When the application requires a direct and solid shaft connection and that shaft misalignments during operation are minimal, then the solid or rigid type couplings can be used. We offer a number of rigid coupling designs.
Type HR rigid coupling
Two distinct designs are available. The one and two piece HR series couplers have superior holding power and maintain alignment. The single piece versions are supplied with four clamping screws. The two piece split version couplers can be installed and removed without machine dis-assembly. Supplied with eight clamping screws, they provide reliable holding power and maintain alignment. The HR series suits shaft sizes from 6mm up to 50mm in diameter.
Split clamp design HR1
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Two part clamp HR2

Table of available sizes
| One Piece HR1 | Two Piece HR2 | Bore A (mm) | Bore B (mm) | OD (mm) | Length L (mm) | Clamp Screw type | Available in Stainless Steel and Steel |
| HR166* | HR266* | 6 | 6 | 18 | 30 | M3x8 | Yes |
| HR188* | HR288* | 8 | 8 | 24 | 35 | M3x10 | Yes |
| HR11010* | HR21010* | 10 | 10 | 29 | 45 | M4x12 | Yes |
| HR11212* | HR21212* | 12 | 12 | 29 | 45 | M4x12 | Yes |
| HR11414* | HR21414* | 14 | 14 | 34 | 50 | M5x16 | Yes |
| HR11515* | HR21515* | 15 | 15 | 34 | 50 | M5x16 | Yes |
| HR11616* | HR21616* | 16 | 16 | 35 | 50 | M5x16 | Yes |
| HR12020* | HR22020* | 20 | 20 | 42 | 65 | M6x16 | Yes |
| HR12525* | HR22525* | 25 | 25 | 45 | 75 | M6x16 | Yes |
| HR13030* | HR23030* | 30 | 30 | 53 | 83 | M6x18 | Yes |
| HR13535* | HR23535* | 35 | 35 | 67 | 95 | M8x25 | Yes |
| HR14040* | HR24040* | 40 | 40 | 77 | 108 | M6x16 | Yes |
| HR15050* | HR25050* | 50 | 50 | 85 | 124 | M10x25 | Yes |
* State which material when ordering
* Other bore sizes on request
Precision Solid Couplings

Rigid couplings are available as standard in aluminium alloy, steel and stainless steel. For smaller shaft sizes the new SC series clamping method that ensures the concentricity of the clamped shaft. Suited to shaft sizes from 5mm to 12mm, including imperial and custom formats, make the new SC series ideal for applications where high torque and exceptional torsional stiffness are required.
Industrial ribbed compression

The ribbed-type compression couplings are recommended for emergency and regular service on heavily loaded shafts. These couplings are bored true to shaft size, and the halves are separated during the boring operation to allow for clamping when the halves are drawn together. The bolt heads and nuts are protected by flanges and the end flanges are always faced square to bore. Ideally suit bore sizes of 30mm to 120mm.
If you require further technical information, please do not hesitate to contact our sales engineers who will be more than happy to help you with your selection. Alternatively download the relevant rotary catalogue from the download button on this page or use the following link to request a printed catalogue or a CD version. CD/Catalogue