with groove on outside diameter, for rod application. split and non split design avail- able.

guide ring type BWR 08 is mainly used on piston rods. it provides guiding and bearing surfaces between rod and housing and prevents metal to metal contact between them.

the BWR 08  consists of an extremely abrasion-resistant and low-friction POM-PTFE Bronze compound & other material. it can be used for hydraulic oil with a mineral oil base, for water-oil emulsions and for fire-resistant fluids as well as compressed air.

it has a U-shaped cross-section and is split with an angled butt joint. it can be spirally compressed inwards for fitting into the rod housing where it springs back out into corresponding installation grooves. the bearing groove arrangement secures it against axial movement.


not bolded symbols; please consult our technical for application limitations

category of profile

machined product only.

operating parameters & material

material temperature max. surface speed max. specific load
POM -50 °C … +100 °C 4,0 m/s 25 N/mm2
PA -40 °C … +100 °C 4,0 m/s 25 N/mm2
PTFE glass -200 °C … +200 °C 4,0 m/s 3 N/mm2
 PTFE bronze -200 °C … +200 °C 5,0 m/s 4,5 N/mm2
Phenolic Resin -40 °C … +130 °C 1,0 m/s 90 N/mm2

the stated operation conditions represent general indications. it is recommended not to use all maximum values simultaneously. surface speed limits apply only to the presence of adequate lubrication film.

2 POM up to ø260 mm, PA above ø260 mm

tolerance recommendation

seal housing tolerances
Ød h10
Ød1 h8

surface quality

surface roughness

Rtmax (μm)

Ra (μm)

sliding surface ≤1,5 0,3 – 0,5
bottom of groove ≤6,3 0.8
groove face ≤15 ≤3.2

fitting & installation

the split guide ring F08 is compressed spirally and can be snapped easily into corresponding grooves in the cylinder head.

seal & housing recommendations

please note that we are able to produce those profiles to your specific need or any non standard housing. for detail measurements, please see Jet seal pars catalog…

don’t hesitate to contact our technical department for further information or for special requirements (temperature, speed etc.), so that suitable materi- als and/or designs can be recommended.