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BS ISO 9982:2021
Belt drives. Pulleys and V-ribbed belts for industrial applications. PH, PJ, PK, PL and PM profiles: dimensions (British Standard)
This document specifies the principal dimensional characteristics of V-ribbed pulley groove profiles, together with the corresponding endless V-ribbed belts, of PH, PJ, PK, PL and PM profiles which are used for general industrial applications except elastic belts.
The PK belt was originally established for automotive accessory drive applications and ISO 9981 deals specifically with that particular field.
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British Standards Institution [bsi]