All shanks hard turned (for smooth running!). With Balluffchip bore and coolant duct bores.
The double contact between the taper
and the flat flange creates a more stable and precise clamping situation:
- Better surface quality
- Longer tool life times
- Consistent seating in the headstock (even at high speeds)
- Smaller radial run-out
A BT double contact arbor can also be used in a standard BT machine spindle – and vice versa. The advantages of the double contact are however achieved only when a double contact arbor and double contact spindle are used together.
Pull studs (PS) No. 308760 − 308806. Special toggle spanner No. 309840.