Value Collection 39243 Hex Cap Screw 1-1/4-7 X 4-1/2 Grade 8

Product Description

The VALUE COLLECTION 39243 is a partially threaded hex head cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. Built from Grade 8 steel with a zinc yellow dichromate finish, this fastener delivers high tensile strength and corrosion resistance suitable for demanding environments. The 1-1/4-7 UNC thread and 4-1/2-inch length under head make it appropriate for heavy-duty bolted connections where precise clamping force and fastener integrity are critical. Manufactured to ASME B18.2.1 standards, it meets dimensional and mechanical requirements expected by trade professionals working in fabrication, equipment assembly, and maintenance applications.

This screw is suited for structural and mechanical assemblies requiring a large-diameter, high-strength fastener. The partial threading allows for a smooth shank section, which is beneficial in applications requiring the shank to pass through clearance holes or where shear loading is a factor. Typical installation scenarios include heavy equipment mounting, steel fabrication, industrial machinery assembly, and maintenance work where Grade 8 strength is specified by engineering or code requirements. Sold in a package quantity of 5.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• Zinc yellow dichromate finish provides corrosion resistance
• Partially threaded shank accommodates clearance-hole and shear-load applications
• 1-1/4-7 UNC thread form for compatibility with standard inch-series nuts and tapped holes
• Manufactured to ASME B18.2.1 dimensional standards
• Package quantity of 5 per order unit

Compatibility

Designed as a standard inch-series hex head cap screw for use with 1-1/4-7 UNC nuts and tapped holes in Grade 8 or equivalent structural and mechanical assemblies.

Installation Notes

Installation is typically performed by millwrights, ironworkers, or maintenance mechanics using standard hex wrenches or impact tooling sized for 1-1/4-inch hex fasteners. Always verify that mating nuts, washers, and tapped holes are rated for Grade 8 loads before assembly. Ensure mating surfaces are clean and free of debris to achieve proper seating and clamping force. Follow applicable engineering specifications or structural codes for torque requirements, as no torque value is specified for this fastener in the available data.