Rectangular expansion joints

Rectangular expansion joints are single-walled metal expansion joints in single or multi-shaft variations with lower expansion in very robust construction. Rectangular expansion joints can be manufactured with round or pointed corners.

HKS triple-convolution rectangular lens expansion joint, with flanges at both ends
Rectangular lens expansion joint flanges by HKS
Rectangular expansion joint parameters

Bellows materials

  • C steel (S235JR)
  • elevated temperature steels (P265GH, 16Mo3, 13 CrMo 44, etc.)
  • high-alloyed steel (1.4401, 1.4541, 1.4571, 1.4828, etc.)
  • various Ni alloys (2.4856, 2.4858, etc)

Connection parts

  • without additional connection parts
  • Weld ends
  • Fixed flanges


  • Fluids
  • Gases
  • abrasive media
  • Solids

Nominal widths

  • any size

Operating temperature

  • up to 1000°C

Pressure levels

  • PN1 to PN2,5

Construction shapes

  • rectangular

Inner protection tube

  • Variations with or
  • without inner guide tube and/or
  • Guide tube possible

Movement absorption

  • axial
  • lateral
  • angular
  • Combinations thereof