Browning DS40A17 is a Type A double-single roller chain sprocket designed for No. 40 chain, with a 1/2 in pitch and a 1/2 in plain bore. It features 17 teeth and an outer diameter of about 2.98 in (2.975 in as listed in Martin/Regal Rexnord catalogs), a pitch diameter of 2.721 in, and a through-bore length of 1-13/32 in. The sprocket is manufactured from steel and is reboreable, with bore options ranging from 1/2 in up to 1-5/16 in in diameter, enabling customization to different shaft sizes. It is intended to drive two single-strand No. 40 roller chains and weighs approximately 2.0 lb, making it a compact, two-chain drive option within the Browning/Martin catalog ecosystem.
