Value Collection 581877BR Hex Socket Cap Screw 1-1/8-7 Unc

Product Description

The VALUE COLLECTION 581877BR is a hex socket cap screw designed for heavy-duty fastening applications where high clamping force and a low-profile head are required. It features a 1-1/8-7 UNC thread with 6 inches of length under the head and a partially threaded shank. The 7/8-inch hex drive accepts a standard hex key or socket driver. Constructed from alloy steel with a black oxide finish, this fastener meets ASME/ANSI B18.3 and ASTM A574 standards. It is suitable for use in structural assemblies, machine frames, and industrial equipment where tensile strength and corrosion resistance are priorities.

This screw is used in industrial and commercial mechanical assemblies that require a flush or recessed fastener head. The partially threaded shank is appropriate for clamping applications where the unthreaded section spans two mated components. Licensed machinists, millwrights, pipefitters, and general contractors commonly install fasteners of this type in equipment mounting, structural steel connections, and heavy machinery maintenance. The coarse UNC thread pitch speeds installation in field conditions and resists cross-threading.

Key Features

• 1-1/8-7 UNC coarse thread for fast engagement and field-reliable installation
• Partially threaded shank provides accurate clamping across mated joint surfaces
• 7/8-inch hex socket drive compatible with standard hex keys and socket drivers
• Alloy steel construction meets ASTM A574 high-strength fastener specification
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• Conforms to ASME/ANSI B18.3 socket cap screw dimensional standards

Compatibility

Designed as an OEM-style replacement or service fastener for industrial machinery, structural assemblies, and mechanical equipment requiring a 1-1/8-7 UNC hex socket cap screw with a 6-inch length under head.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a calibrated torque wrench and the appropriate 7/8-inch hex key or bit socket. De-energize and lock out all equipment before fastener removal or replacement per applicable OSHA lockout/tagout procedures. Thread engagement and torque values should be determined from the applicable engineering specification or fastener manufacturer torque table for the joint material and finish. Do not substitute a fastener of lower grade in applications rated to ASTM A574.