Gibraltar 20417G Step Block Clamp Set 52 Pc 5/8-11

Product Description

The GIBRALTAR 20417G is a 52-piece step block and clamp set designed for workholding applications on milling machines and machining centers equipped with T-slot tables. The set uses 5/8-11 stud thread and fits 13/16-inch T-slots, making it compatible with a wide range of industrial machine tool tables. Step block width is 1 inch, and studs are available in six lengths ranging from 3 inches through 8 inches. This kit provides the core components needed to fixture workpieces securely during milling, drilling, and boring operations. It is typically installed and configured by machinists and tool and die professionals.

This set is suited for job shop, production, and maintenance machining environments where a versatile, ready-to-use clamping solution is needed. The included variety of stud lengths and step block configurations allows the user to accommodate workpieces of varying heights and profiles on a standard T-slot machine table. The complete component count reduces the need to source individual clamp hardware separately, making it practical for both setup technicians and general machine operators.

Key Features

• 52-piece complete set covering studs, clamps, step blocks, and hardware in one package
• 5/8-11 stud thread for secure engagement with T-slot nut and coupling hardware
• Fits 13/16-inch T-slot tables common on knee mills and bed mills
• Six stud lengths included: 3, 4, 5, 6, 7, and 8 inches for varied workpiece heights
• Includes serrated end clamps for firm, bite-resistant grip on workpieces
• T-slot cleaner included to help maintain clean, accurate T-slot engagement

Compatibility

Designed for use with machine tool tables featuring 13/16-inch T-slots and 5/8-11 threaded stud hardware, which is a standard configuration found on many knee mills, bed mills, and surface grinders.

Installation Notes

Installation is performed by qualified machinists or setup technicians. Before configuring workholding, ensure the machine is powered down and all moving axes are locked or at rest. T-slots should be cleaned of chips and debris prior to inserting T-slot nuts to ensure proper seating and accurate clamping force. Do not overtighten studs or clamp bolts beyond snug-plus-firm hand torque without a verified torque procedure, as thread damage or workpiece distortion may result.