The GF Coupling consists of two steel hubs with external crowned and barrelled gear teeth, Oxidation blacked protection, connected by a synthetic resin sleeve. The sleeve is manufactured from high molecular weight polyamide, thermally conditioned and impregnated with solid lubricant to provide a long maintenance-free life. This sleeve has high resistance to atmospheric humidity and an operating temperature range of –20˚C to +80˚C with ability to withstand 120˚C for short durations.