Holo-krome 86154 Hex Socket Cap Screw 4-40 Unc Alloy Steel

Product Description

The HOLO-KROME 86154 is a hex socket cap screw designed for precision fastening applications requiring a compact, high-strength connection. Threaded 4-40 UNC and fully threaded along its 5/16-inch length under head, this screw accepts a 3/32-inch hex drive. It is manufactured from alloy steel and finished with a black oxide coating that provides mild corrosion resistance and a low-reflectance appearance. The black oxide finish also helps retain lubricants applied during assembly. This screw meets ASME B18.3 and ASTM A574 standards, making it suitable for applications where dimensional and mechanical consistency is required. Machinists, maintenance technicians, and assembly professionals routinely install this fastener type.

This screw is suited for light-duty mechanical assemblies, instrument panels, electronics enclosures, and small machine components where a low-profile socket head is preferred over a hex bolt or pan-head screw. The 4-40 UNC thread is a fine-pitch coarse series commonly found in precision equipment, fixtures, and small-bore tapped holes. Its compact drive size and fully threaded shank make it a practical choice for tight clearances and shallow-depth tapped holes in metal components.

Key Features

• 4-40 UNC thread for precision mechanical assemblies and small-bore applications
• Fully threaded along the 5/16-inch length under head for maximum thread engagement
• 3/32-inch hex socket drive for use with standard Allen or hex-key tools
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish provides mild corrosion resistance and lubricant retention
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in any application requiring a 4-40 UNC fully threaded fastener with a 3/32-inch hex drive.

Installation Notes

Installation requires a 3/32-inch hex key or Allen-drive bit. Ensure the tapped hole is clean and free of debris before driving the screw to avoid cross-threading. Do not exceed the rated torque range for 4-40 alloy steel fasteners as specified by the assembly designer or applicable engineering standard. Always verify thread engagement depth is sufficient before applying load.