one.R-roller
R-roller Conveyor Chains have rollers with an outer diameter larger compared to the width of plates.
Because the 
rollers can effortlessly roll, the chain is suitable for operating around the floor whilst the rollers get the dwell load.
2.F-roller
F-roller Conveyor Chains have rollers using the same outer diameter as that of R-roller but with flanges.
Because the flanges can obtain the force acting over the lateral sides with the chain, the chain is appropriate for receiving each a live load and a lateral load.
three.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 all the sprockets. Because the chain is light in excess weight, it is actually ideal for vertical conveyance.
four.S-roller
S-roller Conveyor Chains have rollers with an outer diameter smaller sized than that from the M-roller.
The chain is appropriate for vertical conveyance wherever rollers are significantly less more likely to be worn.
5.BR- and BF- Rollers (with built-in bearings)
BR- and BF- Roller Conveyor Chains have mainly identical framework to R-roller and F Conveyor Chains, respectively, except for that bearings inside for smoother rotation.
six.UR- and UF- Rollers (significant clearance between bushing and roller)
UR- and UF- Roller Conveyor Chains have typically identical construction to R-roller and F Conveyor Chains, respectively. Even so, the clearances involving the outer diameter of bushings along with the inner diameter with the rollers are enlarged to prevent the rollers from fixing when foreign matters enter.