Generally speaking, the large tonnage chain block refers to the chain block with a bearing weight of more than 40 tons. The standard load-bearing specifications of large tonnage chain block of Hangzhou guanhang machinery are 40 tons, 50 tons, 75 tons, 80 tons and 100 tons, and the standard lifting height is 3 meters. With the increase of lifting height, the load-bearing is reduced.

For example, if a 40 ton chain block is used for a lifting height of 4 meters, its standard bearing is 33.8 meters (the standard bearing is different from the breaking bearing).