Here's a couple but wow they're expensive. Perhaps try asking AvE himself?
AMF chuck wrench with holder for ER40 type 1/2 inch torque wrench
Collet wrench (AMF 52340) With square drive torque wrench for clamping nuts (ER) in accordance with DIN 6499 ✓ Fast delivery ✓ Trade customers ▶ Order online today!www.hahn-kolb.de
I've been researching that and have found that 80 lb/ft is recommended for ER32. Most manufacturers I found said 15% less than standard nuts. The problem is that torque wrenches and the matching drive end wrenches are expensive. I'm thinking about cutting off the spanner of a wrench and welding a 1/2" square socket to it. The measured distance between the center of the spanner wrench and the square socket must be accurate to calculate the actual torque setting required on the torque wrench. Then doing the math for the adapter length using my normal 1/2" drive torque wrench. I already have 5 torque wrenches 0 lb/in to 250 lb/ft I just can't justify another expensive setup.
