Chain sprockets 81 Chain sprockets 881 B 2.09/53 1.26/31.8 OD PD S Split idler sprocket, molded Part Article-Nr. Z- Bore in PD in-mm OD in-mm S in-mm 518 51851Y 21 1 5.09/129,3 5.08/129,0 2.67/67,8 518 51852Y 1¹⁄₄ 518 51853Y 1⁷⁄₁₆ 518 51854Y 1¹⁄₂ 519 51951Y 23 1 5.56/141,2 5.60/142,0 2.90/73,8 519 51952Y 1¹⁄₄ 519 51953Y 1⁷⁄₁₆ 519 51954Y 1¹⁄₂ 520 52051Y 25 1 6.03/153,2 6.06/154,0 3.14/79,8 520 52052Y 1¹⁄₄ 520 52053Y 1⁷⁄₁₆ 520 52054Y 1¹⁄₂ 2.09/53 1.26/31.8 B OD PD S Material: Reinforced polyamide Screws: Stainless steel Nuts: Zinc plated steel 881 Split drive sprocket, molded Used for Series 881 B and 881 TAB Part Article-Nr. Z- Bore in PD in-mm OD in-mm S in-mm 518 51801Y 21 1 5.09/129,3 5.08/129,0 2.67/67,8 518 51802Y 1¹⁄₄ 518 51803Y 1⁷⁄₁₆ 518 51804Y 1¹⁄₂ 519 51901Y 23 1 5.56/141,2 5.60/142,0 2.90/73,8 519 51902Y 1¹⁄₄ 519 51903Y 1⁷⁄₁₆ 519 51904Y 1¹⁄₂ 520 52001Y 25 1 6.03/153,2 6.06/154,0 3.14/79,8 520 52002Y 1¹⁄₄ 520 52003Y 1⁷⁄₁₆ 520 52004Y 1¹⁄₂