A continuous slat conveyor, 36 metre centres of head and tail sprockets, is to carry boxed products 650mm x 800mm, of mass 36kg each. 50 boxes will be the maximum load and two chains are required with K attachments at every pitch one side. 152.4mm pitch chain is preferred and the mass of the slats is 15kg/m. Operating conditions are clean and well lubricated. Chain speed would be 0.45 m/sec using 8 tooth sprockets.