Value Collection 451191BR Hex Head Cap Screw Grade 8

Product Description

The Value Collection 451191BR is a Grade 8 steel hex head cap screw with a 1-14 UNF thread and a 6.5-inch length under the head. It is partially threaded and left uncoated (bright finish), conforming to ASME B18.2.1 dimensional standards. Grade 8 fasteners deliver high tensile strength for demanding structural and mechanical assemblies. This screw is driven with a 1.5-inch hex key and is suited for heavy-duty bolted joints in industrial, agricultural, and mechanical equipment applications. Machinists, millwrights, and maintenance technicians are the primary installers of fasteners in this class.

This hex head cap screw is intended for use in high-load, vibration-prone bolted connections where Grade 8 tensile strength is specified. The 1-14 UNF thread form provides finer thread engagement than coarse-thread equivalents, making it well suited for precision clamping applications and situations where controlled preload is critical. The uncoated bright finish is appropriate for indoor or protected environments and for assemblies where secondary coating or plating will be applied after installation.

Key Features

• Grade 8 steel construction for high tensile and proof-load strength
• 1-14 UNF thread form for fine thread engagement and controlled preload
• 6.5-inch length under head accommodates deep or thick-stack assemblies
• Partially threaded shank allows bearing-surface clamping without thread engagement through the full grip length
• Bright uncoated finish meets ASME B18.2.1 dimensional standards
• Driven with a 1.5-inch hex wrench for positive, high-torque installation

Compatibility

Designed as an OEM-style or MRO replacement hex head cap screw for heavy-duty bolted assemblies requiring a 1-14 UNF Grade 8 fastener conforming to ASME B18.2.1.

Installation Notes

Installation should be performed by a qualified millwright, machinist, or maintenance technician familiar with high-strength fastener torque requirements. Power down and de-energize or depressurize any equipment before disassembling bolted joints. Use a calibrated torque wrench and consult the applicable equipment manufacturer torque specification for Grade 8 fasteners of this diameter and thread pitch before tightening. Avoid mixing Grade 8 fasteners with lower-grade nuts or flanges not rated for the corresponding load.