread direction, flat countersunk head style, 0.290 inches minimum and 0.356 inches maximum thread length, 0.488 inches minimum and 0.534 inches maximum fastener length
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
- 0.290 inches minimum and 0.356 inches maximum
- Fastener Length
- 0.488 inches minimum and 0.534 inches maximum
- Head Style
- flat countersunk
- Head Diameter
- 0.390 inches minimum and 0.395 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
- 0.178 inches minimum and 0.198 inches maximum
- Thread Quantity Per Inch
- 28
- Minimum Tensile Strength
- 160000 pounds per square inch
- Countersink Angle
- 100.0 degrees nominal
- Surface Finish
- 63.0 microinches grip
- Surface Finish
- 63.0 microinches threads
- Material
- steel comp 4130 overall
- Material Document And Classification
- mil-s-6758 mil spec single material response 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
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 |
|---|---|
| GB510L4-3 | Close Tolerance Screw |
| HT239PB4-3 | Close Tolerance Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-00-165-7923?
Does the NSN 5305-00-165-7923 have a Schedule B code assigned?
Does NSN 5305-00-165-7923 require demilitarization?
Does NSN 5305-00-165-7923 contain precious materials?
Does NSN 5305-00-165-7923 contain hazardous materials?
When the NSN 5305-00-165-7923 was assigned to the Federal Catalog?
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