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New 3 1/2" jaws?

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I bought a vise with no maker mark and it was missing jaws. It is 3 1/2" and the mounting holes are 2 1/4" on center. Can't seem to find anything online. I guess I could make some but wouldn't I want to have them hardened? Anyone know if a source for pre-made jaws?
 

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#2
Mild steel jaws work just fine, though they may not last long enough if used all day, every day.
 
#3
I bought piece of 1"x2" flat bar from hobby metals for mine and have been very happy with the jaws that they turned into.
 
#4
Dan , make a steel set and a few aluminum sets of soft jaws .
 
#5
Any suggestions on type of steel and aluminum? Lots to choose from.
 
#6
Hot rolled mild steel (A36) is too gummy and is difficult to get a good finish, even when grinding it. Cold rolled mild steel like 1018 works good, but can bend like a banana if you cut only one face, due to internal stresses. 6061-T6 or 7075-T6 (or T651 for either) will work well. 7075 is harder and stronger aluminum than 6061. I used 1/2 x 2 x 6+" 1018 for my 6" Bridgeport vise, and milled the working faces true after installation with the side of a sharp 1" carbide end mill. They still look and work fine after 5+ Years of use. No complaints, they grip well and do the job they need to do. Should I ever crash a cutter into them, it will be less dramatic than if they were hardened.
 
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