Value Collection 581443PR Hex Socket Cap Screw 5/16-18

Product Description

The VALUE COLLECTION 581443PR is a partially threaded hex socket cap screw designed for high-strength fastening applications requiring a recessed drive interface. Sized at 5/16-18 UNC with a 6.5-inch length under the head, this fastener is driven with a 1/4-inch hex key. Constructed from alloy steel and finished with a black oxide coating, it resists corrosion and reduces light reflection in service environments. The ASME/ANSI B18.3 and ASTM A574 standards govern its dimensional and mechanical requirements, making it a recognized choice for structural and mechanical assemblies where verified fastener performance is required.

This cap screw is suited for machine assembly, jig and fixture fabrication, tooling plates, and general mechanical installations where a flush or countersunk head profile and positive hex drive engagement are needed. The partial threading allows for a strong clamping zone through unthreaded shank engagement in close-tolerance bored holes. Machinists, millwrights, maintenance technicians, and fabricators commonly install this fastener in both production and field-repair settings.

Key Features

• 5/16-18 UNC thread size for broad compatibility with standard tapped holes
• 6.5-inch length under head accommodates deep grip or stacked-material applications
• Partial threading provides full shank engagement in close-tolerance through-holes
• 1/4-inch hex socket drive for use with standard hex keys and socket bits
• Alloy steel construction meets ASTM A574 mechanical strength requirements
• Black oxide finish provides mild corrosion resistance and low-glare appearance

Compatibility

Designed as an OEM-style replacement or standard-fitment fastener for any application requiring a 5/16-18 UNC hex socket cap screw conforming to ASME/ANSI B18.3 dimensional standards.

Installation Notes

Installation is performed with a 1/4-inch hex key or compatible bit driver. Ensure the tapped hole thread is clean and free of debris before seating the fastener. Apply appropriate thread lubricant or thread-locking compound as required by the assembly specification. Do not exceed the torque value specified by the equipment manufacturer or applicable engineering documentation for this thread size and material grade.