[How-To] Tool steel

[benmychree]

I vote for its use as a parallel

 

[Dabbler]

you might know someone with a brand new surface grinder, and can user it to practice grinding skills... just sayin'...

 

[DavidR8]

you might know someone with a brand new surface grinder, and can user it to practice grinding skills... just sayin'...

Now that sounds like a great idea!
I would have had it together today but I'm renovating a bathroom

 

[Jim F]

Thanks gents, as always H-M comes through with a wealth of information.
@francist it's possible it's HSS but the edges are all broken so I think it was shop made item.
I have a few pieces of tooling that were part of the random stuff. This piece is unique in that it's just a rectangular block, the other are all machined into purpose-built shapes.

I got some similar items with my mill, some are hard, some are soft......

 

[DavidR8]

I took a close look at it tonight and discovered that there’s a pair of initials (I think) stamped into the end.

 

[Jim F]

I took a close look at it tonight and discovered that there’s a pair of initials (I think) stamped into the end.

One of the pieces I have has engraving that it is a certain deg for a 5" sine bar.