Help! 3-jaw chuck key size for 6” super spacer

Mill
1

I have a 6” super spacer with the integral 3-jaw. I say integral as it is the one that replaces the table when installed, not the newer add-on one that bolts to the table. I got it without the chuck key that allows you to move the chuck jaws. I measured and could have sworn I got 1/2”. But I tried using a 1/2” square key and it wouldn’t go in.

Anyone know what size chuck key this thing is supposed to take?

2

Literally any size that will fit in there. You might just grind down the one you have until it fits.

3

I don’t have any except that half inch. But truth, grinding one out won’t hurt!

4

It’s probably 12mm. I have a chuck (of unknown origin) that has a 12mm square key.

5

You were right! Ordered a 12mm key and it fits like a glove! Thank you for the recommendation.

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