Ruland Backlash Free Jaw Couplings

Backlash-free, or zero-backlash jaw couplings, comprise two hubs and an insert called the spider. Selecting the right spider is critical to the coupling performance in your application. Ruland offers three choices of spiders with differing performance characteristics based on their shore hardness. They are conveniently colour-coded for easy identification without needing additional testing.

• 98 Shore A (red) – highest torque and torsional stiffness
• 92 Shore A (yellow) – balance of torque, torsional stiffness, and dampening
• 85 Shore A (blue) – high dampening with limited torque and stiffness capabilities

This handy chart from Ruland compares the features of their jaw-coupling spiders

Ruland backlash-free jaw couplings feature a three-part design. This comprises two metal hubs along with an elastomeric spider insert. Should this spider fail, the metal hubs lock together to allow operation to continue until the spider is replaced. This helps to keep downtime to a minimum.

Thanks to its polyurethane spider element, this coupling offers outstanding levels of protection against vibration whilst reducing the impact of shock loads. This helps to protect sensitive surrounding equipment, such as the motor, from damage, extending its lifespan.

Ruland backlash-free jaw couplings require minimal maintenance, as lubrication is not required. They are also quick and easy to fit, inspect and replace when required. This ensures that downtime is kept to a minimum, maximising your productivity.

This coupling is suitable for many applications thanks to the vast selection of options available. Clamp and set screw hubs can be combined with inch, metric, keyed and keyless bores for maximum versatility. The backlash-free design of this coupling makes it suitable for servo and encoder applications which require the highest levels of precision.

• The balanced design helps reduce vibration at speeds up to 8000 RPM.
• Hubs are manufactured from 2024 t351 aluminium bar stock for a precise fit, superior strength, and a bright finish.
• Standard part numbers for clamp and set screw hubs with inch, metric, keyed, or keyless bores.
• Full product information is available upon request.