1994 Johnson/Evinrude "ER" 60 thru 70 outboards Service Repair Manual P/N 500609, Page 143Get this manual
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10 mmI3B")
16mm,15B")
Cold Roll Steel Heat Treatment:Carburize 0,3-0,5 mm (0.015-0.020 in deep Quenchand harden to 58 -62 "" case