Belt sprockets 189 Belt sprockets B 0.49/12.5 1.77/45 OD PD S 552 Material: Polyamide Screws: Stainless steel Nuts: Zinc plated steel 552 Split idler sprocket, machined Part Article-Nr. Z- Bore in PD in-mm OD in-mm S in-mm 1611 161150 16 0.71* 5.12/130,2 5.14/130,6 2.31/58,7 1611 161151Y 1 1611 161152Y 1¹⁄₄ 1611 161153Y 1⁷⁄₁₆ 1611 161154Y 1¹⁄₂ 1612 161250 18 0.71* 5.76/146,3 5.78/146,9 2.63/66,8 1612 161251Y 1 1612 161252Y 1¹⁄₄ 1612 161253Y 1⁷⁄₁₆ 1612 161254Y 1¹⁄₂ 1613 161350 21 0.71* 6.71/170,4 6.72/170,7 3.10/78,8 1613 161351Y 1 1613 161352Y 1¹⁄₄ 1613 161353Y 1⁷⁄₁₆ 1613 161354Y 1¹⁄₂ 1614 161450 25 0.71* 7.98/202,7 8.04/204,2 3.74/95,0 1614 161451Y 1 1614 161452Y 1¹⁄₄ 1614 161453Y 1⁷⁄₁₆ 1614 161454Y 1¹⁄₂