O-ring 6x0,8mm

A cross-section of 0.8mm is one of the thinner cross-sections used in service o-rings. Such a small dimension means that o-ring 40177 operates in a tight, precision seat – the tolerance margins for dimension and seat condition are significantly smaller here than with thicker seals.

Application

O-ring 40177 is used in Kranzle pressure washers at locations requiring a seal with an internal diameter of 6mm and a cross-section of 0.8mm. The small dimensions indicate a seat in a precision connector, valve, or connection point – the exact installation position depends on the washer model and the serviced assembly. The 6x0.8mm dimension denotes: internal diameter 6mm, cross-section thickness 0.8mm.

Symptoms – When to Replace

• Leakage at the o-ring seat – water seepage under normal operating pressure.
• O-ring damaged or cut during disassembly – the thin 0.8mm cross-section is susceptible to damage from disassembly tools.
• Hardening or permanent deformation of the seal after extended use.
• Leakage persisting despite correct connection tightening – the o-ring no longer fills the seat evenly.
• Preventive replacement during assembly disassembly – an o-ring with such a small cross-section is worth replacing every time the seat is opened.

How to Select the Correct Part

With such small dimensions, both parameters – internal diameter 6mm and cross-section 0.8mm – must match the seat exactly. An o-ring with a 1mm cross-section will not fit the tight seat or will be excessively compressed. An o-ring with a 0.6mm cross-section will not fill the seat and will not provide a seal. Reference number 40177 is the most reliable basis for ordering the correct variant. If the number is unavailable, measure the removed o-ring with a calliper – at such small dimensions, a 0.2mm difference in cross-section is already significant.

Compatibility

Kranzle catalogue part. Used among others in Kranzle pressure washers requiring a 6x0.8mm seal. The exact installation position depends on the model and the serviced assembly.

[faq]

How to safely remove a 6x0.8mm o-ring from the seat without causing damage?|With a 0.8mm cross-section, any tool with a sharp edge – a steel pick, chisel, or flat-bladed screwdriver – can easily cut the seal or scratch the seat. Tools with a rounded tip made from plastic or brass are safer. If the o-ring is firmly seated, it can be softened with warm air before removal. When disassembling the assembly it is advisable to fit a new o-ring regardless – the cost of the seal is negligible compared to the risk of damaging the seat.

Is a 6x1mm o-ring a close enough substitute in an emergency service situation?|No. A 0.2mm difference in cross-section for a seat designed for 0.8mm is a relatively large deviation – a 6x1mm o-ring will be excessively compressed, which will hinder or prevent the connector from closing and will shorten seal service life. At such small dimensions there is no safe tolerance range between adjacent catalogue sizes.

What does it mean that the seat is "too large" for a 0.8mm o-ring, and how to recognise it?|A worn seat has a depth or width greater than the design value. A 0.8mm o-ring in an excessively deep seat sits below the contact surface and is not compressed when the connector is closed – the result is leakage despite a new seal. After disassembly, check visually and by touch whether the seat edges are sharp and regular, with no pitting or corrosion marks on the base and walls.

Does the connection require a running-in period after replacing o-ring 40177, or does the seal work immediately?|An o-ring correctly seated and with the connector closed seals from the first start-up. If leakage persists after installation under normal pressure, there is no point waiting for a "running-in" period – this is a signal of incorrect seating, a twisted o-ring, or a damaged seat that must be inspected before restarting.

 [/faq]