The difference between 6 inch and 8 inch hydraulic chuck, hydraulic chuck oil cylinder

Take the rotary hydraulic cylinder of Taiwan as an example, the 8 inch hollow hydraulic chuck hole is 52mm, the corresponding hollow hydraulic rotary cylinder is 52mm, as behind a thousand P1552 two digit is a hollow hydraulic rotary cylinder hole diameter identification.6 inch hollow chuck hole diameter is 46mm, the corresponding cylinder is 46mm (model is P1246).
The above is the common sense, the key.
Hydraulic cylinder 8 inch and 6 inch is not the same, but can be generic, just pull two thread is not the same, a head may be M60, a M55 may be. If you are a long workpiece, the diameter of more than 46mm, it can only use the standard 8 inch cylinder (52mm holes).
6 inch by 8 inch chuck oil cylinder, a bit small Mara crane feeling, affect the service life, can be used in a cylinder of 10 years, you're using, estimated 6-8 years.
Some assembly chuck or sell chuck, also recommended for use in solid cylinder pull hollow chuck, so that the replacement cycle is short, the more is the small horse drawn carts, some domestic hundreds of money in the cylinder, and then months soon broken, Taiwan that perhaps 1-3 years, but this is to allow customers to cost increase.