Karlsson Spools

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Karlsson Spools AB is a Swedish-based manufacturer of spools for hydraulic valves that are used in hydraulic machinery. More specifically, the spools are part of directional control valves where the spool slides inside a housing to route hydraulic fluid to mechanical components. Some examples of equipment that use hydraulic machinery are: Excavators, forklifts and machinery used for logging.

The company manufactures spools in sizes ranging between 25-400 mm (1”-16”) length and diameters between 5-50 mm (.120”-2”). Tolerances of + 0.00075 mm (.000030”) can be obtained. The production line includes a range of steps including CNC turning, milling machines, coining, deburring, induction heat treatment and plating. However the tolerances are achieved mainly by means of high-precision grinding machines. ^[1]

Karlsson Spools produces approximately 4 million spools per year to customers in Europe, the USA, Asia and South America. The company is located in Sala, Sweden and Kunshan, China ^[2] with a distribution centre in Indiana, USA. ^[3] ^[4]