Rod seal, single-acting, Type SD 04

This single-acting rod seal type SD 04 is a two-piece seal. It consists of a profile ring and an O-ring as a preload element and is thus ideally suited for applications in the low pressure range.

A low coefficient of friction and small installation height are the decisive advantages of this seal. It is also characterized by a high wear resistance, good service life and very good chemical and thermal resistance.

While the PTFE profile ring seals dynamically against the cylinder surface, the elastic O-ring ensures uniform contact pressure of the PTFE profile ring onto the cylinder surface, and at the same time, a static sealing between profile ring and groove base.

Even with low pressures, the piston seal shows a good sealing effect thanks to the inherent preload of the PTFE profile ring and the contact force of the preloaded O-ring. At higher system pressures, the medium pressurizes the O-ring causing it to press the PTFE seal with enhanced force against the cylinder surface.

With different material combinations, the piston seal can be used reliably across the whole pressure, speed and temperature range.

Application media

  • Mineral oil-based hydraulic liquids
  • Water
  • Air
  • Environment-friendly bio-oils
  • Flame-resistant hydraulic liquids
  • Other media, depending on the O-ring material

Application range

Pressure: up to 16 Mpa (160 bar)

Speed: approx. up to 2 m/s

Temperature: -30°C to +100°C (depending on the O-ring material)

Surface finish

Roughness depthRaRt
Running surface≤ 0,3 µm≤ 2,5 µm
Groove base≤ 1,6 µm≤ 6,3 µm
Groove flank≤ 3,0 µm≤ 15,0 µm

Installation dimensions

Rods ø D
overtoGroove base ø DGroove width L+0,2
922ø d + 6,23,2
2255ø d + 7,24,0
55150ø d + 12,27,5

PTFE profile ring material

For other possible materials see our overview of PTFE materials in the technical information section.

PTFE + bronze

The standard for hydraulic applications, good gliding behavior, particularly pressure and abrasion resistant, cannot be used in aqueous solutions or acids

O-ring material

Nitrile rubber NBR: Temperature range − 30 °C to + 100 °C

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