Router Bit Types Explained Without the Marketing Noise
Most people buying router bits have no idea what half of the designs actually do until they cut their first workpiece. The Guide Router Bit Types Chart exists because the industry standard naming conventions are about as clear as mud, and I have spent years seeing the same mistakes repeated in forums and shops. There are roughly ten primary router bit categories that cover 95% of what you will ever need. Beyond that, you are in specialty territory where a single bit might cost more than a decent used drill press. The problem is that every manufacturer labels their geometry differently, and a "round over" from one brand can behave completely differently from the same-named bit from another brand due to pilot bearing placement, flange size, and cutter profile variations.
Guide Router Bit Types Chart
Here is the practical breakdown of what each bit type does, when it fails, and how to recognize when you are looking at a bit that was ground for a specific purpose rather than general use. Straight router bits come in two main forms. The plain straight bit is what you use for dados, grooves, and trimming laminates. The spiral straight bit has a helical flute that pulls material upward or downward depending on whether it is an upcut or downcut variant. Upcut spirals clear chips aggressively but leave a rough top surface. Downcut spirals push chips down, giving a clean top edge but packing chips into the cut, which can cause burning on deep passes through hardwoods. Both-up spiral bits exist as a compromise and are now the default choice for most cabinetmakers because they handle both plywood and solid wood reasonably well. I ran into a specific issue last year where a customer brought me a batch of white oak cabinet doors with burned edges from a cheap upcut spiral bit. The problem was not the bit quality alone. He was taking full-depth cuts at his router speed, which was around 24,000 RPM, but the feed rate was too slow because he was hand-guiding the router against the grain direction. Switching to a both-up spiral and reducing each pass to a quarter-inch depth dropped the burn marks to zero and cut cycle time per door from about eight minutes to roughly four.
Easing and Edge-Forming Bits
Round-over bits form a convex curve on an edge. The radius determines how aggressive the profile is. A quarter-inch round-over on a three-quarter inch board removes nearly half the edge thickness, which changes how pieces fit together in some joinery situations. Beaded bits add a decorative bump profile that requires a different coping strategy during assembly. Oversized beads on thin stock will break during routing if you do not leave enough material behind the bead, typically at least a five-sixteenths inch backing. Chamfer bits cut a 45-degree angle on an edge and are frequently used for beveling the edges of tables or removing sharp corners on workbenches. They are also the go-to bit for V-groove joinery when two chamfered edges meet to form a decorative seam. I learned the hard way that a chamfer bit with a pilot bearing will skip and bounce on softer materials like pine if the bearing is slightly worn, because the soft wood cannot hold the bearing's track. The fix was switching to a bearing-guided pattern bit setup where the bearing rides the template instead of the workpiece edge.
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Dado and Groove Bits
Stackable dado sets let you build a custom width groove by combining straight cutters with shim plates. A typical set includes two outer cutters with opposing spiral flutes and a series of shims ranging from point zero to point inches thick. The advantage over a fixed-width dado bit is flexibility, but the downside is runout. If your arbor or router collet has any lateral wobble, the shim stack amplifies it, and you end up with a groove that is wider than your measurement by a few thousandths on the high side. For production work where consistency matters, a fixed-width groove cutter saves the shim stacking entirely. The trade-off is that you need a separate bit for every common groove width, which adds up in cost and storage space. I keep a point inch, a point inch, and a one inch fixed groove bit on hand and use the stackable set only when I need a non-standard dimension.
Profile and Decorative Bits
Cove bits cut a concave profile and are often paired with a round-over bit on the opposite edge of the same board to create an ogee profile without buying a dedicated ogee bit. This pairing trick saves money but requires two separate routing passes and careful fence alignment. The first pass sets the cove, and the second pass flips the board to hit the adjacent edge, which means your fence distance needs to account for the bit radius correctly. Ogee bits produce the classic S-curve used on furniture edges and cabinet doors. Cheap ogee bits with a small diameter cutter tend to chatter on hardwoods because the thin profile lacks stiffness. A full-size ogee bit with a one inch shank and larger cutter body will run smoother but costs two to three times as much. The middle-ground option is a carbide-tipped ogee with a point five inch shank, which handles most shop work without excessive vibration.
