Value Collection D39158 Hex Head Cap Screw 5/8-11 X 4.5 in

Product Description

The Value Collection D39158 is a Grade 8 steel hex head cap screw with a 5/8-11 UNC thread and a length under head of 4-1/2 inches. It features partial threading and a zinc yellow dichromate finish, which provides corrosion resistance in demanding service environments. Manufactured to ASME B18.2.1 dimensional standards, this fastener is suited for high-strength bolted connections in mechanical, industrial, and structural assemblies. Grade 8 designation indicates a minimum tensile strength appropriate for heavy-duty clamping loads, making it a common choice for equipment fabrication, machinery mounting, and structural steel work.

This cap screw is used across a wide range of trade and industrial applications where high-clamping-force fasteners are required. Typical install scenarios include mechanical equipment mounting, HVAC structural framing, pump and motor bases, and general fabrication work. The partial threading allows the unthreaded shank to act as a locating feature in clearance holes, which is useful in shear-loaded connections. This fastener is sold individually per package with a minimum order quantity of 10 pieces.

Key Features

• Grade 8 steel construction for high tensile strength in demanding bolted joints
• 5/8-11 UNC thread form per standard inch thread specification
• Partially threaded shank for use in shear or locating applications
• Zinc yellow dichromate finish provides corrosion resistance
• Conforms to ASME B18.2.1 dimensional standards
• 4-1/2 inch length under head accommodates thick material stacks

Compatibility

Designed as a standard inch-series hex head cap screw for use in any application requiring a 5/8-11 UNC threaded fastener with a 4-1/2 inch length under head and Grade 8 strength rating.

Installation Notes

Installation should be performed by a qualified mechanic or tradesperson using appropriate hand or power tools rated for 5/8-inch drive. Always confirm the mating nut or tapped hole uses the matching 5/8-11 UNC thread specification before assembly. Apply a calibrated torque wrench to reach the fastener manufacturer or equipment OEM recommended clamp load — do not rely on feel alone for Grade 8 fasteners. De-energize and lock out any equipment before replacing or installing fasteners in live mechanical assemblies.