Quote:
Originally Posted by Jack Gifford
The only early forgings I know of were the '58-62 rods.  |
I had one set of the poor steel 421 connecting rods.
Tested them with a Rockwell C tester and they were very soft material.
HRC (Hardness Rockwell C) vs HRB (Hardness Rockwell B).
More info here:
https://en.wikipedia.org/wiki/Rockwell_scale
Without reading all of the info here is a quick snapshot:
HRB 100 1⁄16 in (1.59 mm) ball Copper alloys, soft steels, aluminum alloys, malleable iron 130 500
HRC 150 spheroconical diamond† Steel, hard cast irons, pearlitic malleable iron, titanium, deep case-hardened steel,
other materials harder than 100 HRB 100 500
We used to call them Pontiac "Rubber Rods"
Tom V.
I gave them to a Lake Michigan guy to use as the "weight end" of a "Seine Net" to catch bait fish.