Roller Chain Idler Sprockets

About

Idler Sprockets – Chain Tensioning and Alignment Solutions Bolton Engineering Products Ltd supplies a complete range of idler sprockets designed to enhance chain performance, minimize wear, and keep proper tension in roller chain systems. Our idler sprockets with bearings are developed to ANSI standards and provide a precise fit and long-term reliability for a variety of industrial, agricultural, and mechanical uses. Whether you require a fixed idler sprocket or a chain idler sprocket on a tensioning arm, BEP Ltd has a solution in stock. What Is an Idler Sprocket? An idler sprocket (also known as an idler wheel) is a hubless sprocket fitted with a sealed ball bearing, allowing it to rotate freely around a fixed shaft or tension arm. Its main function is to guide, tension, and maintain alignment in roller chain systems — particularly when chain length, routing, or load variation causes slack. Common Uses Include: Reducing chain vibration and noise Maintaining correct chain engagement with drive and driven sprockets Routing chains around obstructions or corners Compensating for chain stretch over time Technical Specifications Specification Details Product Type Chain Idler Sprocket Design Flat, Hubless with Pressed Bearing Bearing Type Sealed Ball Bearing with Wide Inner Race Material Hardened Steel / Carbon Steel Tooth Hardness Induction-Hardened Teeth for Extended Life Chain Pitch Compatibility ANSI Standard Roller Chain Sizes (25 – 100 & Above) Mounting Type Fixed Shaft / Tensioned Arm Lubrication Maintenance-Free Sealed Bearing Optional Features Double-Row Bearings / Stainless Steel Models Available Compliance ANSI / ISO Standards Key Features & Benefits Sealed Bearings: High-Quality Sealed Ball Bearings are used for every sprocket. Hardened Teeth: Heat actively and precisely machined for extended component life. Flexible Installation: Compatible with Fixed shaft or Tensioned Arm installation. Standard Compatibility: Suitable for every ANSI standard roller