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ENGINEERING TOOLS

PULLEY DIAMETER CALCULATOR

Minimum drum diameters per DIN 22101

Compute the minimum recommended drive, bend, and snub pulley diameters for any standard fabric (EP) or steel-cord (ST) conveyor belt class. Returns a complete 3×3 matrix across DIN 22101 utilization groups so you can see all valid drum sizes for your belt at a glance.

Belt type
Base diameter (Drive A · Group I)1000 mm · 39.4 in
Minimum drum diameters
 Drive (A)Bend (B)Snub / tail (C)
Group I
60–100 % of rated tension
1000 mm
39.4 in
800 mm
31.5 in
630 mm
24.8 in
Group II
30–60 % utilization
800 mm
31.5 in
640 mm
25.2 in
504 mm
19.8 in
Group III
Below 30 % utilization
650 mm
25.6 in
520 mm
20.5 in
410 mm
16.1 in
Method
  • D_A = base diameter from belt class table (Drive · Group I)
  • Group factor: I = 1.00, II = 0.80, III = 0.65
  • Function factor: A = 1.00, B = 0.80, C = 0.63
  • D_min = D_A · group_factor · function_factor

Need a verified pulley diameter selection for your conveyor?

Talk to an engineer

How drum diameter selection works

DIN 22101 specifies the minimum drum diameter as a function of the belt's tension class and how heavily it is loaded. A belt running close to its rated breaking strength sees more bending stress on small drums, so the standard mandates larger drums to keep carcass stress below fatigue limits.

Three drum types are distinguished by their function: drive drums (A) carry the full motor torque and see the highest belt tensions; bend drums (B) deflect the belt around the conveyor profile but carry only the static tension; snub drums (C) increase wrap on a drive but see almost no tension. Each step down (A → B → C) allows a smaller minimum diameter.

Three utilization groups (I, II, III) discount the diameter further for belts running below their rated capacity. A 65 % discount (Group III, lightly loaded) is typical for short, low-incline belts that rarely see peak tension. After computing the minimum, round up to the nearest preferred size: 250, 315, 400, 500, 630, 800, 1000, 1250, 1400, 1600, 1800, 2000 mm.

Belt class quick reference

Base drive drum diameter (Group I, drum function A) per DIN 22102 / 22131. The output matrix above derives all other drum types from these base values.

Fabric (EP) belts — DIN 22102

Belt classBreaking strengthBase D (Drive A · Group I)
EP 100/2100 N/mm250 mm
EP 160/3160 N/mm315 mm
EP 200/3200 N/mm400 mm
EP 250/4250 N/mm400 mm
EP 315/4315 N/mm500 mm
EP 400/4400 N/mm630 mm
EP 500/4500 N/mm800 mm
EP 500/5500 N/mm800 mm
EP 630/4630 N/mm1000 mm
EP 630/5630 N/mm1000 mm
EP 800/5800 N/mm1250 mm
EP 1000/51000 N/mm1400 mm
EP 1250/51250 N/mm1600 mm
EP 1600/51600 N/mm2000 mm
EP 2000/52000 N/mm2200 mm

Steel cord (ST) belts — DIN 22131

Belt classBreaking strengthBase D (Drive A · Group I)
ST 500500 N/mm630 mm
ST 630630 N/mm800 mm
ST 800800 N/mm800 mm
ST 10001000 N/mm1000 mm
ST 12501250 N/mm1000 mm
ST 16001600 N/mm1250 mm
ST 20002000 N/mm1250 mm
ST 25002500 N/mm1400 mm
ST 31503150 N/mm1400 mm
ST 40004000 N/mm1600 mm
ST 50005000 N/mm1800 mm
ST 63006300 N/mm2000 mm

Common pitfalls

  • Picking drum diameter only from the belt class table without checking utilization. A fully loaded EP 1000/5 needs 1400 mm; the same belt at 30 % load only needs ~910 mm.
  • Specifying a snub drum at the same diameter as the drive drum. This wastes structural steel and adds inertia at start-up. Use Type C dimensions for the snub.
  • Ignoring belt thickness when sizing very small drums for thin / lightly loaded belts. Always check actual carcass + cover thickness against the bending radius.
  • Forgetting that the diameter standard refers to the bare drum face. Add the lagging thickness (typically 10–15 mm rubber, 12–15 mm ceramic) when ordering.
  • Using DIN values for cold-rated service. Below 0 °C, increase the minimum by one diameter step (or consult the belt maker).

When to consult an engineer

DIN 22101 covers conventional steady-state conveyors. For high-tension belts (ST 5000+), elevated-temperature service, low-temperature service, dynamic start-up loads, or any belt requiring DIN 22101-2 dynamic verification, talk to a BisonConvey engineer for a verified drum specification.

Get a drum specification

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