Chain sprockets 79 Chain sprockets Material: Reinforced polyamide Screws: Stainless steel Nuts: Zinc plated steel 815 B 2.09/53 S 1.89/48 OD PD B S 2.09/53 1.89/48 OD PD Split idler sprocket, molded Part Article-Nr. Z- Bore in PD in-mm OD in-mm S in-mm 508 50851Y 21 1 5.09/129,3 5.08/129,0 2.67/67,8 508 50852Y 1¹⁄₄ 508 50853Y 1⁷⁄₁₆ 508 50854Y 1¹⁄₂ 509 50951Y 23 1 5.56/141,2 5.60/142,0 2.90/73,8 509 50952Y 1¹⁄₄ 509 50953Y 1⁷⁄₁₆ 509 50954Y 1¹⁄₂ 510 51051Y 25 1 6.03/153,2 6.06/154,0 3.14/79,8 510 51052Y 1¹⁄₄ 510 51053Y 1⁷⁄₁₆ 510 51054Y 1¹⁄₂ 815 Split drive sprocket, machined Used also for Series 881 M Part Article-Nr. Z- Bore in PD in-mm OD in-mm S in-mm 508 50801Y 21 1 5.09/129,3 5.08/129,0 2.67/67,8 508 50802Y 1¹⁄₄ 508 50803Y 1⁷⁄₁₆ 508 50804Y 1¹⁄₂ 509 50901Y 23 1 5.56/141,2 5.60/142,0 2.90/73,8 509 50902Y 1¹⁄₄ 509 50903Y 1⁷⁄₁₆ 509 50904Y 1¹⁄₂ 510 51001Y 25 1 6.03/153,2 6.06/154,0 3.14/79,8 510 51002Y 1¹⁄₄ 510 51003Y 1⁷⁄₁₆ 510 51004Y 1¹⁄₂ Improved Design and Performance Improved Design and Performance