Techniks 47.122.20.800 ER20 Collet Chuck CAT50

Product Description

The TECHNIKS 47.122.20.800 is an ER20 collet chuck built on a CAT50 dual contact taper shank for use in CNC machining centers. It accepts ER20 collets with a capacity range from 1/16 inch minimum to 0.512 inches maximum, covering a wide range of cutting tool shank diameters. The 8-inch projection positions the cutting tool well clear of the spindle nose, making it well suited for deep-cavity work or setups where clearance is a priority. Through-coolant capability delivers cutting fluid directly to the tool tip. The chuck weighs 9.3 pounds and has an overall installed length of 12 inches.

This collet chuck is intended for use in production and job-shop CNC machining environments where ER20 tooling is standard. The CAT50 dual contact taper shank engages both the taper and the spindle face simultaneously, increasing rigidity and reducing runout compared to a standard single-contact taper. This design is commonly specified on heavy-duty vertical and horizontal machining centers running aggressive milling, drilling, or reaming operations where tool stability and repeatability are critical.

Key Features

• ER20 collet system accepts tool shanks from 1/16 inch to 0.512 inches
• CAT50 dual contact taper shank for enhanced rigidity and face contact
• 8-inch projection for deep-reach and clearance-critical setups
• Through-coolant design directs fluid to the cutting zone
• 12-inch overall length for consistent gage-line measurement
• Nut tightening torque specification of 59 foot-pounds for proper collet clamping

Compatibility

Designed for CNC machining centers equipped with CAT50 dual contact taper spindles and configured to accept ER20 collets and standard ER20 nuts.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician with the spindle fully powered down and locked out per facility lockout/tagout procedures. Tighten the ER20 collet nut to the specified torque of 59 foot-pounds using a calibrated ER collet nut wrench - do not use improvised tools that can damage the nut or collet taper. Inspect the collet, chuck bore, and taper shank for contamination or damage before seating; debris on the taper or face contact surface will directly affect runout and holding force. Verify through-coolant passages are clear and that the machine spindle coolant circuit is rated for the flow path before enabling coolant.