upon further examination these screws are only on my bits with a 3/4 shank
Screws in bits
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Hi, the threads and nut are for adding a bearing. You can use different bearings to offset the cutter, or if its the same size as the cutter, to restrict the depth of the cut. The most common bits like this are used to cut rabbets to a fixed depth. FYI, here's a picture that might be helpful. Shanks are the part that goes into the collet and they are almost always 1/4 or 1/2 inch in diameter or metric 8mm or 12mm. Collets are extremely precise devices, The difference on inside dimension open vs closed is a few thousandths of an inch. If a collet is damaged in any way, it should be replaced.
![397780]()
sorry I should have mentioned the screw and nut are at the top of the shank that goes into the collet. like this one
![397784]()
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