Gibraltar 9530-G Rolling Ball Clamping Screw 1/4-20 Steel

Product Description

The GIBRALTAR 9530-G is a headless rolling ball end clamping screw designed for secure workholding and fixturing applications in machine tools, jigs, and fixtures. The headless body accepts a 1/8-inch hex key for installation and adjustment, while the rolling ball tip allows the screw to apply even clamping pressure against a workpiece without marring the surface. The screw has a 1/4-20 UNC thread and an overall length of 0.5 inches. The ball measures 0.157 inches in diameter and is made from stainless steel. The screw body is steel with a black oxide finish for corrosion resistance. This fastener is installed by machinists, toolmakers, and mechanical assembly technicians.

The 9530-G is suited for light-duty clamping and positioning tasks in machining, tooling, and mechanical assembly environments. The rolling ball design allows the tip to pivot slightly as clamping load is applied, making it effective where the clamping surface is not perfectly perpendicular to the screw axis. It is commonly installed in drill jigs, fixture plates, and adjustment mechanisms where a standard set screw would damage or gouge the mating surface.

Key Features

• Headless body driven by a 1/8-inch hex key for flush or recessed installation
• Rolling stainless steel ball tip applies pressure without gouging or marring workpiece surfaces
• 1/4-20 UNC thread for broad compatibility with standard tapped holes
• 0.5-inch overall length suits compact fixture and tooling applications
• Black oxide finish on steel body provides mild corrosion resistance
• 0.157-inch ball diameter for consistent point contact under clamping load

Compatibility

Designed as a direct-fit replacement or standard-specification clamping screw for any application requiring a 1/4-20 UNC headless rolling ball end style fastener in machining fixtures, jigs, and positioning assemblies.

Installation Notes

Installation requires a 1/8-inch hex key. Thread the screw into a pre-tapped 1/4-20 UNC hole and tighten until the ball tip contacts the workpiece with the desired clamping force. Do not over-torque, as excessive load can damage the rolling ball seat or deform lightweight fixture materials. Follow applicable machine shop safety procedures and de-energize or lock out any associated equipment before adjusting clamping screws in active fixturing setups.