Accupro 587501 ER40 Collet 0.157 Inch 4.00mm

Product Description

The ACCUPRO 587501 is an ER40 series collet designed for use in CNC machining centers, milling machines, and other rotating spindle equipment that accept ER40 toolholding systems. This collet holds cutting tools and workholding shanks with a nominal bore of 0.157 inches (4.00mm) and delivers a total indicator runout (TIR) of 0.01mm, supporting precision work in production and toolroom environments. The minimum collet capacity is 0.118 inches (3.0mm), giving the collet a clamping range suited to small-diameter end mills, drills, and reamers. Machinists and toolroom technicians install this collet into compatible ER40 chucks as part of routine tooling setups.

This collet is used in residential shop, commercial production, and industrial machining applications wherever an ER40 chuck system is in service. Typical install scenarios include tool changes on vertical and horizontal machining centers, manual mills, and lathe live tooling heads that use the ER40 standard. The 0.157-inch bore size targets tooling with 4.00mm shanks, a common metric shank diameter found in drills, end mills, and other rotary cutting tools. Each package contains one collet.

Key Features

• ER40 collet series — fits any ER40-standard chuck body
• 0.157 inch (4.00mm) nominal bore for 4.00mm shank tooling
• 0.01mm TIR for consistent tool concentricity and surface finish
• Minimum clamping capacity of 0.118 inches (3.0mm)
• Sold individually — package quantity of one collet per order

Compatibility

Designed as a direct-fit collet for any ER40-standard collet chuck. No specific model numbers or system families were provided in the product data.

Installation Notes

ER40 collets are installed and removed by machinists using the appropriate ER40 spanner nut and collet chuck wrench. Before changing tooling, ensure the spindle is fully stopped and machine power is in a locked-out, tagged-out state per applicable safety procedures. Do not exceed the tool shank diameter rated for this collet bore, and inspect the collet seating surface and chuck bore for chips or damage before each use. Proper torque on the retention nut is critical to runout performance — follow the chuck manufacturer guidelines for nut tightening.