Gives the dimensional, mechanical and electrical requirements for non-perforated blank and pre-recorded magnetic tape and for the associated sound recording and reproducing systems and includes the methods of measurement and necessary tolerances to ensure the interchangeability of recordings.Cross References:BS 308:Part 2BS 3939BS 4727:Part 3:Group 08BS 4727:Part 3:Group 10BS 5550:Subsection 5.1.1BS 5942:Part 4BS 6397BS 6840:Part 2BS 6840:Part 11BS 6840:Part 12BS 6840:Part 15ISO 370ISO/R 1101/1ISO 1101/2ISO/R 1660ISO/R 1661IEC 27