Sunday, April 17, 2011 Bosch CK2 Quick Change Conversion Kit Review

Average Reviews:

(More customer reviews)Something I don't understand about the CK2 kit is that the washers included for the small adapter nuts are too large to fit properly.

The CK1 kit which includes 4 large nuts without the locking pins is equally lacking and comes with no washers at all. Someone at Bosch didn't think these kits through properly. I would have included small washers with the small nuts and large washers with the large nuts and added more threads to the nuts to compensate for the thickness of the washer.

As could be expected from a quick change system, run-out with the hole saws can be an issue. Some adapter nuts are made better than others and you'll find that you can reduce or eliminate the run-out by rotating the adapter nut to one of the other 5 hex positions possible in the mandrel. Sometimes this works, sometimes not. Either way it partially defeats the purpose of a quick change system wasting some time testing if the hole saw runs true. This is why I gave the product 4 out of 5 stars. Be sure that the top of your hole saw is flat (paint even, etc) so as not to further compound the run-out (something Bosch has probably taken into consideration with their own hole saws).

Something else I have noticed about the Bosch holes saws with the power change adapter nuts, is that of the three nuts (small, large, large with w/ locking pin), Bosch always uses a nut with no-pins and adds a washer even though the hole saws have been drilled for the pins. This is obviously a cost saving measure but I wonder if the addition of the thin washer improved contact and reduces the chance of run-out.

If you don't have a set of hole saws with these adapters I'd recommend buying a complete Bosch set that does rather than select a favorite brand of hole saws and try to adapt them to this quick change system.

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Product Description:
Quick change conversion kit includes 2 small adapters for hole saw sizes 9 16" to 1 3 16" hole saws and 4 large adapters for hole saw sizes 1 1 4" to 6". These adapter nuts allow virtually any hole saw to use the Bosch quick change system.