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Old Spec H.R.S. SDP 258

Old Spec H.R.S. SDP 258

(OP)
Has anyone come across this material spec before:

H.R.S. per SDP 258
Cyanide harden SDP 46

Parts of it are obvious. This spec came off a 30+ year old Volvo GM Heavy Truck drawing. We used to source this through a company that is out of business but not since 2000 (We bought way too many then).

Is this a GM spec? I need to replace it with a more modern callout but would like to have some property information before doing so.

-- TIA --

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