Value Collection 204-4012 ER40 Collet 3/16 Inch

Product Description

The VALUE COLLECTION 204-4012 is an ER40 series collet designed to hold workpieces or cutting tools with a 3/16 inch (0.1870 decimal inch) shank diameter. It delivers a total indicator runout (TIR) of 0.0005 inches, providing the concentricity required for precision milling, drilling, and boring operations. ER40 collets are a widely adopted standard in CNC machining centers and manual milling machines alike. Machinists and tool-and-die technicians install this collet into a compatible ER40 collet chuck to secure tooling during metal cutting, woodworking, or composite machining operations.

This collet is suited for use in ER40 collet chuck holders mounted on vertical or horizontal machining centers, CNC mills, manual knee mills, and lathes equipped with a live tooling turret. The 3/16 inch bore size makes it appropriate for small-diameter end mills, drill bits, and other round-shank tooling of the same nominal size. It is a practical choice in production shops, tool rooms, and maintenance environments where consistent tool-holding accuracy is needed across repeated setups.

Key Features

• ER40 collet series for use with standard ER40 collet chuck holders
• 3/16 inch (0.1870 decimal inch) bore accommodates common small-diameter tooling shanks
• 0.0005 inch TIR supports precision concentricity in machining applications
• Single-piece collet construction for direct insertion into an ER40 chuck
• Weighs 0.66 pounds for easy handling and tool-change efficiency

Compatibility

Designed for use with ER40 collet chuck holders that accept the standard ER40 collet form factor. Confirm chuck series and bore size before installation.

Installation Notes

ER collets are installed by machinists or toolroom technicians using the appropriate ER40 collet nut and spanner wrench. Power down and lock out the machine spindle before inserting or removing any collet. Inspect the collet bore and chuck taper for chips or debris before seating the collet, as contamination directly affects runout. Do not exceed the rated clamping range for the collet bore size.