What Is the Standard Diameter of Conveyor Rollers?

Standard diameters follow CEMA,ISO,MT,and DIN norms,with metric sizes(mm)dominant globally.Below are the most widely used standard diameters,grouped by duty:

Light‑Duty Rollers(Logistics,Packaging,Light Materials)

25 mm(1 in)

38 mm(1.5 in)

50 mm(2 in)

60 mm(2.4 in)

Standard Industrial Rollers(Most Common:Mining,Cement,Ports)

76 mm(3 in)

89 mm(3.5 in)–most widely used standard

108 mm(4.25 in)

127 mm(5 in)

Heavy‑Duty&Mining Rollers(High Load,Long Conveyors)

133 mm(5.25 in)

159 mm(6.25 in)

194 mm(7.625 in)

219 mm(8.625 in)

Key Notes

CEMA inch equivalents:3 in(76 mm),3.5 in(89 mm),4.25 in(108 mm),5.25 in(133 mm).

Selection rule:Larger diameter=higher load capacity,longer belt life,and lower noise.

Belt width matching:For belts≤800 mm,use 89/108 mm;for 1000–1400 mm,use 108/133 mm;for≥1600 mm,use 159/194 mm.

GB/T 7714：

Loutridis M,Psomopoulos C,Tzounis L.Identification of idler failures in belt conveyor systems based on vibration signal analysis[J].Engineering Failure Analysis,2021,128:105384.DOI:10.1016/j.engfailanal.2021.105384.

APA：

Loutridis,M.,Psomopoulos,C.,&Tzounis,L.(2021).Identification of idler failures in belt conveyor systems based on vibration signal analysis.Engineering Failure Analysis,128,105384.https://doi.org/10.1016/j.engfailanal.2021.105384

MLA：

Loutridis,M.,C.Psomopoulos,and L.Tzounis.“Identification of Idler Failures in Belt Conveyor Systems Based on Vibration Signal Analysis.”Engineering Failure Analysis,vol.128,2021,p.105384,doi:10.1016/j.engfailanal.2021.105384.