Daido are a manufacturer of quality TRP Transmission & Conveyor Chain. P.T. Parts distribute a large range of chain products which includes:
Transmission Chain British Standard Chain from 8mm and 3/8" pitch up to 1" pitch.  American Standard Chain from 1/4" pitch up to 1" pitch.  Nickle Plated Chain Stainless Steel Chain
Conveyor Chain Double Pitch Conveyor Chain in small roller and large roller, in pitch lengths of 1 inch up to 2 inch.