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Best Straight Cut Router Bits for Clean, Accurate Cuts
For most woodworking, choose a solid-carbide-tipped straight cut router bit with a 1/4-inch shank, a 1/2-inch cutting diameter, and roughly 1 inch of cutting length; move to a 1/2-inch shank for frequent heavy cuts, and use a smaller diameter when the cut is narrow or the router is compact. The best choice depends less on a “premium” label than on matching diameter, cutting length, shank, and edge quality to the material and cut.
A straight bit makes a flat-bottomed groove, dado, or mortise, and can also trim an edge or cut an opening when guided by a template. The table below compares useful sizes by task. Dimensions are representative specifications, not a recommendation to exceed the cutting depth or speed limits stated by a bit’s manufacturer.
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| Bit type and diameter | Typical cutting length | Shank | Best suited to | Key trade-off |
|---|---|---|---|---|
| Small straight bit, 1/4 in (6.35 mm) | About 1/2 in (12.7 mm) | 1/4 in | Narrow grooves, small parts, light template work | Less cutting area; avoid forcing it through deep or wide cuts |
| General-purpose straight bit, 1/2 in (12.7 mm) | About 1 in (25.4 mm) | 1/4 in or 1/2 in | Common dados, grooves, and shallow mortises | A 1/4-in shank is more limiting under heavy load |
| Wide straight bit, 3/4 in (19.05 mm) | About 1 in (25.4 mm) | 1/2 in commonly | Wide grooves, larger openings, and repeated routing | Higher cutting load; needs a suitably powerful, stable setup |
| Long-reach straight bit, 1/2 in (12.7 mm) | About 1-1/2 in (38.1 mm) | 1/2 in commonly | Deeper cuts where the extra reach is necessary | More exposed cutter can deflect; long reach is not a substitute for multiple passes |
Choose by the cut, not by the largest bit
For narrow grooves and a compact router
Use a 1/4-inch-diameter straight bit when the groove itself is narrow. It removes less material per pass and can be easier to control in small work, but its small cutter and 1/4-inch shank make it a poor choice for aggressive deep routing. Keep the cut shallow and let the router’s manual set the permitted speed and capacity.
For everyday dados and grooves
A 1/2-inch-diameter bit is a versatile starting point for cabinet joinery and general shop work. Check that the bit’s cutting length covers the intended depth while leaving enough of the shank securely inside the collet. If the groove is wider than the cutter, make overlapping passes with a fence or guide; do not lean the router sideways to widen it.
For frequent, demanding work
A 1/2-inch shank generally offers greater stiffness than a 1/4-inch shank of comparable design, which helps resist deflection in heavier cuts. It only fits a router with a matching 1/2-inch collet. Never use a reducer, improvised sleeve, or partially engaged shank to make an incompatible bit fit. A larger bit also creates more cutting load, so stiffness alone does not make an overly deep pass safe.
Solid wood versus plywood and other sheet goods
In solid wood, grain direction and species affect the cut. Dense hardwood puts more load on the edges; reversing grain can cause tear-out even with a sharp bit. Take several shallow passes, particularly when routing across end grain, and support the work so vibration cannot shift it.
For plywood, a sharp carbide-tipped bit is usually a practical choice for grooves, dados, and openings. Plywood’s alternating veneers and glue can wear edges faster than clean, straight-grained stock, while face veneers are especially prone to splintering. Use a backer board where possible, keep the work firmly supported, and make a light scoring or shallow first pass before routing to final depth. A down-cut spiral may help keep the top veneer down, but it can pack chips into the cut; choose the cutter style to suit the material and dust extraction.
In MDF, resin and fine abrasive dust can accelerate wear and make dust control important. In all sheet goods, avoid routing unsupported offcuts: a small piece can catch or shift. A template, guide bushing, or straightedge helps control the router, but it does not replace clamping the work securely.
Carbide quality and what wears first
Most woodworking straight bits are high-speed steel or carbide-tipped. Carbide-tipped bits cost more, but their cutting edges generally retain sharpness longer in abrasive sheet materials and repeated use. Solid-carbide bits are available for particular applications, but they are not automatically the best value for every router or job. Look for clean brazing, even cutting edges, and a shank free of nicks; follow the maker’s instructions for material and maximum speed.
In service, the cutting edge is usually the first part to lose performance. A dull bit may leave burn marks, fuzzy edges, or require more feed pressure. Resin buildup can cause similar symptoms, so clean the cutter with a product intended for router-bit resin and pitch, then inspect it before assuming it needs sharpening. Do not scrape carbide with a hard tool or run a bit with a cracked edge, loose carbide, or damaged shank. Professional sharpening can restore a suitable bit, but repeated sharpening reduces its diameter and can change its profile.
Buying decisions by situation
| Your situation | Practical choice | Why |
|---|---|---|
| Occasional DIY, light grooves | 1/4-in shank, 1/2-in diameter carbide-tipped bit | A useful general size without paying for a large set of specialized cutters |
| Small router or narrow joinery | 1/4-in diameter, short cutting length | Matches narrow cuts and keeps material removal modest |
| Frequent cabinet work | 1/2-in shank, 1/2-in diameter, about 1-in cutting length | A stiffer setup for repeated work, assuming the router accepts that shank |
| Deep groove or thick stock | Choose reach only as needed; route in multiple passes | Limits exposed cutter and reduces heat, deflection, and overload risk |
| Template-cut openings | Use a straight bit with a compatible guide bushing or a suitable pattern bit | The guide system controls the path; the cutter diameter must account for its offset |
Set up for a clean, accurate cut
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Confirm fit and capacity. Match the shank to the collet, check the bit’s cutting length, and verify the router can handle the diameter and material.
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Set the depth in stages. For a deep dado, divide the total depth into several passes rather than removing it all at once. This reduces strain and helps keep the bit from overheating.
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Secure a guide and the work. Clamp both the workpiece and any fence or template. Test the setup on scrap of the same thickness before cutting the final piece.
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Feed steadily and clear chips. Follow the router maker’s feed-direction and speed guidance. Pause between deep passes if needed to clear chips and let the cutter cool; do not stop with the bit buried in the work.
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Inspect after routing. Look for burning, chatter, or a change in cut quality. Clean resin promptly and store bits so carbide edges cannot knock against other tools.
Common questions before buying
Is a straight router bit with a bearing the right choice?
Some straight or pattern bits have a bearing that follows a template or workpiece edge. The bearing guides the path; it does not make the bit a better choice for a dado or groove that needs a straightedge or fence. Check that the bearing diameter and cutter length suit the template thickness and cut.
Can a straight bit cut aluminum?
A standard woodworking straight bit is not the right default for aluminum. Use a cutter specifically rated for the alloy and machine, with the appropriate speed, chip clearance, and workholding. Aluminum can grab or clog a cutter, so follow the tool and cutter manufacturers’ instructions rather than adapting a wood-routing setup.
What does “cut out router bit” mean?
It often refers to a bit used to cut an opening or remove material inside a panel. A straight bit can do this with a secure template or guide and a plunge-capable setup, but the work must be supported and the bit must not be plunged beyond its design. For a long perimeter cut, a jigsaw or another suitable rough-cutting method may be safer and more efficient, followed by template routing for a clean edge.
What router bit should I use to cut plywood?
For a dado or groove, choose a sharp carbide-tipped straight bit sized to the required width, with enough cutting length for the planned depth. For cleaner veneer edges, back up the cut, take a shallow first pass, and avoid forcing the bit. If the plywood is especially prone to splintering, compare straight, spiral, and compression-style cutters based on which faces need the cleanest edge.