Two belts can have the same cleat height, the same pitch and the same belt width, and still behave differently on the same incline. The difference is the profile: the shape of the cleat where it meets the product.
Profile selection is a product-handling decision before it is a welding decision. The profile has to hold the product, release it at the discharge, survive the return path and match the belt material. Height and spacing come after that.
Key Takeaways
– Flat cleats suit low angles and products that need a simple, clean pocket.
– Triangular cleats are a good default for free-flowing bulk on moderate inclines.
– T-type and C-type profiles hold difficult products but are harder to clean and inspect.
– The profile must match the belt polymer. PVC/PU cleats are welded; rubber cleats are vulcanized.
Quick Answer: Match Profile to Angle and Product
For a shallow incline and a product that sits flat, use a flat cleat. For free-flowing bulk at 15–35°, use a triangular cleat. For sticky, fibrous or irregular material at 25–45°, consider a T-type. For fine, wet or cohesive material at 30° and above, a C-type with a sidewall is often the better combination.
These are starting points. A profile that works for grain may fail for wet sand, and a profile that holds boxes may damage them at the discharge.
Flat, Triangular, T-Type and C-Type Cleats Compared
Flat cleats are simple rectangular bars. They create a straight pocket wall, release product cleanly and are easy to inspect. They are the least aggressive profile, so they are best at low angles or with products that do not roll.
Triangular cleats have a sloping face. The slope helps the cleat enter the material without pushing the whole bed forward, and it can reduce product damage. The shape is self-cleaning in many bulk duties, but the point can wear faster than a flat top.
T-type cleats have an overhanging top section. The overhang creates a pocket that holds material even when the cleat is not very tall. That helps with sticky or irregular products, but the underside of the T is difficult to clean. It can also trap stringy material and create a bacterial growth point in food applications.
C-type cleats have a curved or re-entrant profile that cups the material. They are effective for fine, wet or cohesive products on steep inclines. The trade-off is cleaning: the curve and the undercut hold residue, so the belt needs a documented washdown procedure.
Incline Angle Ranges for Each Profile
| Profile | Typical incline | Best product fit | Cleaning / release |
|---|---|---|---|
| Flat | 0–20° | Boxes, bags, parts | Easy; open surface |
| Triangular | 15–35° | Grain, aggregate, bulk | Good; self-cleaning shape |
| T-type | 25–45° | Sticky, fibrous, irregular | Harder; undercut traps material |
| C-type | 30–50°+ | Fine, wet, cohesive bulk | Best with sidewall; more crevices |
The angle ranges overlap because the product matters more than the angle. A flat cleat can hold a box at 30° if the box is heavy and the belt speed is low. A triangular cleat can fail at 20° if the material is round and free-flowing.
Above 45–50°, a cleat alone may not be enough. A sidewall creates a contained channel and lets the belt carry a deeper bed. The cleat then supports the bed rather than holding the entire load.
Product Size, Weight and Stickiness
The profile has to match the product’s shape. A large, rigid product needs a flat, strong face. A small, round product needs a pocket that prevents rolling. A sticky product needs a profile that releases, not one that grips harder.
Weight affects the cleat base. A heavy product on a tall T-type cleat creates a large moment at the weld. If the belt is light, the cleat may flex and crack at the base. A lower, wider profile can be stronger even if it looks less aggressive.
Stickiness is the hardest variable to predict. A profile that holds wet clay may also hold it after the discharge, which leads to carryback and cleaning downtime. In food handling, a profile with crevices may fail a hygiene audit even if it conveys well.
Cleat Height and Base Width Selection
The base width determines the weld area and the stiffness of the cleat. A wider base spreads load into the belt and resists peeling. A narrow base concentrates stress and can act as a hinge.
As a starting point, use the cleat maker’s base width for the selected height. Do not machine a narrow base to fit a tight pitch; change the pitch or the profile instead. A cleat that is tall relative to its base is more likely to crack at the root.
Height and pitch are covered in detail in our cleat height and spacing guide. This article stays on profile shape so the two decisions do not get mixed.
Sidewall and Cleat Combinations
A sidewall is not a substitute for a cleat, and a cleat is not a substitute for a sidewall. The sidewall contains material at the edges; the cleat carries it up the incline.
For a C-type profile on fine bulk, a sidewall is often part of the same design. The sidewall prevents material from spilling around the cleat ends, and the cleat maintains the bed depth. For a T-type profile, a sidewall can help with fine material but may make cleaning harder.
Check the return path before adding a sidewall. A tall sidewall on a small pulley can fold, crack or contact the frame. The sidewall and cleat heights must both fit the pulley and the skirtboard.
HOLO’s QB2000S skirt and sidewall welding machine handles a maximum skirt wave height of 50 mm and a maximum skirt height of 100 mm, with a minimum loop circumference of 2000 mm. Those limits are a useful reminder that the profile design has to fit the machine and the conveyor, not just the product.
Belt Material and Welding Compatibility
PVC and PU belts are thermoplastics. A matching PVC or PU cleat can be welded with a high-frequency or hot-air process. The weld quality depends on surface preparation, temperature, pressure and cooling.
Rubber belts are not welded. Rubber cleats are vulcanized or bonded with a process specified by the belt maker. A welded PVC cleat on a rubber belt is not a mechanical joint; it is a temporary patch that will fail.
HOLO’s cleat welding machine covers 2 m and 3 m models, 5.5 kW, 220 V single phase, PVC/PU belts, belt thickness 2–10 mm and a maximum welding speed of 2 m/min. The cleat vulcanizing press uses a 1220 mm belt width, a recommended 145°C and a 0–99 minute timer for rubber work. The equipment choice follows the material, not the profile shape.
Reliable Cleat Welding Solution for Conveyor Belts Where HF Welding Is Not Applicable
LEARN MOREWhen a Custom Profile Pays Off
A custom profile is justified when the product is damaged by a standard cleat, when the material carries back, or when the incline is outside the normal range. It can also be justified when the cleat has to clear a scraper, a guide or a transfer point that cannot be changed.
Custom profiles cost more and take longer to replace. Before ordering one, test a standard profile with a short belt sample. A small change in height, pitch or sidewall often solves the problem without a new extrusion or mould.
Our finding: Buyers often choose a more aggressive profile when the real problem is discharge. A T-type cleat holds material better on the incline, then releases it poorly at the head pulley. If the product is being damaged or carried back, watch the discharge before changing the profile.
FAQ – Frequently Asked Questions
1. Which cleat profile is best for a steep incline?
For a steep incline with fine or cohesive bulk, a C-type profile with a sidewall is often the best starting point. For free-flowing bulk at 30–35°, a triangular cleat may be enough. Above 45°, test the actual material; a cleat alone may not hold the bed.
2. Can I weld any cleat profile to a PVC belt?
Only if the cleat material is compatible with the belt and the welding process. The profile shape does not guarantee weldability. Check the polymer, the plasticiser and the belt maker’s recommendation before welding.
3. Do T-type cleats need a sidewall?
Not always, but they often benefit from one with fine material. The T holds the product, while the sidewall prevents it from spilling around the ends. On a wide belt or a steep incline, the combination is more reliable than either part alone.
4. When should I choose a custom cleat profile?
Choose a custom profile when a standard shape damages the product, traps material, cannot clear the conveyor structure, or fails to hold the product at the required angle. Test a standard profile first; custom tooling is a last step, not a first choice.
Need a Cleat Profile Review?
Send us the product photo, incline angle, belt material and a video of the discharge. We will recommend a profile, height and pitch, and confirm the welding or vulcanizing method.
