Brands - SAI


SAI Hydraulics

Founded in Italy in 1964, the core business of SAI hydraulics continues to be the production of crankshaft design SAI hydraulics radial piston motors.

Available in an extensive range of displacements from 40 cc/rev through to 1200 cc/rev and in nine basic frame sizes, options include variations on shafts, flanges, bearings, distributors, high pressure shaft seals, and competitor interchangeability.

SAI’s radial piston motor design differs to others due to its: swivelling cylinder, piston retaining ring, axial rotary valve and interchangeable distributors. Other features of SAI radial piston motors include:

  • Swivelling cylinder – enabling the cylinder to remain aligned with the eccentric of the crankshaft, thus eliminating any side loading between the piston and cylinder;
  • Double piston support bearing – the pistons transmit their load to the shaft via a hydrostatic bearing which reduces metal to metal contact, and a central roller bearing which minimises the sliding velocity between piston and the spherical support ring;
  • Piston retaining rings – ensuring that the piston remains in contact with the shaft under all operating conditions, including in cavitation;
  • Axial flow rotary distributor – ensuring that the oil is distributed to the pistons with high efficiency due to short, large section oil paths. Many different distributor options can be fitted to any of the range of SAI hydraulics motors.
The SAI hydraulics range includes: 
      SAI GS Series Radial Piston Motor SAI P Series Radial Piston Motor SAI TF Series Radial Piston Motor   SAI TV Series Radial Piston Motor

This website only showcases a sample of the products that we supply, so don't worry if you can't find the SAI hydraulics and motors that you're looking for - we'll still be able to help. Contact us now using our online enquiry form or online chat, or you can reach us via: or on +44 (0) 845 644 3640.

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