The maximum torque is laser marked on the ER collet nut face to take the guess game out of the way to ensure proper amount of force should be applied while tightening.
Asymmetrical O-Ring
Internal clamping ring's shape is design to minimize out-of-balance compare to the standard off-center o-ring design from other standard ER collet nut, achieving 12,000 RPM without needed to drill holes on the collet nut body when placed on a dynamic balanced machine to preserve ER collet nut's body strength.
Grind Finish
The face of the ER collet nut is precision grind on achieve the visual appealing.
High speed collet nut with slot groove to be compatible with standard ER collet wrench, instead of incurring extra expense on a needle bearing wrench
The maximum torque is laser marked on the SK collet nut face to take the guessing game out of the way to ensure proper amount of force shoud be applied while tightening