Specifies requirements for mounting and accuracy of tool-holding chucks for use in machine tools and portable power tools. Five types of chuck are covered: guided three-jaw light duty, guided three-jaw industrial; guided three-jaw, keyless, self-tightening; tap-holding industrial chuck; quick change collet type industrial chuck.Cross References:BS 308BS 891BS 1134BS 1580BS 1660:Part 1BS 1916BS 2556