"PURPOSE: To publish established manufacturing tolerances. APPLICATION: Tolerances shown herein shall apply@ unless otherwise agreed upon by purchaser and vendor. The term ""excl"" is used to apply only to the higher figure of the specified range. The general temper designation ""-TX51"" is used for brevity and denotes the full temper designations -T351@ -T451@ -T651@ -T851@ and ?CT7531@ the ""X"" representing one or more digits preceding the ""51"". There are not established tolerances for straightness of bars and rods and for twist of bars in the -0 temper."