Value Collection 581630PR Hex Socket Cap Screw 9/16-18 Unf

Product Description

The VALUE COLLECTION 581630PR is a fully threaded hex socket cap screw engineered for high-strength fastening applications in mechanical assemblies, tooling, and structural fabrication. Sized at 9/16-18 UNF with 1 inch of length under the head, this fastener accepts a 7/16-inch hex drive for precise torque application. Constructed from alloy steel with a black oxide finish, it delivers solid corrosion resistance and maintains dimensional integrity under elevated clamping loads. It conforms to ASME/ANSI B18.3 and ASTM A574 standards. Machinists, millwrights, maintenance technicians, and fabricators routinely specify this screw type for both production and field repair work.

This screw is suited for use in close-tolerance bolt holes where a flush or recessed head is required. The 9/16-18 UNF fine thread pitch provides greater thread engagement per inch compared to coarse thread, making it a preferred choice in precision machinery, hydraulic components, and fixture plates where vibration resistance and fine adjustment are critical. The black oxide alloy steel construction handles moderate exposure environments while keeping surface hardness high.

Key Features

• 9/16-18 UNF fine thread for high thread engagement and vibration resistance
• 1 inch length under head, fully threaded for maximum engagement depth
• 7/16-inch hex socket drive for use with standard hex keys or socket drivers
• Alloy steel construction meets ASTM A574 high-strength requirements
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard 9/16-18 UNF hex socket cap screw per ASME/ANSI B18.3, suitable for tapped holes and threaded assemblies requiring a recessed hex drive fastener in that thread specification.

Installation Notes

Installation is typically performed by machinists, millwrights, or maintenance technicians using a 7/16-inch hex key or socket driver. Always verify that the mating tapped hole is clean, undamaged, and cut to 9/16-18 UNF specification before driving the fastener. Apply thread lubricant or thread-locking compound as required by the assembly specification. Do not exceed the torque rating specified in the applicable engineering drawing or fastener standard for ASTM A574 alloy steel cap screws.