Holo-krome 86580 Hex Socket Cap Screw 1/4-20 Unc

Product Description

The HOLO-KROME 86580 is a hex socket cap screw designed for high-strength fastening applications in industrial and mechanical assemblies. It features a 1/4-20 UNC thread size with a 3-3/4 inch length under the head and is partially threaded. The 3/16 inch hex drive accepts a standard hex key or Allen wrench. Manufactured from alloy steel with a black oxide finish, this fastener resists corrosion and withstands moderate surface wear. It meets ASME B18.3 and ASTM A574 standards, making it suitable for demanding structural and mechanical fastening work performed by machinists, millwrights, and maintenance technicians.

This screw is used in precision mechanical assemblies, machine frames, fixtures, and equipment maintenance applications where a recessed-drive fastener is required. The partially threaded shank provides a bearing surface for shear loading, which is common in shaft collars, gearbox housings, and structural machine components. Sold individually with a minimum order quantity of 10 units per order.

Key Features

• 1/4-20 UNC thread size for compatibility with standard inch-series tapped holes
• 3-3/4 inch length under head with partial threading for shear-load applications
• 3/16 inch hex socket drive for use with standard hex keys
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• Black oxide finish provides moderate corrosion resistance and reduces light reflection
• Conforms to ASME B18.3 socket cap screw dimensional standard

Compatibility

Designed as a standard inch-series hex socket cap screw for use in any 1/4-20 UNC tapped hole requiring a partially threaded alloy steel fastener with a 3/16 inch hex drive.

Installation Notes

Installation is typically performed by machinists, millwrights, or maintenance technicians using a 3/16 inch hex key or hex bit driver. Always ensure the tapped hole is clean and free of debris before driving the fastener. Do not exceed the fastener torque rating for the assembly material. Follow applicable ASME or equipment manufacturer guidelines for preload and fastener reuse.