A

to the disc, or side panels, D1 is the diameter of the disc.
B refers to the outer cylinder, D2 outer tube diameter.
C refers to the inner cylinder. Inner tube is usually iron.
D refers to the shaft, D3 shaft hole diameter.
E refers to the screw.
F refers to the Bowl gaskets
G refers to the towing pad, or for carrying-hole
L1 is the total length of.
L2 is within the length or width of the disk.
Side diameter, outer diameter and neikuan directly affect length of the winding;
Bore size, length and traction pore size affect related equipment when used with the size (in general these dimensions are processed according to the relative dimensions of the device).