This SAE Recommended Practice pertains to blast cleaning and shot peening and provides for standard cast shot and grit size numbers. For shot@ this number corresponds with the opening of the nominal test sieve@ in ten thousandths of inches1@ preceded by an S. For grit@ this number corresponds with the sieve designation of the nominal test sieve with the prefix G added. These sieves are in accordance with ASTM E 11. The accompanying shot and grit classifications and size designations were formulated by representatives of shot and grit suppliers@ equipment manufacturers@ and automotive users. 1 Example: S-550 indicates a cast steel shot identified by a nominal sieve opening of 0.0555 in.