Aerospace Material Specifications (AMS) and American Society for Testing and Materials (ASTM)
AMS Specification
AMS5630
ASTM Specification
ASTM A276 and ASTM A756
Other Similar Steel Balls Include;
250CS 0.250" Dia Chrome Steel 250SS 0.250" Dia 440C Stainless Steel 375CS 0.375" Dia Chrome Steel 375NP 0.375" Dia Ni Plated Steel 375SS 0.375" Dia 440C Stainless Steel 500CS 0.500" Dia Chrome Steel 500NP 0.500" Dia Ni Plated Steel 500SS 0.500" Dia 440C Stainless Steel