AUTOMOTIVE & INDUSTRY
V-Belt Types
V-Belt
Timing Belts
Poly-V Belt
Timing Belt & Timing Belt Kit
Combine Harvester Belts
Mill Roller Belts
Belt types
Belt types as they appear across our pages, our product examples include V-belts, timing belts, mill roller belts, combine harvester belts, Poly-V belts and timing belt kit examples.
Gear and chain compatibility, you can see that the belt models featured here perform a functionally similar role. Belt models, which are more flexible than chains, are presented to you as part of a system that delivers positive results in faster, high-speed motor operations.
The V-belt plays an important role in motor vehicles. Drawing power from the crankshaft and delivering it to the alternator, water pump and fan, these systems are known for their high rotational speed and high efficiency.
Chains and belts, which serve as power transmission components, enable power to be transferred with high efficiency and without loss. The timing belt, which operates with gear mechanisms, functions as a time-adjusted system depending on gear size and rotational speed. A wide variety of belt types are used in machinery and other technologies, particularly in the automotive industry.
Belt types and for more, we look forward to welcoming you to our company.
Under efficient and advantageous working conditions, belt types always play and fulfil an important role. The rotational power taken from a pulley or gear is transferred to other systems, allowing power performance to be preserved during transfer.
Belt Models and Types
Belt types that are compatible with the system they are connected to support the transfer of power and the healthy operation of the system. Belt types, which need to be kept taut, ensure that power is transferred while being preserved.
For this reason, in addition to vehicles such as combine harvesters, belt types play an important role in the operation of many vehicles and machine systems in the automotive sector. Belts, regarded as power transmission components and materials, work in perfect harmony with the engine gear.
This provides an important advantage in terms of system and energy efficiency.
Belt types, which are compatible with pulley and gear models, have a flat or toothed structure that allows them to integrate easily into the system they are connected to.
The motion created by rotation is transmitted through these belt types as a very high-performance power transmitter, delivering power without any loss whatsoever. Operating under tension, belts carry the momentum received from a pulley or gear to the area or system where it is needed, without loss. Despite operating under very demanding conditions, belts transmit power with the highest possible performance and provide high efficiency.
What Material Are Industrial Belt Models Made From?
Belt types are used in the operation of industrial machinery and systems, particularly in the automotive sector. Belt models manufactured from rubber and Kevlar-corded polyurethane material have a highly resistant structure against stretching and loosening. Thanks to the high-quality raw materials used, belts prove to be a product that is highly resistant to friction and wear.
The ratio of raw materials used during belt production and the consistency of this material are of great importance. The material being 100% homogeneous is essential for the product's sturdy structure. If these factors are not given due attention during production, the belt may develop premature breakage issues. In addition to such problems, stretching and loosening issues may also occur.
Our Belt Types And Product Catalogue
As a company, we offer a very wide range of belt types. Customer requirements are our top priority when it comes to supply. Belt models, varieties and delivery to the exact size requested are matters our company attaches great importance to. In addition to our sturdy and high-quality belt models, we are committed to delivering products in precisely the size requested.
Our products are designed to meet customer requirements in the most suitable way, with quality and warranty coverage. In terms of a timed rotational effect, the belts will deliver a result highly compatible with the system they are connected to.
You can browse the products in our belt category and request the models that meet your needs from us right away. Product quality combined with affordable pricing applies to all our products.
We offer belt models that play a key role in the operation of a vehicle or the performance of a machine. Our sample products, built to last and offering long-term use, await you on our pages. You can get in touch with our company right away regarding our products and convenient purchasing. Our quality, reliable products will be presented to you in the most suitable way.
What Are the Types of Belts?
Belts used in industrial power transmission fall into two main groups according to whether they transmit motion by friction or by positive engagement. Friction-driven belts (V-belt, Poly-V) allow slight slip and absorb shock; positive-engagement belts (timing, i.e. toothed belts) allow no slip and provide positional accuracy.
Correct belt selection depends not only on the power to be transmitted and the speed, but also on the centre distance between shafts, the operating temperature and the ambient conditions. Below you will find the distinguishing features, profile dimensions and selection criteria for each belt family.
V-Belt (Classical and Narrow Profile)
The V-belt is the most common power transmission belt, with a trapezoidal cross-section that seats into the pulley groove with a wedging action. The lateral pressure it applies to the groove surface generates a high frictional force.
Classical V-belt profiles
| Profile | Top width (mm) | Height (mm) | Typical use |
|---|---|---|---|
| Z (10) | 10 | 6 | Small machine tools, fans, domestic appliances |
| A (13) | 13 | 8 | General-purpose industrial drives |
| B (17) | 17 | 11 | Medium-power compressors, pumps |
| C (22) | 22 | 14 | Heavy-duty use, crushers, mills |
| D (32) | 32 | 19 | High-power industrial drives |
Narrow (Wedge) Profile V-Belts
SPZ, SPA, SPB and SPC profiles transmit higher power than classical profiles in the same space. The cross-section is deeper and narrower, so the contact area with the groove surface increases, carrying more torque at the same pulley diameter.
| Profile | Top width (mm) | Height (mm) | Equivalent to |
|---|---|---|---|
| SPZ | 9,7 | 8 | Reinforced version of the Z profile |
| SPA | 12,7 | 10 | In place of profile A |
| SPB | 16,3 | 13 | In place of profile B |
| SPC | 22 | 18 | In place of profile C |
The code on the belt gives the profile and length together. For example, in SPA 1250 the code, SPA denotes the profile and 1250 the effective length (Ld, mm). Both the profile and the length must be specified when ordering.
