Value Collection D39410 Hex Head Cap Screw 1/2-20 X 2.5 in

Product Description

The VALUE COLLECTION D39410 is a Grade 8 steel hex head cap screw with a 1/2-20 UNF thread form and a 2.5-inch length under head. It features a zinc yellow dichromate finish that provides corrosion resistance in demanding environments. The screw is partially threaded and conforms to ASME B18.2.1 dimensional standards. This fastener is suited for high-strength bolted joints where a fine-thread pitch is required. Licensed tradespeople and maintenance technicians in HVAC, plumbing, electrical, and mechanical contracting regularly use Grade 8 fasteners for structural and equipment-mounting applications that require elevated tensile and proof-load ratings compared to lower-grade hardware.

This cap screw is appropriate for use in heavy-duty mechanical assemblies, equipment frames, and structural connections where fine-thread engagement and high clamp load are needed. The 1/2-20 UNF thread pitch provides greater thread engagement per inch than coarse-thread equivalents, making it well suited for applications involving vibration or thin-material fastening. It is commonly used in industrial maintenance, mechanical equipment installation, and trade service work across residential and commercial settings.

Key Features

• Grade 8 steel construction delivers high tensile strength and proof load for demanding bolted-joint applications
• 1/2-20 UNF thread form provides finer pitch for improved vibration resistance and clamp load
• Zinc yellow dichromate finish adds corrosion resistance over bare steel
• Partially threaded shank allows for shear load transfer in close-tolerance holes
• Conforms to ASME B18.2.1 for consistent dimensional tolerances
• Length under head measured at 2.5 inches per standard inch measurement convention

Compatibility

Designed as a standard 1/2-20 UNF Grade 8 hex head cap screw conforming to ASME B18.2.1, suitable for use in any application requiring an inch-series fine-thread fastener of this size and grade.

Installation Notes

Installation should be performed by a qualified technician familiar with fastener torque requirements for Grade 8 hardware at the 1/2-inch diameter. Always de-energize and isolate any equipment before replacing structural fasteners. Use a calibrated torque wrench and apply the appropriate fastener-grade torque specification from the equipment manufacturer or a recognized fastener standard. Inspect mating threads for damage or corrosion before installation and replace any damaged hardware.