Sunnen L4-J99 Honing Stones

Sunnen L4-J99 Honing Stones are Sunnen replacement stones designed for use with L4-series honing units in bore-finishing systems. They are loaded into compatible stone carriers and used during honing strokes to remove material and produce a consistent surface finish on cylindrical bores when paired with Sunnen honing oil and a properly aligned mandrel. The L4-J99 designation identifies the specific stone type within the L4 lineup, helping ensure compatibility with Sunnen accessories and holders in the honing ecosystem. In typical operation, technicians mount the stones in a carrier, monitor lubricant flow, and apply controlled strokes to achieve repeatable dimensions and roundness in precision components. To maximize life and maintain performance, follow Sunnen’s guidance on break-in, conditioning, and regular inspection of stone wear and carrier alignment. These stones are part of Sunnen’s broader portfolio of honing abrasives that support precise bore finishing across a range of materials when used within Sunnen systems.