Düker GmbH

Snap fit, fasten and the job is done...

It couldn’t be easier!

The unique Düker snap fit flange is a further development based on the known DIN loose flanges.

The two halves are simply clipped together without tools and can be mounted with every other conventional flange to provide a safe, reliable flange connection.

  • Proven million of times as a standard flange
  • Low-weight
  • Optimised “one-man fitting”
  • Reduced installation costs
  • No loose parts 
  • Homogenous introduction of flange forces
  • Minimised leakage rates
  • High residual torques after thermal stress


The nominal diameters from DN 25 up to DN 200 are galvanised and yellow passivated, special finishes are also possible.

Calculated, tested. Tried and proven!

Bolting torque studies and determination of leakage rate of flange connections for glass-lined pipeline components.

Even under extreme temperature stress, the Düker flange connections have unbeatable low leakage rates (between 10 -5 and 10 -6 mbar l/s). This is due to the homogenous introduction of the flange forces. The high residual torques proven in the study ensure permanent tightness even under changing temperatures.



Report on the FE tension analysis of split loose flanges DN 25, 40, 80, 100:

The FMEA (failure mode and effect analysis) revealed that none of the flanges exceeded the permissible tension limits. The loose flanges are, as a consequence, clearly sufficiently dimensioned and, as a result, have a high potential safety factor.

The results of the leakage rates and the FE tension analysis are detailed in our brochure.



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