Description
Narrow V-belts, section SPZ (9.7 × 8 mm, width × height), made to DIN 7753 / ISO 4184: for the same width they transmit more power than classic sections and allow more compact drives. Available in 66 lengths.
- SectionSPZ
- Width × height9.7 × 8 mm
- Lengthsfrom 587 to 3550 mm
- Sizes66
Features
- Trapezoidal flanks that wedge into the pulley groove: more tension, more grip
- Taller, narrower profile than classic belts: more power per belt and higher belt speeds
- High-strength tension cords embedded in the compound, for minimal stretch over time
- Quiet running and absorption of jolts at start-up
- They slip if the machine jams, protecting the motor and drive components
Typical applications
Operating conditions
| Section | SPZ (9.7 × 8 mm) |
|---|---|
| Standard | DIN 7753 / ISO 4184 |
| Lengths | from 587 to 3550 mm (pitch length Ld) |
| Belt speed | Up to about 40 m/s |
| Ambient temperature | Approximately -30 to +70 °C |
| Pulleys | With a groove for section SPZ: many DIN 2211 pulleys accept both the classic section and the corresponding narrow one (Z/SPZ, A/SPA, B/SPB), but check the groove profile |
| Environment | Dry and clean: oils, greases and solvents damage the compound |
Advantages
- More power per belt: fewer belts or narrower pulleys
- Higher belt speeds than classic belts
- More compact, lighter drives
Limitations
- Needs retensioning after running-in and periodic checks
- With several belts in parallel, they must all be replaced together
- Does not tolerate oils, excessive heat or worn pulleys
How to read the size
In narrow sections the number is the pitch length (Ld) in millimetres: SPZ 587 = 587 mm measured on the pitch line of the belt.
Technician's tipThe code is printed on the back of the old belt: if it is illegible, measure the belt with a tape measure run at half the belt height, or send us a photo. On multi-belt drives fit new belts that are all identical: a new belt next to a worn one does all the work and does not last long.
Speeds and temperatures are indicative values for rubber V-belts: for critical drives, ask us for a calculation.
