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Flattening, Surfacing, & Planing Router Bits

If you are looking to trim down a surface, then the flattening router bit is the right choice. A surfacing router bit is a larger router bit that is used for several different woodworking tasks. Also called a router flattening bit, slab flattening router bit, planer router bit or router surfacing bit. Each AstraHP-Coated router planing bit can be used with a flattening jig and handheld router to flatten a large slab. A surface planing router bit can even flatten epoxy coated projects such as inlays or signs.

A router bit for planing can also be used in a CNC machine to flatten or surface the spoilboard. (The spoilboard is the layer that your workpieces sit upon which using the CNC). Surfacing the spoilboard ensures that the workpiece with be parallel with the CNC spindle or router while cutting a design. This is especially important with carving or sign making.


A flattening router bit is also used on CNC machines to flatten large slabs, such as tabletops, bench tops and river tables. We use a flattening router bit to flatten slabs for sign making here in our shop. We carry several options for a surfacing router bit; both for routers and CNC machines. Choose from 1/4″ shank W-6210, or the 1/2″ shank W-6220, or opt for the replaceable, indexable insert style of the SF-525 or SBU25-2. Whatever your flattening needs are, we have a surfacing router bit to get it done!