Accupro 785044 ER40 Collet 0.5 Inch

Product Description

The ACCUPRO 785044 is an ER40 series collet designed for use in CNC machining centers, milling machines, and other rotating spindle equipment that accept ER40 toolholders. The collet accepts shank diameters at a nominal size of 0.5 inches (1/2 inch) with a minimum collet capacity of 0.469 inches, providing the clamping range typical of the ER40 standard. At 0.6 pounds, the collet measures 2 inches in height and 1.75 inches in both width and length. ER collets are the most widely used toolholding format in production and job-shop environments, and this unit is installed by machinists and CNC setup technicians.

This ER40 collet is suited for horizontal and vertical machining centers, manual knee mills, and high-speed spindle applications where a reliable ER40 toolholder nut system is already in use. It is appropriate for both production runs and prototype work where consistent tool runout and repeatable clamping force are required. The 0.5-inch nominal size accommodates standard end mills, drills, and round-shank cutting tools within the stated capacity range.

Key Features

• ER40 collet series for compatibility with ER40 toolholders and collet chucks
• Nominal collet size of 0.5 inches (1/2 inch) with a minimum capacity of 0.469 inches
• Compact form factor: 2 inches height, 1.75 inches width, 1.75 inches length
• Lightweight at 0.6 pounds for reduced spindle load contribution
• Single-piece collet sold individually (quantity of 1)

Compatibility

Designed as an OEM-style replacement and standard fitment collet for ER40 series toolholders and collet chucks accepting a 0.5-inch nominal shank diameter.

Installation Notes

Installation is performed by a machinist or CNC setup technician. The spindle must be powered down and brought to a complete stop before collet changes. The collet should be seated fully into the ER40 nut before threading onto the toolholder; never tighten the nut without the collet and tool properly seated. Use a calibrated ER collet torque wrench appropriate for the ER40 nut size to achieve proper clamping force.