Heavy-duty series according to old standard DIN 703.With allen set screw made from steel zinc-plated, like DIN EN ISO 4027, but strength 12.9. From size d1=70mm with 2 set screws, with offset 135°.Blank turned and kalibrated. Bores tolerance H8. Large chamfer on one side of the outside diameter. Temperature range: -40°C to +175°C.