Value Collection 451043BR Hex Cap Screw 1-1/4-12 X 4 in Grade 8

Product Description

The VALUE COLLECTION 451043BR is a hex head cap screw sized 1-1/4-12 x 4 inches, manufactured from Grade 8 steel with a bright, uncoated finish. This fastener features partial threading and conforms to ASME B18.2.1 standards, making it a reliable choice for high-strength bolted connections in demanding mechanical and structural assemblies. The UNF thread form at 1-1/4-12 provides fine-thread engagement suitable for applications requiring greater tensile strength and vibration resistance than coarse-thread equivalents. It weighs 1.89 pounds and is driven with a 1-7/8 inch hex key or wrench. Installers and maintenance technicians working in heavy equipment, industrial fabrication, or trade construction will find this fastener meets standard torque and load requirements for Grade 8 applications.

This cap screw is suited for use in high-load bolted joints across industrial, mechanical, and construction environments. Its partial threading allows for a smooth shank section between the head and the threaded portion, which is advantageous when the bolt passes through clearance holes before engaging a nut or tapped component. The 4-inch length under head accommodates thicker flanges, brackets, and structural members. Grade 8 steel provides significantly higher proof load and tensile strength compared to Grade 5 or lower designations, making this fastener appropriate for critical joint applications subject to vibration, shock, or sustained clamping loads.

Key Features

• Grade 8 steel construction for high tensile strength and proof load capacity
• 1-1/4-12 UNF thread form for fine-thread engagement and improved vibration resistance
• Partially threaded shank for clean passage through clearance holes
• Bright, uncoated finish — compatible with standard hardware pairing without coating interference
• Conforms to ASME B18.2.1 dimensional standards
• 1-7/8 inch hex drive accommodates standard open-end, box-end, or socket wrenches

Compatibility

Designed as a standard ASME B18.2.1 hex head cap screw for use with 1-1/4-12 UNF nuts and tapped holes in high-strength bolted assemblies.

Installation Notes

Installation should be performed by qualified mechanical or maintenance technicians familiar with high-strength fastener torque procedures. De-energize and lock out any equipment before servicing fastened assemblies. Use a calibrated torque wrench and apply fastener torque values appropriate for Grade 8 steel and the joint material per applicable engineering specifications. Do not mix Grade 8 fasteners with lower-grade nuts, as mismatched hardware reduces joint integrity.