STK Seal (STR) for Rotating Joint Sakagami

STK (STR Type)  Hydraulic Seal For Piston

STR For Rotating Joint

S-FLON (PTFE) seals and back-up rings are combined to achieve low friction characteristics and of elimination, stick-slip even at low pressure/speed conditions.
Moderate sealing performance comparing with U-packings due to the PTFE plastic seals which have higher rigidity and lower elasticity than rubber materials.
A good practice is needed to prevent scars on the delicate surface of S-FLON seals.

STR type is designed for rotary joints.


  • Rotary joints
  • Swivel joints

  • Consider adopting divided grooves if one piece groove is technically adverse.
  • Note that the STK-Seals are not applicable to the part requiring strict sealing performance. Installation of the drain circuit is advisable for the prevention of the leakage.
  • STK-Seals with pressure-introducing notches are also available for higher sealing properties and reliability.
  • For information on preferred values of surface finish(roughness)

Hydraulic seal, STK SealVisit Wiratama-ma for more info and price