Info on ER16/20 Hex Collet Torque
This information is from Maritool's website www.maritool.com.
Maritool makes outstanding tools at a great price. I highly recommend you visit them. Especially those using the new Tormach MX with BT30 tooling.
https://www.maritool.com/faq/collet-questions Question #2
How much should I torque ER style collets nuts?
The following torque ratings are for solid ER style collets nuts. Bearings collets nuts are not as strong so reduce these values 15%
When clamping on shanks 30% smaller than collets maximum capacity, reduce torque value 40%.
In most cases a light oil film on tool holder thread is adequate. Collet and collet seat should be clean and dry.
Below values can be exceeded 5% when using our full round torque wrench adapters.
ER8 10-12 FT-LBS
ER11 15-25 FT-LBS
ER11M 15-20 FT-LBS
ER16 30-45 FT-LBS
ER16M 25-35 FT-LBS
ER20 50-55 FT-LBS
ER20M 40-48 FT-LBS
ER25 70-80 FT-LBS
ER32 90-110 FT-LBS
ER40 100-130 FT-LBS
ER50 140-150 FT-LBS