This International Standard specifies, for classical and narrow V-belts of sections
Y (for groove profile with datum width 5,3 mm)
Z (for groove profile with datum width 8,5 mm)
A (for groove profile with datum width 11 mm)
B (for groove profile with datum width 14 mm)
C (for groove profile with datum width 19 mm)
D (for groove profile with datum width 27 mm)
E (for groove profile with datum width 32 mm)
SPZ (for groove profile with datum width 8,5 mm)
SPA (for groove profile with datum width 11 mm)
SPB (for groove profile with datum width 14 mm)
SPC (for groove profile with datum width 19 mm)
— the recommended datum lengths;
— the tolerances for datum lengths;
— the conditions for measuring the datum length.
It is important that narrow belts are not used with pulleys uniquely designed for classical belts.
This International Standard (a combination of previous ISO Recommendations) does not imply that classical V-belts can be used as replacements on drives designed for the use of narrow V-belts.