A case-hardened pin reads soft on a Rockwell C test. The spec is a case depth of a few tenths and a surface hardness. The C scale ball is denting through the case. A file test feels hard.
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A deep-reading scale on a thin case measures the core. Use the scale and load meant for a shallow case, or a microhardness traverse if the spec is a case depth. A soft C reading here is the wrong test, not a failed heat treat.
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The file test is a clue, not a cert. Send the right test before you reheat-treat a lot that may be fine.
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Put the test method next to the hardness call on the router so the next pin is not punched through.
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