Specificationsd16,2 mmTolerance: 0 / +0,1D k70,5 mmB18,3 mmC12 mmC 17 mmC 2 min1,1 mmD40 mmD 065,1 mmp1/2 inchPitchz16Number of teethm0,16 kgMassFor chains to DIN 8187Material: Sintered iron C 10Hardness: HB 50 +/- 10Composition of designation using example of roller chain idler sprocket unit KSR15-B0-06-10-20-08KSR Roller chain idler sprocket unit15 Bearing bore diameterB0 Radial insert ball bearing with eccentric locking collar, Series RAE. . -NPP06 Sprocket pitch in 1/16", code10 Chain code (width index or relevant standard)20 Number of teeth08 Material code (sintered iron)