one.R-roller
R-roller Conveyor Chains have rollers with an outer diameter greater than the width of plates.
Because the rollers can conveniently roll, the chain is suitable for operating about the floor whilst the rollers acquire the live load.
2.F-roller
F-roller Conveyor Chains have rollers with the same outer diameter as that of R-roller but with flanges.
Because the flanges can acquire the force acting over the lateral sides in the chain, the chain is ideal for obtaining both a live load and a lateral load.
three.M-roller
M-roller Conveyor Chains have rollers with an outer diameter slightly smaller sized compared to the width of plates.
An M roller is developed for smoother engagement together with the sprockets. Since the chain is light in excess weight, it is actually suitable for vertical conveyance.
4.S-roller
S-roller Conveyor Chains have rollers with an outer diameter smaller sized than that of your M-roller.
The chain is suitable for vertical conveyance wherever rollers are much less likely to be worn.
five.BR- and BF- Rollers (with built-in bearings)
BR- and BF- Roller Conveyor Chains have primarily identical structure to R-roller and F Conveyor Chains, 
respectively, except for that bearings inside for smoother rotation.
six.UR- and UF- Rollers (significant clearance among bushing and roller)
UR- and UF- Roller Conveyor Chains have typically identical structure to R-roller and F Conveyor Chains, respectively. However, the clearances among the outer diameter of bushings and also the inner diameter with the rollers are enlarged to prevent the rollers from repairing when foreign matters enter.
