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Shadow:
I worked for a short while at a bolt distributor. Rather than rely on my memory I did a search and found this chart (printable).

http://www.nutsandbolts.com/v1-bolt-grade-markings.html

My imported set from MSC has 3/8"x16 UNC.

Bogstandard:
http://www.shars.com/products/view/2278/255075_Economy_Block_w_23_holes

But even these have the 3/8 x 16 UNC threads.

AdeV:
Has anyone here ever actually USED a bolt in a 1-2-3 block? And if so... what for?

Bogstandard:
Ade,

They were originally designed to bolt together, so you could make them up into accurate angle plates etc.

Then the balls up came, and stopped them doing that dead in their tracks.

I don't know if ever there were any manufactured that could be bolted together.

I don't know if the 2-4-6 blocks suffer from the same problem.


John

John Stevenson:
Yes they could, I have one original set of Starrett blocks here that are made correctly in that the non threaded holes are 3/8" dead.

Also have two other sets that can't as they are all 3/8" tapping  size  :(  I can't comment on the 2 - 4 - 6 blocks as I don't have a set, too big for what I do.

I can see what's happened, these have been sent to China and put on a VMC for machining and to save time they have just used one drill but then they have been copied all over, even being exported to India. Can't see it getting rectified any time soon, if ever.

The factories probably don't even know they are wrong, any feedback goes to a reseller / trading house / importer who just ignores it whilst it doesn't affect sales.

John S.

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