Value Collection 581408PR Hex Socket Cap Screw 1/4-28 Unf

Product Description

The VALUE COLLECTION 581408PR is a hex socket cap screw designed for applications requiring a high-strength, compact-head fastener. It features a 1/4-28 UNF thread with a 3-1/2 inch length under head and is partially threaded, making it suited for clamping applications where thread engagement length matters. The screw is machined from alloy steel and finished with black oxide coating for corrosion resistance and a clean appearance. The 3/16 inch hex drive requires a standard hex key or Allen driver. Meets ASME/ANSI B18.3 and ASTM A574 standards. Installed by machinists, mechanical assemblers, and maintenance technicians across industrial and fabrication environments.

This fastener is used in mechanical assemblies, fixtures, tooling, and equipment where a flush or recessed drive head is required. The partial threading is appropriate for through-bolt clamping of two or more components, allowing the unthreaded shank to bear shear loads. Typical applications include machine frames, jigs, brackets, and maintenance repairs on industrial equipment. Sold individually but available in minimum order quantities of 100 units, making this item suitable for production runs and stocking inventory.

Key Features

• 1/4-28 UNF thread size for fine-pitch engagement and vibration resistance
• 3-1/2 inch length under head for deeper reach in thick material stacks
• Partially threaded shank for shear load bearing and clamping applications
• Alloy steel construction for high tensile strength per ASTM A574
• Black oxide finish reduces surface corrosion and minimizes light reflection
• 3/16 inch hex drive compatible with standard Allen keys and socket drivers

Compatibility

Designed as an OEM-style replacement or stock fastener for mechanical assemblies requiring a 1/4-28 UNF hex socket cap screw with a 3-1/2 inch length under head and partial threading.

Installation Notes

Installation is performed by machinists or maintenance technicians using a 3/16 inch hex key or T-handle Allen driver. Ensure the mating tapped hole or nut is clean and free of debris before threading. De-energize and lockout any equipment before fastener replacement on live machinery. Do not exceed the torque ratings specified by the equipment manufacturer for 1/4-28 alloy steel fasteners.