ER 40 CNC Collets

ER 40 CNC collets represent the pinnacle of industrial workholding technology, engineered to deliver exceptional clamping capacity and precision for the most demanding manufacturing applications. With their robust 40mm external diameter design, these professional-grade collets provide unmatched holding power and stability for large cutting tools, heavy-duty machining operations, and high-volume production environments where reliability and accuracy are paramount.

The ER 40 collet system offers the most comprehensive size range in the standard ER family, accommodating tool shanks up to 25.4mm (1") diameter with an overall length of 46mm. This extended capacity makes ER 40 collets ideal for large end mills, heavy boring bars, specialized tooling, and industrial applications requiring maximum material removal rates. The collets measure 41mm (1.61") in diameter and maintain the industry-standard clamping range of 0.039" for consistent performance across the entire size spectrum.

Each ER 40 collet features advanced spring steel construction with 16 full-length slits instead of the standard 8 found on competitive products, enabling uniform collapse to provide concentric and full 360° gripping surface. This enhanced design ensures optimal force distribution and superior tool retention even under extreme cutting conditions and high rotational speeds.

Professional ER 40 collets maintain standard 0.0002" TIR (Total Indicated Runout), delivering the precision accuracy required for aerospace, automotive, and medical device manufacturing. The precision-ground internal surfaces and optimized slot geometry ensure consistent concentricity while accommodating the larger tool shanks commonly used in heavy-duty applications.

The robust 46mm length provides exceptional tool support and rigidity, minimizing deflection and chatter during aggressive cutting operations. This extended length is particularly beneficial for applications involving deep cavity machining, where tool stability and vibration control are critical for maintaining dimensional accuracy and surface finish quality.

ER 40 collets are manufactured from premium-grade spring steel with specialized heat treatment processes that optimize hardness distribution while maintaining core toughness. The larger diameter design provides increased contact area and superior moment resistance, enabling higher torque transmission compared to smaller ER systems. Proper installation requires 130 ft/lbs torque specification, reflecting the enhanced clamping forces these collets can generate.

The collapse range design allows each collet to accommodate multiple shank diameters - for example, an ER40 6mm collet can securely grip round shanks from 6mm diameter down to 5.1mm diameter, providing operational flexibility while maintaining optimal clamping performance throughout the range.

ER 40 collets integrate seamlessly with industrial machining centers, production lathes, and specialized manufacturing equipment designed for high-volume operations. Their robust construction and enhanced specifications make them suitable for automated manufacturing systems where reliability and consistent performance are critical for maintaining production schedules and quality standards.

Wurth Baer Machinery's selection of ER 40 CNC collets combines proven industrial engineering with competitive pricing, ensuring manufacturers have access to the premium workholding solutions needed for competitive advantage in demanding production environments. These collets represent the optimal choice for applications requiring maximum capacity, precision accuracy, and industrial-grade reliability.