Timing (Synchronous/Toothed) Belt
A timing belt engages the pulley teeth with the teeth on its inner surface, transmitting motion without slipping. It is the mandatory choice in applications where position must be maintained (camshaft drive, positioning systems, synchronous lines).
| Profile family | Pitches | Feature |
|---|---|---|
| T (metric trapezoidal) | T2.5 / T5 / T10 / T20 | General positioning, light to medium load |
| AT (reinforced trapezoidal) | AT5 / AT10 / AT20 | Wider tooth base, high torque |
| HTD (round tooth) | 3M / 5M / 8M / 14M | High power, low noise |
| Inch (classic) | XL / L / H / XH | Common on older and imported machines |
Profile families are not interchangeable: an HTD 5M belt will not fit a T5 pulley. When replacing a belt, it must be confirmed that the pulley profile is from the same family.
A timing belt code generally carries three pieces of information: length, profile and width. For example, 450-5M-15 in the code stands for 450 mm effective length, 5M profile and 15 mm width.
Poly-V (Ribbed) Belt
A Poly-V belt is made up of thin V-ribs arranged side by side. It combines the flexibility of a single wide belt with the load-carrying capacity of a multi-strand V-belt. Its slim profile allows it to run on small pulley diameters, saving valuable space.
| Profile | Rib pitch (mm) | Typical use |
|---|---|---|
| PH | 1,60 | Small appliance drive |
| PJ | 2,34 | White goods, light industry |
| PK | 3,56 | Automotive auxiliary drive |
| PL | 4,70 | Medium-power industry |
| PM | 9,40 | Heavy industry drive |
The code is read as follows: 1270 PJ 6 → 1270 mm length, PJ profile, 6 ribs.
Combine Harvester and Mill Roller Belts
Agricultural and milling applications impose conditions different from standard industrial belts. Combine harvester belts operate under dust, straw residue and variable load, so they require higher wear resistance and flexibility. Mill roller belts, on the other hand, must run under continuous load while maintaining a precise speed ratio.
In these groups, the belt is usually supplied in the special size specified by the machine manufacturer. If the code on a removed belt cannot be read, its equivalent is determined by measuring the inner circumference length and cross-section size.
What Should Be Considered When Choosing a Belt?
- Power and speed to be transmitted: Motor power and speed are the starting point for profile selection.
- Service factor: Shock loading, all-day operation and frequent start-stop cycles raise the service factor.
- Centre distance: At too short a distance, the belt wrap angle drops and the risk of slipping increases; at too long a distance, vibration occurs.
- Pulley diameter: The minimum pulley diameter specified by the manufacturer must not be gone below; otherwise fatigue cracking occurs in the belt body.
- Ambient conditions: Where there is oil contact, high temperature or ozone exposure, a belt with special compounds is selected.
Belt Tension and Alignment
Most belt failures stem not from the belt itself but from installation:
- Loose belt: Slipping, heating, glazing on the side faces and a whistling sound. Power transmission drops.
- Over-tensioning: Bearing load increases, shaft and bearing life shortens, and the belt body fatigues.
- Axial misalignment: Wear and fibre breakage on one edge of the belt. Pulleys must be aligned to the same plane using a straightedge.
- Dirty groove: Rust and residue in the pulley groove damage the contact surface and increase slippage.
In multi-belt systems, belts must always be replaced as a matched set. When an old belt runs alongside a new one, the new belt carries most of the load and fatigues quickly.
When Should a Belt Be Replaced?
- Glazing or hardening on the side faces
- Cracking, splitting or broken fibres in the belt body
- In toothed belts, cracking at the tooth root and a worn tooth profile
- A belt seated at the bottom of the pulley groove (indicating a worn cross-section)
- Repeated, recurring loss of tension
Belt or Chain: Which Should You Choose?
If both belt and chain are being considered for the same line, the decision is made on these criteria: for high torque, low speed, an oily and hot environment, and short centre distance chain; for lines with high speed, long centre distance, where lubrication is undesirable and quiet operation is required a belt is preferred.
For more detail on this comparison and on selecting connecting elements, see our power transmission components: selecting timing pulleys, taper lock and bushings article. For chain-driven solutions, transmission chains our page is the go-to reference.
Frequently Asked Questions
What Is the Difference Between a V-Belt and a Timing Belt?
A V-belt transmits motion through friction and allows a small amount of slip, whereas a timing belt forms a positive, tooth-engaged connection and does not slip. Timing belts are preferred in applications where position must be maintained, while V-belts are preferred where shock absorption is required.
How Do I Read a Belt Code?
For a V-belt, the code gives the profile and the effective length (SPA 1250 → SPA profile, 1250 mm). For a timing belt, the length, profile and width are listed in order (450-5M-15). For Poly-V, the code gives the length, profile and number of ribs (1270 PJ 6).
Can a Narrow Profile Belt Be Used Instead of a Classical Profile?
It can be used if the pulley groove is also suitable for the narrow profile, and this generally allows higher power transmission. If the groove profile differs, the belt will not seat correctly in the groove and the pulley must be replaced along with the belt.
How Is Belt Tension Checked?
In practice, the amount of deflection produced when the midpoint of the belt is pressed with a finger is measured and compared with the manufacturer's value. In precision applications, a frequency meter or a tension gauge is used.
Why Are Belts Replaced as a Set?
A used belt has stretched; when it runs together with a new one, the new belt carries most of the load. This imbalance significantly shortens the new belt's service life.