Panel Raising Bits
Panel raising bits cut the tenon profile on the edge of a flat panel so it fits into a groove in a frame, creating a classic raised panel door. These bits require a two-pass process. The first pass forms the main tenon profile, and the second pass trims the shoulders to the correct width. Some manufacturers sell matched sets where the first and second pass bits are designed to work together, but mixing brands in the set often results in misaligned tenons that do not seat flush in the frame groove. The biggest pitfall with panel raising is grain direction. Routing with the grain produces a clean surface, but routing against the grain on figured or curled grain causes tear-out on the panel shoulder. I solve this by taking a light finishing pass in the problematic direction rather than trying to remove all the material in the initial cut. A half-inch depth in the first pass and a point five inch finishing pass keeps the surface usable on most hardwoods.
Dovetail and Joinery Bits
Dovetail bits cut the interlocking pins and tails used in drawer construction. The two main types are straight-template dovetail bits and spiral dovetail bits. Straight-template bits require a matching template guide bushing and produce clean dovetails in a single pass. Spiral dovetail bits can be used freehand or with a jig and cut faster but leave a slightly rougher surface that often needs hand sanding. The counter-intuitive part here is that a larger dovetail bit does not always produce a stronger joint. A pointfive inch SPI spacing creates a joint that is visually proportionate for a one-inch thick drawer front, while a pointthree seven five inch SPI spacing looks cramped and reduces the bearing surface area on each tail. The rule of thumb is that the dovetail width should be roughly one-third of the stock thickness for a structurally sound and aesthetically balanced joint.
Trim and Flush Trim Bits
Flush trim bits have a bearing that rides along a template or the edge of a workpiece while the cutter removes material to match the profile underneath. The bearing diameter must match the cutter diameter for accurate tracking, and using a bearing that is larger than the cutter will produce an oversized profile, while a smaller bearing leaves material behind. This is a common source of errors for people who mix bearings from different bit sets. Pattern router bits operate on the same principle but are designed for production environments where the same profile is cut repeatedly. The cutter is mounted in a CNC or a dedicated pattern router, and the template is a hard material like Delrin or steel. For hand router use, a flush trim bit with a replaceable bearing is more practical because bearings wear out and need swapping when cutting abrasive materials like MDF, which accelerates bearing wear significantly compared to solid hardwoods.
V-Groove and Lettering Bits
V-groove bits cut a angular channel used for decorative inlay lines, lettering, and separating panels. The angle determines the sharpness of the groove, with point degree and point degree being the most common. A narrower angle produces a finer line but requires more passes to achieve depth, which increases the chance of bit deflection on harder materials. The limitation with V-groove bits is that they are inherently weak at the tip because the crossing cutting edges create a fragile point. Carbide tips mitigate this somewhat, but hammersmithed or milled steel V-groove bits will chip if dropped or if the router hits a knot. I keep a spare on hand at all times and never attempt to resharpen a damaged V-groove bit because the angle geometry is too precise for aftermarket regrinding to replicate accurately.
Specialty and Overlap Considerations
Biscuit joiner bits are specifically sized for the oval-shaped slots cut for biscuit joints. Using a standard straight bit to widen a biscuit slot is possible but produces a poorly shaped pocket that compromises joint strength. The dedicated biscuit bit cuts a slot with the correct oval geometry in a single pass. Hinge mortising bits have a stepped profile that cuts the recess for a concealed cabinet hinge in one operation. These are highly specialized and only useful if you are installing that hinge type regularly. For occasional hinge installation, a standard straight bit and careful measurement produce acceptable results without the cost of a dedicated bit. The reality of working with router bits is that no single chart replaces hands-on experience. The geometry determines what the bit can do, but the material, feed rate, router power, and collet condition determine how well it actually performs. A pointnine three seven five inch carbide straight bit in a worn collet will cut worse than a point inch HSS bit in a fresh collet, and understanding that relationship saves more scrap wood than any chart ever will.
