F-Series six beam couplings are designed for precision light-duty power transmission in motion control applications, such as connecting servo motors to lead screws. Their larger body size and reinforced six-beam design deliver higher torque capacity and reduced windup without compromising flexibility or misalignment compensation. Ideal for demanding reversing servo systems, these couplings help ensure accuracy, repeatability, and system reliability.
Manufactured by Ruland in the USA, F-Series couplings are available in lightweight 7075 aluminum for low inertia or durable 303 stainless steel for increased torque. Select models feature socket head cap screws with Ruland’s proprietary Nypatch® coating, which minimizes vibration, prevents thread loosening, and reduces galling in stainless steel assemblies.









Short Rigid Couplings
Controlflex Couplings
Jaw Couplings
Oldham Couplings
Bearing Locknuts – TCN
Double Wide Shaft Collars
Heavy Duty Shaft Collars
International Series Shaft Collars
Keyed Shaft Collars
Mountable Shaft Collars
Quick Clamping Shaft Collars
Set Screw Shaft Collars
Thin Line Shaft Collars
Threaded Shaft Collars – Pacific International Bearing Products
Two-Piece Shaft Collars
Friction Bearing Universal Joints
Needle Bearing Universal Joints