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Material Coefficients of Thermal Expansion are: Chromium Carbide 4.7 x 10-6 inch/ºF per inch SAE 52100 Steel 6.4 x 10-6 inch/ºF per inch Ceramic 5.5 x 10-6 inch/ºF per inch
The above replacement grades are suggested in B89.1.9. However, the tolerances specified in GGG- G-15C and B89.1.9 are not exactly the same. Gage blocks meeting B89.1.9 specifications may not meet GGG-G-15C requirements and vice versa.