3V/5V/8V Wedge Belts

Standardisation/Dimensions. The three wedge belt profiles standardised in the USA are 3V/9N, 5V/15N and 8V/25N. The cross section dimensions of these belts and the according length only partially conform to the profiles and lengths of the wedge belts DIN 7753 Part 1. The profile 3V/9N roughly corresponds to SPZ; and 5V/15N to profile SPB. There is no comparable DIN/ISO wedge belt profile for 8V/25N.

It is possible to use belts in profile 3V/9N and 5V/15N in SPZ-Z/10 or SPB-B/17 pulleys, respectively; but the use of SPZ or SPB belts in ARPM/MPTA standard pulleys is not generally recommended. The top width of the American pulley grooves is smaller than that of the corresponding DIN/ ISO pulleys. This can cause wear on the upper edges of SPZ and SPB belts and can lead to premature failure. Due to its cross section, the optibelt SK wedge belt in SPB profile is also suitable for 5V/15N pulleys. Note: Electrically conductive according to ISO 1813

3V/5V/8V Wedge Belts