These rollers are divided into three classes:
  • 1st class rollers with a flat ground head
  • 2nd class rollers with a flat ground head
  • 2nd class rollers with a flat non-ground head

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Most Common Sizes of Cylindrical Rollers
D x L (mm) D x L (mm) D x L (mm) D x L (mm)
2.5x5 6x8 8x8 13x20
3x4 6x10 8x10 14x14
3x5 6x12 8x12 14x20
4x4 6x15 8x14 15x15
4x5 6x17.8 8x16 15x22
4x6 6x18 8x20 16x16
4x8 6x21.8 9x9 16x24
4x10 6x24 9x14 17x17
4x12 6.5x6.5 10x10 18x18
5x5 6.5x9 10x14 18x16
5x8 7x7 11x11 19x19
5x10 7x12 11x15 20x20
5x12 7x14 12x12 20x30
5x15 7x18 12x18 22x34
6x6 7.5x7.5 13x13
Tolerances - 1st Class Rollers with a Flat Ground Head
Diameter
Diameter (mm) D Tolerance D Selection Groups Max Roundness Error Max Orthogonality Max Roughness
from 2.5 to 26 +5-10µ 0.8µ 0.1µ Ra
from 26 to 50 +5-10µ 3 or 4µ 1.2µ 10µ 0.15µ Ra
Length
From 3mm to 15mm : 0 - 30µ (it is also possible to supply the lengths classified in groups of 6ยต).
From 15mm to 50mm : 0-50µ

The first class rollers can have enhanced variants such as:
  • diameter selection in groups of 1µ
  • super finish of the diameter to reduce surface roughness to a value of Ra=0.04 and circularity value within 0.5µ
  • controlled contour "ZB" profile, that is with the roller generating lines suitably shaped towards the extremities so as to allow a better distribution of loads in the case of rollers subjected to heavy stresses
Tolerances - 2md Class Rollers with a Flat Ground Head
Diameter
Diameter (mm) D Tolerance D Selection Groups Max Roundness Error Max Orthogonality Max Roughness
from 2.5 to 50 +5-10µ 1.5µ 1-µ 0.15µ Ra
Length
From 3mm to 15mm : 0 - 30µ
From 15mm to 50mm : 0-50µ
Tolerances - 2md Class Rollers with a Flat Non-Ground Head
Diameter
Diameter (mm) D Tolerance D Selection Groups Roundness Max Roughness
from 3 to 12 +5-10µ in 5 ex 10µ 0.2µ Ra
Length
From 3mm to 50mm : 0-200µ