This International Standard specifies the principal dimensions of grooved pulleys for classical V-belts (sections Y, Z, A, B, C, D and E) and narrow V-belts (sections SPZ, SPA, SPB and SPC).
It is important that narrow belts are not used with pulleys uniquely designed for classical belts.
DS/ISO 4183:1982 history
1982DS/ISO 4183:1982 Grooved pulleys for classical and narrow V-belts