Accupro 785050 ER40 Collet 0.406 Inch

Product Description

The ACCUPRO 785050 is an ER40 series collet designed for use in CNC machining centers, milling machines, and other spindle-driven equipment that accepts ER40 toolholding systems. With a collet size of 0.406 inches and a minimum collet capacity of 0.375 inches, this collet provides secure clamping for round shank cutting tools within that range. Machining professionals and toolroom technicians rely on ER-style collets for their consistent concentricity and wide clamping range across a single collet. At 0.6 pounds, the 785050 is a single-piece unit sized at 1.75 inches wide by 1.75 inches deep by 2 inches tall.

This collet is suited for general-purpose production machining environments where ER40 toolholding is standard. It is commonly installed in vertical and horizontal machining centers, CNC knee mills, and manual milling machines equipped with ER40 collet chucks or collet nuts. Machinists and toolroom staff working in job shops, production facilities, and maintenance departments will find this collet appropriate for a wide range of end mill, drill, and reamer shanks that fall within the 0.375 to 0.406 inch clamping range.

Key Features

• ER40 collet series for broad compatibility with ER40 toolholding systems
• 0.406 inch collet size with a minimum capacity of 0.375 inches
• Compact form factor: 1.75 inches wide by 1.75 inches deep by 2 inches tall
• Lightweight single-piece construction at 0.6 pounds
• Sold individually — one collet per package

Compatibility

Designed as an OEM-style replacement or standard fitment collet for ER40 collet chucks and collet nut assemblies used in CNC and manual milling machine spindles.

Installation Notes

ER collets are installed by a qualified machinist or toolroom technician. Before inserting or removing a collet, ensure the machine spindle is fully stopped and locked out per facility lockout/tagout procedures. The collet should be seated properly into the collet nut before threading onto the spindle nose — never thread the nut onto the spindle with the collet unseated. Inspect the collet bore and seating surface for chips or damage before each use to maintain concentricity and tool retention.