Accupro 785057 ER40 Collet 0.781 Inch

Product Description

The ACCUPRO 785057 is an ER40 series collet designed for use in CNC machining centers, milling machines, and other rotating spindle equipment that accept ER40 toolholders. It holds cutting tools and workholding shanks with a collet capacity of 0.75 inches minimum and a nominal clamping size of 0.781 inches. Manufactured to ER40 standard dimensions, this collet delivers consistent concentricity and clamping force across a wide range of cutting applications. The collet measures 1.75 inches in width and 1.75 inches in length, with a height of 2 inches, and weighs 0.6 pounds.

This collet is suited for use in production machine shops, tool rooms, and maintenance environments where ER40 collet chucks are standard equipment. It is appropriate for both light finishing passes and moderate material-removal operations. Machinists, CNC operators, and tool-and-die technicians working with ER40-compatible spindles and collet chucks will find this a direct-fit replacement or spare for everyday toolholding setups.

Key Features

• ER40 collet series — fits all standard ER40 collet chucks and toolholders
• 0.781 inch nominal clamping diameter with 0.75 inch minimum collet capacity
• Compact form factor: 1.75 inches wide, 1.75 inches long, 2 inches tall
• Lightweight at 0.6 pounds — easy handling during tool changes
• Single-piece packaging — sold individually (quantity of 1)

Compatibility

Designed as an OEM-style replacement collet for use in any machine spindle or toolholder conforming to the ER40 collet standard.

Installation Notes

ER40 collets are installed by qualified machinists or CNC technicians. Always power down and lock out the spindle drive before changing collets. Ensure the collet, nut, and chuck bore are clean and free of chips or debris before seating the collet, as contamination directly affects runout and clamping force. Do not exceed the rated clamping torque for the ER40 nut as specified by the toolholder manufacturer.