28A (ASA 140) sprockets work with simplex 140 chain of 1 3/4" (44.45 mm) pitch to ANSI B29.1. This chain runs in very heavy, slow-running drives - in mining machinery, handling equipment and large conveyors.
28A (ASA 140) sprockets - replacements for original sprockets without a long search
Sprockets of this size are most often bought as spare parts for specific machines. Thanks to standard compliance you do not need to look for the original sprocket - a C45 steel sprocket will replace the worn part and work with 140 chain from any manufacturer.
ASA 140 simplex sprockets - with hub and plate type for welding
140-1 simplex sprockets with a pilot bore hub, and plate wheels for welding or bolting to a flange.
Fitting a large plate wheel and other questions about 28A sprockets
What should I watch out for when fitting a large plate wheel?
The plate is bored to suit the hub or flange and accurately centred before welding or bolting. Rim runout on such a large sprocket quickly wears the chain.
