Parlec 4014TRKC Retention Knob CAT40 5/8-11 Thread

Product Description

The PARLEC 4014TRKC is a Style C retention knob designed for CAT40 toolholders used in CNC machining centers. It features a 5/8-11 thread and a 60-degree angle radius that seats securely against the spindle drawbar. With a knob diameter of 0.588 inches and an overall length of 2.31 inches, this knob is dimensionally precise for consistent pull-force retention. Through-coolant capability with a 0.138-inch coolant hole diameter allows directed coolant delivery when used with compatible toolholders. Licensed machinists and toolroom technicians install this component during toolholder assembly or replacement as part of standard CNC spindle prep.

This retention knob fits CAT40 toolholders in vertical and horizontal machining centers where the 5/8-11 drawbar thread standard is used. It is suited for production environments running through-coolant operations. The 0.635-inch pilot diameter and 1.268-inch knob-to-flange length are dimensioned to meet CAT40 interface geometry. The 0.230-inch flange thickness and 0.393-inch neck diameter are consistent with standard CAT40 retention knob specifications for this thread class.

Key Features

• CAT40 taper size for compatibility with standard CAT40 spindle interfaces
• 5/8-11 thread matches common CAT40 drawbar thread specification
• Through-coolant capable with 0.138-inch coolant hole diameter
• 60-degree angle radius for proper drawbar engagement and pull force distribution
• Style C geometry with 0.635-inch pilot diameter for precise toolholder seating
• 2.31-inch overall length with 1.268-inch knob-to-flange dimension for correct spindle fit

Compatibility

Designed as an OEM-style retention knob for CAT40 toolholders using a 5/8-11 drawbar thread in CNC machining center spindles.

Installation Notes

Installation is performed by machinists or toolroom technicians during toolholder assembly. The machine spindle and drawbar must be fully de-energized and the tool magazine cleared before servicing any retention knob. Use the correct torque wrench and CAT40 toolholder fixture to thread the knob to the manufacturer-specified torque value for the drawbar thread class. Do not overtighten or use impact tools, as this can distort thread engagement or alter pull-force characteristics.