HTA is a common marking on Parkers. Not explicitly known but the consensus seems to be Heat Treated something or other that starts with an A. Edgar can chime in for a more detailed explanation on that one.

Or what Dean said.

And several years ago Dave Suponski suggested Heat Treated and Annealed…





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Hi Jim! Good seeing you on here.

Heat Treated and Annealed. Annealing is a specific process, which follows Heat Treatment for mechanical properties. That term is no longer used in that context, replaced by 'Stress Relieved', though the term is still used signifying a 'draw' cycle, meaning to 'soften'.

Thank you all for your responses and insights! This is why this forum is so valuable - the expertise and opinions are as priceless as our Parkers - where would we be without them?

Hey, Mike - great to "see" you, too!