Accupro 588244 ER40 Collet 0.31 Inches

Product Description

The ACCUPRO 588244 is an ER40 series collet designed for use in CNC machining centers, milling machines, and other rotating spindle equipment. It accepts tooling with a decimal inch size of 0.31 inches and a minimum collet capacity of 0.281 inches, making it suitable for a range of cutting tools within that grip range. The ER40 designation indicates the collet series and corresponds to a standardized external taper and clamping nut thread size widely used across compatible toolholders. Machinists and tooling specialists install this collet as part of a precision workholding or tool-clamping setup where consistent runout control and secure tool retention are required.

The ACCUPRO 588244 is used in production machining environments, job shops, and maintenance facilities running equipment that accepts ER40 collet systems. Typical applications include end mill holding, drill chuck setups, and reamer holding in both vertical and horizontal machining centers. Its 0.31-inch capacity covers a common fractional and near-fractional tool shank size, making it a frequently stocked item in tooling inventories for general-purpose metal and composite machining operations.

Key Features

• ER40 collet series with standardized external taper for wide toolholder compatibility
• 0.31-inch decimal inch collet size with a minimum capacity of 0.281 inches
• 300 PSI rated pressure for secure clamping during cutting operations
• Compact and lightweight at 0.85 pounds for easy handling and quick changeouts
• Single-piece packaging with a minimum order quantity of one unit

Compatibility

Designed for use with ER40 series toolholders and compatible clamping nuts that accept the ER40 collet taper. Specific machine or toolholder model compatibility was not stated in the product data; verify that your toolholder is rated for the ER40 collet series before installation.

Installation Notes

Installation is performed by qualified machinists or tooling technicians familiar with ER collet systems. Power down and de-energize the spindle completely before inserting or removing collets. Use the appropriate ER40 clamping nut and torque wrench designed for the collet series; do not over-tighten by hand without proper tooling. Inspect the collet bore and toolholder taper for debris or damage before seating the collet to ensure accurate runout and secure tool retention.