Value Collection 49170 Hex Head Cap Screw 1-1/8-8 X 4 in Grade B7

Product Description

The VALUE COLLECTION 49170 is a heavy-duty hex head cap screw designed for high-strength fastening applications where reliable clamping force and material integrity are critical. Manufactured from Grade B7 alloy steel to ASTM A193 standards, this fastener meets the requirements of pressure vessels, flanges, heat exchangers, and structural assemblies that demand verified tensile and yield strength. The 1-1/8-8 thread designation indicates a 1-1/8 inch nominal diameter with 8 threads per inch (UNC), and the screw measures 4 inches in length under head. The bright, uncoated finish is suitable for environments where a supplemental coating will be applied or where galvanic concerns favor bare steel contact.

This screw is used in industrial, mechanical, and process piping applications where high-temperature or high-pressure service conditions are present. ASTM A193 B7 fasteners are a standard specification in oil and gas, chemical processing, and power generation industries. Plumbers, pipefitters, millwrights, and mechanical contractors install these fasteners when assembling flanged pipe connections, valve bodies, pressure equipment, and heavy machinery. Sold in a package quantity of 5 with a minimum order quantity of 1 package.

Key Features

• Grade B7 alloy steel construction meets ASTM A193 specification for elevated-temperature and high-pressure service
• 1-1/8-8 UNC thread form provides coarse-pitch engagement suitable for heavy structural and mechanical joints
• 4-inch length under head accommodates thick flanges, gasketed joints, and stacked components
• Bright, uncoated finish allows for field application of specified coatings or platings as required by the installation spec
• Packaged in quantities of 5 per pack with a minimum order of 1 pack

Compatibility

Designed as an OEM-style and maintenance replacement fastener for bolted flange assemblies, pressure vessel closures, and structural connections that specify ASTM A193 Grade B7 hex cap screws in 1-1/8-8 UNC thread size.

Installation Notes

Installation should be performed by a qualified pipefitter, millwright, or mechanical contractor following applicable ASME, ANSI, or facility-specific bolting procedures. Depressurize and isolate all lines or assemblies before removing or replacing fasteners on live systems. Use calibrated torque equipment and follow the joint assembly torquing sequence specified by the equipment manufacturer or applicable code. Do not substitute Grade B7 fasteners with lower-grade hardware in applications where ASTM A193 compliance is required.