Gibraltar 821107-G Cap Screw Hook Clamp Assembly

Product Description

The GIBRALTAR 821107-G is a cap screw hook clamp assembly designed to secure workpieces, fixtures, and components in machining, fabrication, and industrial clamping applications. Built from carbon alloy steel with a black oxide finish, it delivers corrosion resistance and surface hardness suited to shop-floor conditions. The assembly features a 5/16-18 threaded cap screw, a body diameter of 0.624 inches, and a body length of 1.375 inches. The clamp face measures 0.5 inches in height and 0.4375 inches in width. A cap screw is included with the assembly. This part is installed by machinists, toolmakers, and industrial maintenance technicians.

This clamp assembly is used in workholding setups on milling machines, drill presses, surface grinders, and similar machine tools. It is suited to both production and maintenance environments where secure, repeatable clamping is required. The compact body dimensions make it practical in tight fixture layouts where larger clamp styles cannot be used. The black oxide carbon alloy steel construction holds up in environments with cutting fluid exposure and regular handling.

Key Features

• 5/16-18 thread size for compatibility with standard T-slot hardware and clamping studs
• Carbon alloy steel construction for strength under clamping load
• Black oxide finish provides corrosion resistance and low-reflectance surface
• Compact body diameter of 0.624 inches fits tight fixture layouts
• Cap screw included — no additional fastener hardware required
• Clamp face height of 0.5 inches and width of 0.4375 inches for controlled contact area

Compatibility

Designed as an OEM-style replacement or direct-fit component for standard cap screw hook clamp setups using 5/16-18 threaded hardware in industrial workholding applications.

Installation Notes

Installation is performed by machinists or toolroom technicians familiar with workholding setup procedures. Ensure the machine table or fixture is de-energized and all moving axes are locked before positioning the clamp. Use appropriate T-slot nuts or clamping studs rated for the thread size. Do not exceed the clamp's rated capacity, and inspect the screw threads and clamp face for wear before each use.