Value Collection 99138 Hex Head Cap Screw 9/16-12 X 4.5 in Grade 8

Product Description

The VALUE COLLECTION 99138 is a Grade 8 steel hex head cap screw with a 9/16-12 UNC thread and a 4.5-inch length under head. Partially threaded, it is designed for high-strength fastening applications where clamp load and shear resistance are critical. The uncoated finish makes it suitable for use with thread-locking compounds or coatings applied in the field. Manufactured to ASME B18.2.1 and SAE J429 standards, this fastener is a dependable choice for mechanical assemblies requiring certified Grade 8 tensile performance. Machinists, millwrights, and maintenance technicians typically work with this fastener class.

This cap screw is used in heavy-duty mechanical, structural, and industrial assembly applications where standard Grade 5 hardware is insufficient. The partial thread configuration is well suited for through-bolt joints and applications where the unthreaded shank must bear shear loads. It is a common selection for equipment frames, machinery mounts, and fabricated steel assemblies across manufacturing, construction, and maintenance environments.

Key Features

• Grade 8 steel construction meets SAE J429 tensile and proof load requirements
• 9/16-12 UNC thread for compatibility with standard inch-series tapped holes and nuts
• Partially threaded shank provides shear load capacity in through-bolt applications
• Uncoated finish allows field application of thread-locking compounds or protective coatings
• Manufactured to ASME B18.2.1 dimensional standards for consistent head geometry and tolerances
• Sold in a package quantity of 25 with a minimum order quantity of 1

Compatibility

Designed as a standard inch-series hex head cap screw compatible with 9/16-12 UNC tapped holes and matching hex nuts in heavy-duty mechanical and structural assemblies.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or maintenance technician familiar with Grade 8 fastener torque requirements for the given joint application. Always consult the equipment manufacturer's torque specification and use a calibrated torque wrench. Ensure mating threads are clean and free of debris before assembly. Do not reuse fasteners that show signs of thread damage, stretching, or corrosion.