1.R-roller
R-roller Conveyor Chains have rollers with an outer diameter larger than the width of plates.
Since the rollers can quickly 
roll, the chain is ideal for running within the floor though the rollers acquire the live load.
2.F-roller
F-roller Conveyor Chains have rollers with the similar outer diameter as that of R-roller but with flanges.
Since the flanges can acquire the force acting about the lateral sides on the chain, the chain is suitable for acquiring each a live load in addition to 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 built for smoother engagement together with the sprockets. Since the chain is light in bodyweight, it can be suitable for vertical conveyance.
four.S-roller
S-roller Conveyor Chains have rollers with an outer diameter smaller than that with the M-roller.
The chain is suitable for vertical conveyance exactly where rollers are less likely to be worn.
five.BR- and BF- Rollers (with built-in bearings)
BR- and BF- Roller Conveyor Chains have mainly identical structure to R-roller and F Conveyor Chains, respectively, except to the bearings inside for smoother rotation.
six.UR- and UF- Rollers (substantial clearance amongst bushing and roller)
UR- and UF- Roller Conveyor Chains have typically identical structure to R-roller and F Conveyor Chains, respectively. Nevertheless, the clearances amongst the outer diameter of bushings along with the inner diameter with the rollers are enlarged to prevent the rollers from repairing when foreign matters enter.