Torsion Stiff Metal Bellow Couplings

ALMA metal bellow couplings connect shafts absolutely torsion stiff, by balancing their misalignment in lateral, angular and axial direction. In circumferential direction they operate like a rigid element, this way they can transfer drag torques absolutely torsion stiff.

High stability of welding connection
ALMA couplings of ATM and AEKN types are generally welded together at clamping hubs and metal bellow. Therefore the connection has a high resistance against acids or other aggressive media.

Corrosion-free stainless steel version
ALMA couplings made of stainless steel are corrosion-free and therefore ideal for operating conditions with aggressive media and vacuum or clean room applications. Because of their high operating temperature rating of up to 300 °C they are ideal for high demands in chemical, food and vacuum applications.
Direct link to GETECNO, our distributor for Germany and Italy, who sells our metal bellow couplings under the brand RODOFLEX®. GETECNO offers you comprehensive storage services and quick deliveries.
Direct link GETECNO

Miniature Metal Bellow Couplings


The miniature couplings type AMK and AMKN balance misalignments of rotating shafts and ensure an absolute synchronized transfer of rotating movements. They feature a low angular momentum and high torsion stiffness. They are applicable for nominal torques of 0,25 Nm - 12 Nm for shaft diameters of 1 mm - 24 mm.
Benefits at a Glance
  • Low angular momentum
  • Balancing of misalignments
  • Temperature range up to 80°C
  • Compact Design
  • Free of wear and play
  • Easy Mounting and Demounting

Torsion stiff Metal Bellow Couplings


ALMA Metal Bellow Couplings type ATM feature a welded bonding. This ensures higher temperature resistance and higher mechanical strength. Clamping types are conical clamp connections, radial or axial clamping hubs, etc. ALMA Metal Bellow Couplings are applicable for nominal torques of 10 Nm - 320 Nm for shaft diameters of 8 mm - 60 mm.
Benefits at a Glance
  • Low angular momentum
  • High torsion stiffness
  • Balancing of misalignments
  • Temperature range up to 300°C
  • Variable clamping possibilities
  • Torque transfer exact and free of play
  • Easy Mounting and Demounting

Torsion Stiff Metal Bellow Couplings Product Overview

 Type BenefitsClamping,
connection hub-bellow
MaterialTransferable torques
and deliverable sizes
AMK Miniature type for low torques Radial threaded pin, adhesive bonding Hubs: AlCuMgPb,
Bellows: CuZn20
0,25-12,0 Nm
D1/D2 1-24 mm
AMKN Miniature type for low torques Radial clamping hubs, adhesive bonding Hubs: AlCuMgPb,
Bellows: CuZn20
0,4-12,0 Nm
D1/D2 3-20 mm
AEKN Miniature type for applications in vacuum or aggressive media Radial clamping hubs, weldment Hubs: 1.4305,
Bellows: 1.4571
1,8-10,0 Nm
D1/D2 3-14 mm
ATMK For applications in vacuum or aggressive media, for high torques Hubs: radial weldment Hubs: 1.4305,
Bellows: 1.4571
10,0-320,0 Nm
D1/D2 8-60 mm
ATMN For high torques and axial clamping Conical clamp connection, axial clamping, weldment Hubs: 1.4305,
Bellows: 1.4571,
Socket: 42CrMoS4
10,0-320,0 Nm
D1/D2 8-41 mm
ATMF For applications in vacuum or aggressive media, for high torques and axial clamping Axial clamping, fitting flange Hubs: 1.4305,
Bellows: 1.4571
10,0 - 320,0 Nm
D1/D2 25-50 mm
ATMB For applications in vacuum or aggressive media, for high torques Radial clamping, Fit-in-key Hubs: 1.4305,
Bellows: 1.4571
20,0 - 320,0 Nm
D1/D2 10-42 mm
AKS Rigid type Radial clamping, threaded pin AlCuMgPb D1/D2 2-12 mm