Value Collection HCI50870550G Hex Head Cap Screw 7/8-9

Product Description

The VALUE COLLECTION HCI50870550G is a partially threaded hex head cap screw designed for heavy-duty bolted connections in structural and mechanical applications. Manufactured from Grade 5 steel with a hot-dipped galvanized finish, this fastener delivers solid corrosion resistance and shear strength. The 7/8-9 UNC thread profile and 5-1/2 inch length under head make it suitable for thick-section assemblies where a full-thread grip would be inadequate. The hot-dipped galvanized coating provides a thicker zinc layer than electroplated alternatives, offering durable protection in outdoor and exposed environments. Licensed tradespeople and maintenance technicians working in construction, industrial maintenance, and mechanical contracting will encounter this fastener regularly.

This screw is used in applications requiring a coarse-thread UNC fastener in the 7/8-inch diameter class. Partial threading is appropriate when a bolt must pass through a clearance hole before engaging a tapped hole or nut, keeping the shank smooth through the grip length. Common install scenarios include structural steel connections, equipment mounting, heavy machinery assembly, and outdoor infrastructure work where galvanized corrosion protection is specified. The inch measurement system and UNC thread standard are standard in North American trade work.

Key Features

• Grade 5 steel construction provides higher tensile and proof-load strength compared to Grade 2 fasteners
• Hot-dipped galvanized finish delivers thick zinc coating for corrosion resistance in exterior and wet environments
• Partially threaded shank maintains a smooth grip length for clearance-hole applications
• 7/8-9 UNC thread is a standard coarse-thread specification widely used in North American mechanical and structural work
• 5-1/2 inch length under head accommodates thick-section clamping stacks

Compatibility

Designed for use with standard 7/8-9 UNC hex nuts, flat washers, and lock washers in inch-measurement fastener applications. Suitable for structural and mechanical assemblies specifying Grade 5 or equivalent fastener strength and a hot-dipped galvanized corrosion-protection coating.

Installation Notes

Installation should be performed by qualified tradespeople following applicable mechanical or structural codes. Always ensure mating threads are clean and undamaged before assembly. Use a calibrated torque wrench and follow the torque specifications outlined in the relevant project specification or fastener standard, as no specific torque value is provided with this part. Inspect the galvanized coating for damage before installation; damaged coatings may reduce corrosion protection at the affected area.