08A (ASA 40) sprockets

08A (ASA 40) sprockets fit 40 chain of 1/2" (12.7 mm) pitch to ANSI B29.1 - the most popular American chain, found in agricultural machinery, conveyors and equipment imported from the USA and Asia.

ASA 40 sprockets to ANSI B29.1 - fit 40 chains from different manufacturers

Standard compliance means the sprocket works with 40 chain from any manufacturer - you can replace a worn sprocket without hunting for the original part. Standard C45 steel sprockets are easy to fit to the shaft, and for high-speed drives and drives working in dust you can choose the version with hardened teeth, which keeps its tooth profile longer.

08A sprockets (40-1, 40-2, 40-3) with hub, plate and hardened

Simplex, duplex and triplex sprockets (40-1, 40-2, 40-3) with a pilot bore hub, and plate wheels for welding or bolting on. Selected simplex hub sprockets have hardened teeth. A stainless steel 08A sprocket can be found in the Stainless steel sprockets group.

How to tell 08A from 08B - questions about ASA 40 sprockets

How do I tell 08A chain from 08B?

The easiest way is to measure the roller - on 08A chain it is 7.92 mm, on 08B 8.51 mm. American chains also usually have the number 40 stamped on the plates.