SMJ Hydraulic Seal Sakagami 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.
SMJ type is available as rod seals with optimum sealing performance and durability.
SMJ Hydraulic Seal Sakagami Applications
- Cylinders for general industrial machines.
- Cylinders for construction equipment.
- Cylinders for special applications.
Sealing System Application

ST Hydraulic Seal -Hydraulic packings for pistons(Installable in one-piece groove)
S-FLON (PTFE) seals and back-up rings are combined to achieve low friction characteristic 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.
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A good practice is needed to prevent scars on the delicate surface of S-FLON seals.
- ST type is applicable to common & general applications with diversified dimensions.
- STS type is designed for low friction/pressure cylinders, with the small cross-sectional areas.
- STG type is well accepted by construction machines and heavy machinery sectors.
Application
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- Cylinders for machine tools.
- Industrial vehicles.
ST Hydraulic Seal Sakagami For Pistons Drawing
SMJ Hydraulic Seal Sakagami Note :
- Consider adopting divided grooves if one piece groove is technically adverse.
- For applications without wear rings, set the φD2 side diameter to φD H9/f8.
- Install wear rings for φ20 and φ25 together with SWA-Wear rings.
- ST-Seals with the pressure-introducing notches are also available for the higher sealing effectiveness and reliability.
- For information on preferred values of surface finish (roughness).

Hydraulic seal, SMJ Seal