Value Collection 49183 Hex Head Cap Screw Grade B7 Steel

Product Description

The VALUE COLLECTION 49183 is a heavy hex head cap screw designed for high-strength bolting applications where reliable clamping force and material integrity are critical. Manufactured from Grade B7 alloy steel and left uncoated, this fastener meets ASTM A193 standards, making it suitable for use in high-temperature and high-pressure environments such as pressure vessels, flanged pipe connections, and industrial equipment assemblies. The thread size is 1-1/4-8 UNC with a length under head of 5-1/2 inches. Installation is performed by millwrights, pipefitters, and mechanical contractors working on bolted flange assemblies and structural connections.

This cap screw is commonly used in industrial and commercial applications including petrochemical piping systems, pressure vessel flange bolting, pump and valve assemblies, and heavy mechanical equipment installations. The ASTM A193 Grade B7 designation indicates the fastener is engineered for elevated-temperature service and is a recognized standard in process piping and pressure boundary work governed by ASME and ANSI codes. The uncoated finish makes it compatible with field-applied lubricants or thread compounds as required by the application specification.

Key Features

• ASTM A193 Grade B7 alloy steel construction for high-temperature and high-pressure bolting service
• 1-1/4-8 UNC thread form for broad compatibility with standard heavy hex nuts
• 5-1/2 inch length under head accommodates thick flange and structural assemblies
• Uncoated finish allows field application of anti-seize compound or specified thread lubricant
• Sold in a package quantity of 5, with no minimum order beyond 1 package

Compatibility

Designed as a standard ASTM A193 Grade B7 alloy steel hex head cap screw for use with matching heavy hex nuts in UNC 1-1/4-8 thread configurations across industrial bolted flange and pressure vessel assemblies.

Installation Notes

Installation should be performed by qualified millwrights, pipefitters, or mechanical technicians following applicable ASME, ANSI, or plant-specific bolting procedures. Depressurize and isolate the system completely before disassembly or fastener replacement on any pressure boundary connection. Use calibrated torque tooling and apply only the thread lubricant or anti-seize compound specified by the engineering or maintenance procedure for the assembly. Do not substitute Grade B7 fasteners with lower-grade hardware in pressure-rated or elevated-temperature service without engineering approval.