Chain sprockets 88 Chain sprockets 882 Split idler sprocket, machined B 1.67/42.5 0.87/22 OD PD S B 1.67/42.5 0.87/22 OD PD S Part Article-Nr. Z- Bore in PD in-mm OD in-mm S in-mm 551 55150 9 0.71* 4.38/111,4 4.41/112,0 2.38/60,5 551 55151Y 1 551 55152Y 1¹⁄₄ 551 55153Y 1⁷⁄₁₆ 551 55154Y 1¹⁄₂ 552 55250 10 0.71* 4.85/123,3 4.92/125,0 2.61/66,4 552 55251Y 1 552 55252Y 1¹⁄₄ 552 55253Y 1⁷⁄₁₆ 552 55254Y 1¹⁄₂ 553 55350 11 0.71* 5.32/135,2 5.39/137,0 2.85/72,4 553 55351Y 1 553 55352Y 1¹⁄₄ 553 55353Y 1⁷⁄₁₆ 553 55354Y 1¹⁄₂ 554 55450 12 0.71* 5.79/147,2 5.87/149,0 3.09/78,4 554 55451Y 1 554 55452Y 1¹⁄₄ 554 55453Y 1⁷⁄₁₆ 554 55454Y 1¹⁄₂ Material: Polyamide Screws: Stainless steel Nuts: Zinc plated steel 882 Split drive sprocket, machined Also suitable for Series 8257 Part Article-Nr. Z- Bore in PD in-mm OD in-mm S in-mm 551 55101Y 9 1 4.38/111,4 4.41/112,0 2.38/60,5 551 55102Y 1¹⁄₄ 551 55103Y 1⁷⁄₁₆ 551 55104Y 1¹⁄₂ 552 55201Y 10 1 4.85/123,3 4.92/125,0 2.61/66,4 552 55202Y 1¹⁄₄ 552 55203Y 1⁷⁄₁₆ 552 55204Y 1¹⁄₂ 553 55301Y 11 1 5.32/135,2 5.39/137,0 2.85/72,4 553 55302Y 1¹⁄₄ 553 55303Y 1⁷⁄₁₆ 553 55304Y 1¹⁄₂ 554 55401Y 12 1 5.79/147,2 5.87/149,0 3.09/78,4 554 55402Y 1¹⁄₄ 554 55403Y 1⁷⁄₁₆ 554 55404Y 1¹⁄₂ *Plain Bore