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Welded On Profiles and Flights Specs

Welded On Profiles and Flights Specs

Profiles and Flights tolerances

The standard pitch to pitch tolerance between profiles is +/-0.5mm. Standard height tolerance is +/- 0.5mm. Improved tolerances available, subject to tooling being available.

Profile thickness ‘s’

The belt flexibility can be affected by the profiles or flights if a fairly thick profile is selected. As a rule, the profile or flight thickness‘s’ should be as small as possible to perform the required task (the shear strength of a profile or flight is approximately 160 N/cm ). The following table illustrates the relationship between the chosen pulley size and the maximum corresponding profile or flight thickness‘s’. If the maximum thickness‘s’ is exceeded, there is a danger of cracking, as shown in the diagram (Fig.1- right).

Pitch Profile/Flight width (mm)
Number of teeth in pulley 20 25 30 40 50 60 100
Position type 1 2 1 2 1 2 1 2 1 2 1 2 1 2
T5 5 2 6 2 6 3 8 4 9 6 10 8 12 10
T10 8 3 9 4 10 4 12 6 14 9 15 12 20 20
T20 12 5 13 5 15 6 18 8 20 12 23 20 30 30
AT3 5 2 5 2 6 3 6 3 8 4 9 6 10 8
AT5 5 2 6 2 6 3 8 4 9 6 10 8 12 10
AT10/ATP10/ BAT 10/SFAT 10 8 3 9 4 10 4 12 6 14 9 15 12 20 20
AT20/SFAT 15/SFAT20 12 5 13 5 15 6 18 6 20 12 23 20 30 30
XL 5 2 6 2 6 3 8 4 9 6 10 8 12 10
L 6 3 7 3 8 4 10 5 12 7 13 10 16 16
H 8 4 9 5 10 6 12 7 14 10 15 12 20 20
XH 13 5 14 5 15 6 18 8 20 12 23 20 30 30

Profile thickness example

Determining the profile or flight thickness‘s’ on a T10 BRECO® belt running around a 20 tooth pulley:

  • For profiles or flights positioned over the tooth form, profile or flight thickness‘s’ <=8mm
  • For profiles or flights positioned over the tooth gap, profile or flight thickness‘s’ <=3mm
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