New F-series couplings from Ruland Manufacturing feature six beams, configured as two sets of three spiral cuts. Compared with typical beam couplings that have fewer spiral cuts, F-series beams are shorter and have a steeper angle, giving them a greater torque capacity and making them more resistant to wind-up. F-series couplings are available in five different body sizes, in stainless steel or aluminium, with outside diameters ranging from 15.9mm to 38.1mm. Bores range from 5mm to 19mm. Both set-screw style and clamp-style hubs are offered.