Gibraltar 821117-G Cap Screw Hook Clamp Assembly

Product Description

The GIBRALTAR 821117-G is a cap screw hook clamp assembly designed for secure workholding and fixturing applications in machining and fabrication environments. Built from carbon alloy steel with a black oxide coating, this clamp assembly resists corrosion and wear under shop conditions. It features a 1/2-13 threaded body with a 0.999 inch body diameter and a 2-9/16 inch body length. The assembly includes the cap screw, making it a ready-to-install unit. Machinists, toolmakers, and fixturing technicians use this type of clamp to hold workpieces firmly to machine tables, jigs, and fixtures during milling, drilling, and grinding operations.

This cap screw hook clamp assembly is suited for use on manual and CNC machine tool setups where reliable clamping force and repeatable positioning are required. The 13/16 inch clamp face height and 3/4 inch clamp face width make it appropriate for standard T-slot fixture setups and general workholding rigs. The 1/2-13 thread size is a common inch-series standard, making this assembly compatible with a wide range of shop hardware and clamping kits already in use in most machining operations.

Key Features

• Carbon alloy steel construction for strength and durability under clamping loads
• Black oxide coating provides corrosion resistance in shop environments
• 1/2-13 inch-series thread for broad hardware compatibility
• Includes cap screw — no additional fastener required for installation
• 13/16 inch clamp face height and 3/4 inch clamp face width for precise workholding contact
• 0.999 inch body diameter and 2-9/16 inch body length suit standard fixturing setups

Compatibility

Designed as an OEM-style replacement or direct-use component for standard 1/2-13 threaded workholding and fixture clamping systems used in general machining and fabrication applications.

Installation Notes

Installation is typically performed by a machinist or toolroom technician. Before installing or repositioning this clamp assembly, ensure all machine power is off and any moving components are fully stopped. Use appropriate torque procedures per your shop standards when securing the cap screw to avoid over-stressing the clamp body. Inspect the clamp face contact area and T-slot or fixture surface for cleanliness and proper seating before applying clamping force.