Most U.S. aftermarket manufacturers use an English measurement system, where the length is expressed in tenths of an inch, but the worldwide industry standard is based on a metric measurement. This metric numbering is sometimes referred to as a “PK” number, and is found on most belts along with the manufacturer’s traditional part number.

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A serpentine belt (or drive belt[1]) is a single, continuous belt used to drive multiple peripheral devices in an automotive engine, such as an alternator, power steering pump, water pump, air conditioning compressor, air pump, etc.[2] The belt may also be guided by an idler pulley and/or a belt tensioner (which may be spring-loaded, hydraulic, or manual).To allow the belt to pass over more than three pulleys with a large enough wrap angle to avoid slipping, idler pulleys which press against the back of the belt are included, forcing the belt into a serpentine shape. To accommodate this bidirectional flexing while remaining strong enough to transfer the total force required by multiple loads, a serpentine belt is almost always of multi-groove (multi-vee, poly-v, or multi-rib) construction.