Overview Reviews Product Description The sintered-steel sprockets are hardened and perform well at an economical cost The roller chain idler sprocket replaces the hardened plate steel sprockets on most applications All units are non-relubricatable Timken Fafnir Mounted Ball Bearing Catalog Timken Fafnir Competitive Interchange Chart Product Videos Custom Field Chain series 40 Tooth count 18 Product Reviews Write a Review Write a Review × Timken 40 x 18T w/ 203KRR2 Hardened Idler Sprocket 010-4018-S Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *