Value Collection 581405PR Hex Socket Cap Screw 1/4-28 Unf

Product Description

The VALUE COLLECTION 581405PR is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, tooling fixtures, and equipment manufacturing. This screw features a 1/4-28 UNF thread size with a 3-inch length under head and a 3/16-inch hex drive socket. Constructed from alloy steel with a black oxide finish coating, it delivers solid corrosion resistance and surface hardness in demanding environments. The partial threading provides a strong clamping grip on thicker materials. It is sized and specified to meet ASME/ANSI B18.3 and ASTM A574 standards, making it suitable for structural and load-bearing fastening tasks handled by machinists, millwrights, and maintenance technicians.

This socket cap screw is commonly used in precision machinery, hydraulic and pneumatic equipment, jigs, fixtures, and fabricated steel assemblies where fine-thread engagement and high tensile strength are required. The 1/4-28 UNF fine thread pattern provides superior holding power in applications with vibration or cyclic loading. Partial threading is appropriate for through-bolt applications where an unthreaded shank is needed for shear strength or alignment.

Key Features

• 1/4-28 UNF fine thread for strong engagement and vibration resistance
• 3-inch length under head accommodates thicker material stacking
• 3/16-inch hex socket drive for Allen wrench or hex key installation
• Alloy steel construction meets ASTM A574 high-strength requirements
• Black oxide finish provides moderate corrosion resistance and reduces light reflection
• Partially threaded shank supports shear-load and alignment applications
• Meets ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw suitable for use in any application requiring a 1/4-28 UNF partially threaded fastener with a 3/16-inch hex drive.

Installation Notes

Install using a 3/16-inch hex key or Allen driver; always torque to the specifications provided in the equipment service manual for the given alloy steel grade. Power down and de-energize any equipment before fastener replacement or adjustment. Ensure mating threads are clean and free of debris before installation to avoid galling or thread damage. Follow applicable ASME or equipment manufacturer guidelines for fastener reuse and torque sequencing.