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Ribbed Belts – Procedure for Belt Identification

Step 2 - What is the belt profile and number of ribs?

Ribbed belts have lengthwise grooves on the inside.
Measure the pitch of the groove, i.e. distance between projections, e.g. 3.54 mm = belt type PK.
Count the number of grooves, i.e. the number of projections - e.g. 7, as shown in the picture.
Width measurement is not usually accurate and is used only to check.
Belt width = groove pitch x number of grooves.

Profile can be found in the e-shop.

Step 3 - What is the belt length?

Measure the length of the belt, e.g. encircle the outer surface with a string.
Then measure the length of the string.

Belt lengths

  • inner length Li - measured by the inside surface
  • outer length La - measured by the outside surface
  • working length Lw - working length

Belt designation:

E.g. ribbed belt 6 PK 950
  • 6 ... number of grooves
  • PK ... groove profile (indicates groove pitch)
  • 950 .... length in mm

More tips for identifying belts

Newer belts have markings, identifying product number and manufacturer.

In case of repeated belt damage or breakage, it is necessary to remove the belt and determine its fault.

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