Rod guide ring, Type SF

The rod guide ring type SF prevents metal parts from contacting each other and additionally absorbs occurring shear forces. As standard it is made of the compound PTFE + carbon or PTFE + bronze. However, other materials are also available.

Given its good media resistance, the rod guide ring can be used in several media ranging from mineral oil-based hydraulic liquids, environment-friendly hydraulic liquids and water-oil emulsions to flame-resistant hydraulic liquids.

Rod guide rings offer high temperature and media resistance and a low static pressure resistance; furthermore they show excellent gliding behavior, good emergency running properties and also a high wear resistance.

Application media

Mineral oil-based hydraulic liquids
Water-oil emulsions
Environment-friendly hydraulic liquids
Flame-resistant hydraulic liquids

Application range

Pressure resistance: max. 15 N/mm² at 25°C

Pressure resistance: max. 12 N/mm² at 80°C

Temperature: max. 8 N/mm² at 120°C, up to 15 m/s, – 30 °C to +200 °C

Surface finish

Roughness depth	Ra	Rt
Running surface	≤ 0,3 µm	≤ 3,0 µm
Groove base	≤ 1,6 µm	≤ 16,0 µm
Groove flank	≤ 1,6 µm	≤ 16,0 µm

Installation dimensions

Rods ø D	Gap Z	Gap size S	Radius R max.
< 40,0	1,0 – 3,0	0,25 – 0,4	0,2 für ø D ≤ 250,0 0,4 für ø D ≤ 250,0
< 80,0	3,0 – 6,0	0,25 – 0,5
< 140,0	5,0 – 10,0	0,3 – 0,6
< 340,0	7,0 – 14,0	0,4 – 0,6

PTFE profile ring material

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

PTFE + bronze

Used preferably for hard counter running surfaces; is a standard material in hydraulics

PTFE + carbon/graphite

Used with softer counter running surfaces such as stainless steels, aluminum and bronze, also preferably where the media water and steam play a role.

Downloads

Materials overview for dynamic seals (PDF)Product data sheet for the Rod guide ring, Type SF (PDF)

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