Value Collection 99116 Hex Head Cap Screw 1/2-13 X 4 in Grade 8

Product Description

The VALUE COLLECTION 99116 is a Grade 8 steel hex head cap screw with a 1/2-13 UNC thread and a 4-inch length under head. Partially threaded and left uncoated (bright finish), this fastener is built for high-strength bolted assemblies where clamping load and shear resistance matter. Grade 8 steel delivers significantly higher tensile and proof strength than Grade 5 or Grade 2 fasteners, making it a standard choice for structural, mechanical, and heavy-equipment applications. It conforms to ASME B18.2.1 dimensional standards, ensuring consistent head geometry and thread form across the lot.

This screw is used in industrial, commercial, and agricultural equipment assembly, structural steel connections, and general mechanical fabrication requiring a high-strength inch-series fastener. The 1/2-13 UNC thread is one of the most common coarse-thread sizes in North American trade work, fitting standard nuts, inserts, and tapped holes of the same designation. The partial threading allows for a smooth shank section that improves shear load distribution in bolted joint applications. Maintenance mechanics, millwrights, and fabricators regularly specify this fastener configuration for critical bolted connections.

Key Features

• Grade 8 steel construction for high tensile and proof-load strength
• 1/2-13 UNC coarse thread, partially threaded with smooth shank section
• 4-inch length under head to accommodate thick structural members
• Bright/uncoated finish — suitable for indoor or controlled-environment use
• Conforms to ASME B18.2.1 for consistent head and thread dimensions
• Sold in packages of 25 per lot

Compatibility

Designed for use with standard 1/2-13 UNC hex nuts, lock nuts, and tapped holes conforming to UNC inch-series thread standards.

Installation Notes

Installation is performed by mechanics, millwrights, or maintenance technicians using a standard hex wrench or impact driver with the appropriate 3/4-inch hex socket. Always confirm the mating nut or tapped hole matches the 1/2-13 UNC thread specification before assembly. Grade 8 fasteners should be torqued using a calibrated torque wrench per the applicable engineering specification or equipment service manual for the joint being assembled. Bright-finish fasteners are not corrosion-resistant — evaluate coating requirements before use in wet or outdoor environments.