Accupro 784917 ER20 Collet 0.438 Inch

Product Description

The ACCUPRO 784917 is an ER20 series collet designed for precision workholding in CNC machining and milling applications. It accepts tooling with a decimal inch size of 0.438 inches and provides a minimum collet capacity of 0.422 inches, allowing it to grip a range of shank diameters within that range. Machined to ER20 specification, this collet fits standard ER20 collet chucks and tool holders used in production and job-shop environments. Installation and setup are handled by machinists and CNC operators. The collet measures 1.9 inches in height and 1.2 inches in width and length, and weighs 0.05 pounds.

ER20 collets are widely used in CNC milling machines, machining centers, and drill presses that accept ER20-style collet chucks. This collet is suited for light to medium cutting operations in both production and manual machining setups. It is sold individually and is appropriate for shops that need a single replacement or a specific size addition to an existing ER collet set. Compatible with any ER20 collet chuck that conforms to standard ER20 geometry.

Key Features

• ER20 collet series for use with standard ER20 collet chucks
• Nominal collet size of 0.438 decimal inches
• Minimum collet capacity of 0.422 inches for gripping smaller-diameter shanks
• Compact form factor: 1.9 inches height, 1.2 inches width and length
• Lightweight at 0.05 pounds for easy handling and chuck balance
• Sold as a single unit for targeted size replacement

Compatibility

Designed for use with standard ER20 collet chucks and tool holders that conform to ER20 collet geometry specifications.

Installation Notes

ER20 collets are installed by machinists or CNC operators using the appropriate ER20 collet nut and spanner wrench. Always ensure the spindle is fully stopped and the machine is powered down before changing collets. Inspect the collet and chuck bore for debris or damage before seating the collet. Do not exceed the collet's stated capacity range, as over-clamping can damage both the collet and the tool shank.