1.R-roller
R-roller Conveyor Chains have rollers with an outer diameter bigger compared to the width of plates.
Since the rollers can conveniently roll, the chain is appropriate for operating around the floor although the rollers get the dwell load.
two.F-roller
F-roller Conveyor Chains have rollers using the same outer diameter as that of R-roller but with flanges.
Since the flanges can receive the force acting around the lateral sides of your chain, the chain is suitable for receiving each a live load and a lateral load.
3.M-roller
M-roller Conveyor Chains have rollers with an outer diameter slightly smaller than the width of plates.
An M roller is made for 
smoother engagement with the sprockets. Because the chain is light in bodyweight, it’s suitable for vertical conveyance.
4.S-roller
S-roller Conveyor Chains have rollers with an outer diameter smaller than that of the M-roller.
The chain is appropriate for vertical conveyance in which rollers are less likely to be worn.
5.BR- and BF- Rollers (with built-in bearings)
BR- and BF- Roller Conveyor Chains have mostly identical construction to R-roller and F Conveyor Chains, respectively, except to the bearings within for smoother rotation.
6.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. Nonetheless, the clearances in between the outer diameter of bushings and also the inner diameter of the rollers are enlarged to stop the rollers from fixing when foreign issues enter.
