Specificationsd16,2 mmTolerance: 0 / +0,1D k99,2 mmB18,3 mmC12 mmC 110,5 mmC 2 min1,5 mmD40 mmD 091,6 mmp3/4 inchPitchz15Number of teethm0,42 kgMassFor chains to DIN 8187Material: Sintered iron D 39Hardness: HB 105 +/- 15Composition 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)