Blue Tempered Spring Steel Shim 0.003" Thick x 3.0" Width x 60" Length
Thickness Tolerance ±0.0003"
Width tolerance is ±0.010". Length tolerance is ±1/2".
C1095 Blue Tempered and Polished Spring Steel.
Rockwell hardness C 50.
MIL-S-7947, AISI-1095,
SAE- 1095, and AMS-5122.