After finding a number of references to ER collet nuts "must be wanged up real tight" I thought it would be good idea to find out and share what people really think should be the torque and how to apply tight

Centaur precision tools say this Max. Tightening Torque (ft. lbs.)

ER11 -20

ER16 - 40

ER20 -60

ER25 - 70

ER32 -80

ER40 -90

parlec say this

ER11 -22

ER16 - 52

ER20 -74

ER25 - 86

ER32 -100

ER40 -146

Regofix give slightly different numbers again

all of them warn against overtightening!

Centaur precision tools say this Max. Tightening Torque (ft. lbs.)

ER11 -20

ER16 - 40

ER20 -60

ER25 - 70

ER32 -80

ER40 -90

parlec say this

ER11 -22

ER16 - 52

ER20 -74

ER25 - 86

ER32 -100

ER40 -146

Regofix give slightly different numbers again

all of them warn against overtightening!

## Comment