Precise Pro-Series High Accuracy ER-20 1/8″ Spring Collet – 3901-5182

• AA Grade.
• 5 Micron.
• Superior finish.
• Runout is less than or equal to .0002″.
• Made of high grade SUJ2 steel.
• Hardened and precision ground to 44-48HRC.
• Exceeds Federal Specifications.
• Inside diameter is ground to reach mirror finish increasing grip force.
• Surface treated to reduce rust and improve hardness.
• Cryogenic treatment to significantly increase wear resistance.
• Collet must be assembled into collet chuck nut before inserting into the collet chuck.
• Major diameter is .830″.
• Overall length is 1.230″.

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