ER collets are widely used in the clamping systems. They belongs to DIN6499B standard.
There are different models: ER8, ER11, ER16, ER20, ER25, ER32, ER40, ER50.
There are three levels of runout, standard runout 0.015mm, higher level 0.01mm and 0.005mm.
The hardness is HRC44-48. Material: 65Mn.
Different ER collet sizes make ER collet set
usually ER11 1-7mm 13pcs , ER16 1-10mm 10pcs , ER20 2-13mm 12pcs ,ER25 2-16mm 15pcs ,ER32 3-20mm 18pcs ,ER40 4-26mm 23pcs .
