Value Collection 581757BR Hex Socket Cap Screw 7/8-9 Unc

Product Description

The VALUE COLLECTION 581757BR is a hex socket cap screw designed for high-strength bolted connections in industrial, mechanical, and structural applications. This fastener features a 7/8-9 UNC thread size with a 1-1/2 inch length under head and is partially threaded for positive clamping force. Manufactured from alloy steel with a black oxide finish, it delivers corrosion resistance and a clean appearance. The 3/4-inch hex drive socket interface allows for high-torque installation with standard hex keys or drive tools. Licensed tradespeople and maintenance mechanics typically install this screw in machinery, equipment frames, and heavy assemblies.

This screw is suited for residential and commercial mechanical installations where a strong, recessed-head fastener is required. The partially threaded shank provides shear strength across joints and is a common choice in equipment assembly, jig and fixture work, and structural bolting. The alloy steel construction and black oxide coating make it appropriate for both interior and moderate-exposure environments where paint or plating is not required.

Key Features

• 7/8-9 UNC thread size for high-load applications
• 1-1/2 inch length under head, partially threaded shank
• Alloy steel construction for high tensile strength
• Black oxide finish provides mild corrosion resistance
• 3/4 inch hex drive for high-torque installation
• Meets ASME/ANSI B18.3 and ASTM A574 standards

Compatibility

Designed as an OEM-style replacement or direct-use hex socket cap screw for industrial machinery, structural assemblies, and equipment requiring a 7/8-9 UNC partially threaded fastener with a 3/4 inch hex drive.

Installation Notes

Installation should be performed by a qualified mechanic or tradesperson using an appropriately rated 3/4 inch hex key or socket drive tool. Always confirm the mating thread and hole depth before installation to avoid cross-threading or bottoming out. Follow applicable torque guidelines from the equipment manufacturer or relevant ASME standards when tightening. Ensure all equipment is de-energized and load-free before replacing or installing structural fasteners.