Counterbore sets

[Aukai]

There are listings for socket head counterbore sets, but I'm having difficulty finding any sets, or descriptions for hex head bolts. I do have a counterbore set to 1/2, but for hex heads that takes my down to 1/4-5/16 hex head territory. Not sure if my search terms are not right, or it's not a popular item. I would like to see if I can get something up to 5/8 bolt with washer diameter.

 

[JimDawson]

They exist, but are expensive. McMaster has adjustable counterbores to 1 5/8 dia. https://www.mcmaster.com/3104A11 https://www.mcmaster.com/3104A14

I normally use an endmill to do what you are looking for.

 

[Aukai]

AHAAA, more than one way to skin a cat.....
I just grabbed 4 box store 5/8 washers, they measure 1.300, to 1.330 was the biggest, I only have ER-40 collets to 1 inch. OH well.

 

[davidpbest]

Same here - use an end mill.

 

[darkzero]

I've got this counterbore set. Just a cheap Chinese set but does the job for me. I would just use end mills before I had this.

 

[Aukai]

There is one just like that one on ebay, but a couple of slots are empty.
I see there are reduced shank end mills also, interesting...

 

[mmcmdl]

Flat bottom end mill Mike !

 

[Aukai]

Flat bottom, center cutting, but will I miss the pilot? Center finding on a hole just adds another step.

 

[ddickey]

You would not move you table after drilling would you?

 

[Aukai]

There may be preexisting holes that need a washer surface, like when I upgraded my axle studs to 5/8" that use shoulder nuts, and spacers depending on wheel thickness. The existing washer facing is not large enough, and there is a hollow under the shoulder nut/spacer. I could not get the flash right, sorry for the poor picture.