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Older Wilson Rockwell Hardness Testers

SilveradoHauler

Cast Iron
Joined
Jan 6, 2008
Location
Mountains of Washington State, USA
Recently purchased a Wilson 3PR in excellent condition with a lot of accessories. C and D scales.

I have a manual and all the good stuff and know how to use it.

However I would enjoy learning what the model number designations mean.

I have read that the R refers to a standard Rockwell tester.

S refers to Superficial.

Do not know what the 3 refers to or what the P refers to.

I have searched for a few hours, both on this site and with Google. Not too much info out there about the designation numbers.

Anyone have any info?

Thanks!
 








 
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