Specifications

China Factory best seller BT30-ER40 collet chuck 

Basic Material : 20CrMnTi
Hardness  : HRC56-60
The depth of carburizing : more than 0.8mm
According to the need to do the precise dynamic balance , G2.5.20000-50000RPM
Togehter with the AAA level (0.005mm) collet, obtain better processing effect




 
Description

BT tooling comes in a range of sizes designated as BT30, BT40, BT50, etc, and uses the same NMTB body taper as CAT, BT tooling is symmetrical about the spindle axis. This gives BT tooling greater stability and balance at high speeds. BT tool holders will accept both imperical and metric sized tools, BT tooling looks very similar and can easily be confused with CAT tooling. The difference between CAT and  BT is the flange style, thickness, and the thread for the pull stud is a difference size. BT tool holders use metric thread pull stud. 
Features
 
1.BT NO taper shank is in conformity with AT3 standard;
 
2.Balanced to 25,000 RPM at G2.5
 
3.T.I.R. 0.005 mm measured from taper to collet pocket
 
4.ER collet chucks handle a wide range of machining jobs without having to buy new tool holders. Simply choose the right size collet for the job, set tool depth, and tighten the collet nut and pull stud to the proper torque using a torque wrench and tightening fixure.