5/8 steel ball bearing guide from Amana Tool is a precision ball bearing guide designed for routing applications where the bearing controls the cut. It uses only the finest industrial quality precision ball bearings available, which supports smooth tracking along templates or edges so the cutting edge follows your layout consistently. The bearing diameter (D) is 5/8 inch, so the cutter follows a 5/8 inch outside reference for predictable offset. The cutting height (B) is 3/16 inch, matching applications that need a 3/16 inch tall bearing surface to support the bit without dragging on adjacent material. A 3/16 inch bore (d) centers the bearing on a 3/16 inch shaft, helping the assembly run true and reducing vibration at the bit.
This 3/16 x 5/8 ball bearing guide is built around precise dimensions that matter when matching to a router bit assembly. The 5/8 inch outside diameter sets the guide surface the work will follow, so bit designs using a 5/8 inch bearing can keep their intended cutting geometry. The 3/16 inch cutting height defines how much of the bearing contacts the guide surface, supporting positive tracking without digging into the material around it. The 3/16 inch bore is sized for a 3/16 inch shaft, helping the bearing mount squarely on the arbor or screw so the bit and bearing spin on the same centerline.
This Amana Tool 5/8 inch steel ball bearing guide fits into routing setups where a 3/16 inch bore bearing controls the cut path. In template and edge routing, the 5/8 inch diameter lets the bearing follow jigs, patterns, or work edges while the bit trims material to match. The 3/16 inch cutting height keeps the active bearing surface compact, which supports use on narrow templates or thin stock where excess bearing height could interfere. As a replacement part in the Bits and Blades Accessories and Replacement Parts category, it drops into assemblies built around a 3/16 inch shaft, restoring guided cutting when an older bearing has worn out or seized. The industrial quality precision ball bearings support repeatable use in shop environments where routers and bits see regular duty.
The double steel-shielded construction gives the bearing guide extra rigidity and inhibits dust, so contaminants are better kept away from the moving elements that provide smooth rotation. This helps the bearing roll instead of skid along the template, which supports cleaner edges and reduces stress on the bit. A special high-performance, high-temperature grease is used for maximum life, so the bearing is prepared for the heat that builds during continuous routing passes. The note that solvents should not be used to clean ball bearings reflects the need to protect this grease, since solvents will deteriorate the special grease and reduce performance. When a bearing becomes frozen - one that does not rotate freely - it should be replaced immediately, restoring free rotation so the router bit again follows the guide surface instead of dragging and burning. Together, these details help keep guided routing consistent over time.
The 5/8 inch steel ball bearing guide has a diameter (D) of 5/8 inch, so any bit or template setup using a 5/8 inch bearing can maintain its intended cutting offset.
The Amana Tool 47718 ball bearing guide has a 3/16 inch bore (d), so it fits on a 3/16 inch shaft to keep the bearing centered with the cutting edge.
The guiding surface, or cutting height (B), is 3/16 inch, which provides a compact contact area for following templates or edges without excess bearing height.
The ball bearing guide uses double steel shields for extra rigidity and to inhibit dust, which helps protect the moving elements and supports smoother, more consistent rotation.
The bearing uses a special high-performance, high-temperature grease for maximum life, so it can handle routing heat while maintaining smooth operation.
A frozen bearing, one that does not rotate freely, should be replaced immediately so the router bit can again follow the guide surface without dragging.
The Amana Tool 3/16 x 5/8 ball bearing guide pairs a 5/8 inch diameter with a 3/16 inch bore and 3/16 inch cutting height, matching router bit assemblies built around these dimensions. Its industrial quality precision ball bearings, double steel shields, and high-temperature grease support smooth, guided routing when a reliable replacement bearing is needed for shop work.