Accupro ER40HP 06.35 ER40 Collet 1/4 Inch

Product Description

The ACCUPRO ER40HP 06.35 is an ER40 series collet designed to hold 1/4-inch shank tooling in CNC machining centers, milling machines, and other rotating spindle equipment. The collet delivers a total indicator runout (TIR) of 0.0002 inches (0.0050 mm), supporting accurate, repeatable tool holding for precision cutting operations. At 46.0 mm overall length, it seats fully within a standard ER40 collet chuck nut and clamping body. Machinists and tool-room technicians install this collet when setting up end mills, drills, reamers, or other 1/4-inch shank cutting tools that require tight runout control.

This collet is suited for general-purpose and precision machining applications in both production and job-shop environments. It is used wherever an ER40 collet chuck is mounted on a vertical or horizontal machining center, lathe live tooling, or dedicated drill-and-tap spindle. The 1/4-inch bore size accommodates standard fractional shank tooling commonly used in light milling, drilling, and reaming operations. It is a direct fit for any ER40-compatible chuck body meeting DIN 6499 or ISO 15488 standards.

Key Features

• ER40 series collet for 1/4-inch shank tooling
• TIR of 0.0002 inches (0.0050 mm) for precise, repeatable tool holding
• Overall length of 46.0 mm to fully engage standard ER40 collet nut
• Compatible with ER40 collet chuck bodies across major machine platforms
• Sold as a single collet unit (package quantity of 1)

Compatibility

Designed as a direct-fit replacement collet for any ER40-compatible collet chuck body. Specific machine model compatibility was not provided in the product data.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Power down and lock out the machine spindle before installing or removing any collet. Inspect the collet, chuck body, and clamping nut for chips, burrs, or damage before seating the collet. Use the correct ER40 spanner wrench to tighten the collet nut to the chuck manufacturer's specification; do not over-tighten by striking the wrench.