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Metric Roller Chain Idler Sprockets

Metric idler sprockets are utilized on Metric Roller Chain and are designed to direct and carry a roller chain in a desired direction. Because it is an idler it requires the energy or "pull" of a drive sprocket. Using a high-quality bearing or material in an idler sprocket means less friction in your setup with better energy transfer while using less energy. Both our metric and ANSI idler sprockets are made to out-last and out-perform the competition. Below are the standard metric idler sprockets but different sizes, tooth counts, and configurations are available upon request.

Metric Idler Sprocket Size Chart


Sprocket Size Tooth Count (OD) (N) (T) (ID) (BD) (H) (L) Weight (kg)
05BB23 23 58.75mm 62.0mm 7.0mm 16mm 40mm 18.3mm 12mm 0.14
06BB21 21 63.9mm 68.0mm 5.3mm 16mm 40mm 18.3mm 12mm 0.15
081BB18 18 73.1mm 78.9mm 7.0mm 16mm 40mm 18.3mm 12mm 0.20
083BB16 16 65.1mm 70.9mm 7.0mm 16mm 40mm 18.3mm 12mm 0.20
08BB16 16 65.1mm 69.5mm 7.2mm 16mm 40mm 18.3mm 12mm 0.20
08BB18 18 73.1mm 78.0mm 7.2mm 16mm 40mm 18.3mm 12mm 0.20
10BB15 15 86.4mm 93.0mm 9.1mm 16mm 40mm 18.3mm 12mm 0.20
10BB17 17 86.4mm 93.0mm 9.1mm 16mm 40mm 18.3mm 12mm 0.30
12BB15 15 91.6mm 100.0mm 11.1mm 16mm 40mm 18.3mm 12mm 0.40
16BB12 12 98.1mm 109.0mm 16.2mm 20mm 47mm 17.7mm 14mm 0.65
20BB13 13 132.7mm 148.0mm 18.5mm 25mm 52mm 25.4mm 15mm 0.73


Frequently Asked Questions

  • If your order is less than $300, no problem! Please give us a call at 407-347-3519 or email Sales@usarollerchain.com, and we will be happy to assist you!

  • USA Roller Chain utilizes an extensive network of vendors and warehouses to ensure you get your items quickly! Our primary roller chain warehouse is located in Clermont, FL, but we have warehouses located all across the United States. Your order will be shipped from the closest warehouse to you that has your requested product in stock. This speeds up transit times and saves you money on shipping! If you have any questions about where an item will ship from, please CONTACT US

  • In-stock items are typically shipped out in 1-3 business days.Made-to-order item lead times vary from 1-2 days up to 14-20+ weeks, depending on the product. If you need your items urgently, please let us know, and we will do our best to meet your required delivery date! If you have any questions, please CONTACT US

  • If you are having an issue with your order, please CONTACT US as soon as possible so we can resolve it for you.

    Most in-stock items can be returned within 30 days of the shipment date. MTO or Custom orders are not eligible for a return or refund. For a detailed explanation of our return policies, please click here.

  • Absolutely! We may be called "USA Roller Chain", but we ship worldwide! Please CONTACT US for Export/International quotes or orders.