Dry Bush


The bearings specially manufacture for Hydraulic gear pump application. The special resin provide high PV value for bearings and give remarkable performance under high load and high speed. Some time oil grove require at inner diameter of bearing due to high pressure fluid flow.

  • PTFE with lead 0.01~0.03mm
  • Porous bronze 0.2~0.3mm
  • Steel backing 0.7~2.3mm
  • Tin-plating 0.005mm or copper plating008mm

Bearing PropertiesUnitValue
Maximum specific load StaticN/mm²    Psi250      35500
Maximum specific load dynamicN/mm²    Psi140      20000
Maximum sliding speedm/s       fpm2.5       500
Maximum PxV factorN/mm² · m/s1.8
Maximum PxV factorN/mm² · m/s3.6
Dry coefficient of frictionµm0.02   –    0.25
Maximum temperature°C        °F+280°C  +536°F
Minimum temperature°C        °F-200°C   -328°F
Shaft finish Ra (recommended)µm0.4 Ra
Shaft hardness  (recommended)HB

Operating Conditions
DryVery good
OilVery good
Process fluidFair

Chemical Characteristics

TYPEAirVacuumWeak Acidmiddle AcidStrong AcidAlkali