As a standard, all male tips and female bodies from the QRC-FF, QRC-HP, QRC-HS and QRC-RH series are supplied with grooves in easily visible locations on external parts. The customer/user can insert rings into these grooves for color marking the couplings.

The rings are manufactured from thermoplastic polyurethane (TPU). TPU is a lightweight, elastic material with very good abrasion and wear resistance, paired with high resilience.

No, the integrity of the coupling is not affected. The grooves for the color marking rings are placed in non-critical areas on external parts, such as the sliding sleeve.

Extensive finite-element-method (FEM) simulations during the development phase and additional burst and pressure tests at the STAUFF Technology Center delivered the clear conclusion that the grooves have no impact on performance and that the quick release couplings continue to meet or exceed the usual high requirements.

The rings for color marking the couplings can be installed by the customer/user as required.

No, this is currently not planned due to the large number of possible combinations.

No special tools are required. Simple hook tools can make installation easier, though. The development focused especially on a user-friendly solution. If necessary, the rings can also be expanded manually and pushed into the corresponding position.

Yes, if the coupling has the required grooves, then the marking rings can be installed at any time.

Generally, yes. We do not recommend re-using damaged (e.g. cracked) rings, though.

In that case, simply omit the color marking rings and use the couplings without color marking as before.

STAUFF offers the color marking rings in the following standard colours:

• Red (RAL 3000)
• Black (RAL 9005)
• Yellow (RAL 1018)
• Blue (RAL 5005)
• Green (RAL 6002)
• Orange (RAL 2011)
• Purple (RAL 4001)
• Grey (RAL 7000)

Small color deviations may be caused by the production process.

Other colors can also be supplied, depending on the required quantities.

Please contact a STAUFF sales representative for an individual offer.

No, when using a dust cover for female bodies, the color marking must be done via the marking clips. The male tip must be fitted with a color marking ring.

Yes, this is also possible. Half-width rings can be used to create a large number of different color combinations. Accordingly, two rings are
required.

Please contact STAUFF for an individual offer.

It may happen that one connection is used for several lines. In this way, the dual function of the connection can be color-coded and it becomes clear to the user that he can theoretically connect both lines.

The rings are subject to the same requirements as many other plastic and elastomer products.

With correct storage, the color marking rings can be stored for up to 10 years. Correct storage means that the rings are not continuously exposed to external environmental influences.

The rings should be stored in a dry, draught-free location at constant temperatures below 77 °F and protected against ozone and strong artificial light. Failure to comply with these recommendations can cause the rings to become brittle.

No. Selecting the right material was one of the crucial criteria for the development of the color marking rings.

Resistance to all media generally used in hydraulic systems was therefore of great importance. In addition to this, the ring material is also resistant to other oils, greases and a number of common solvents.

If you are unsure about the resistance of the rings to specific media or if you have any questions, please contact STAUFF for more information.

The thermoplastic polyurethane (TPU) used is thermally stable and also features excellent UV resistance.