Chain sprockets 87 Chain sprockets 880 2.28/58 B 0.63/16 S OD PD B OD PD 2.28/58 0.63/16 S Split idler sprocket, molded Part Article-Nr. Z- Bore in PD in-mm OD in-mm S in-mm 549 54951Y 10 1 4.85/123,3 4.80/122,0 2.57/65,25 549 54952Y 1¹⁄₄ 549 54953Y 1⁷⁄₁₆ 549 54954Y 1¹⁄₂ 550 55051Y 12 1 5.79/147,2 5.80/147,3 3.04/77,2 550 55052Y 1¹⁄₄ 550 55053Y 1⁷⁄₁₆ 550 55054Y 1¹⁄₂ Material: Reinforced polyamide Screws: Stainless steel Nuts: Zinc plated steel 880 Split drive sprocket, molded Also suitable for Series 828 - 878 - 879 M - 879 TAB Part Article-Nr. Z- Bore in PD in-mm OD in-mm S in-mm 549 54901Y 10 1 4.85/123,3 4.80/122,0 2.57/65,25 549 54902Y 1¹⁄₄ 549 54903Y 1⁷⁄₁₆ 549 54904Y 1¹⁄₂ 550 55001Y 12 1 5.79/147,2 5.80/147,3 3.04/77,2 550 55002Y 1¹⁄₄ 550 55003Y 1⁷⁄₁₆ 550 55004Y 1¹⁄₂ Improved Design and Performance Improved Design and Performance