Straight Wood Router Bits for CNC — 3.175, 4, 6, 7, 8, 9, 10 mm

Straight wood router bits are carbide-tipped cutting tools built for CNC routers that work solid timber, plywood and MDF. Unlike spiral bits, the cutting edge runs straight along the flute, giving a flat-bottomed cut with very little pull in either direction — useful whenever a clean face matters more than fast chip clearance.

They suit joinery workshops, furniture makers and CNC operators who cut the same panel materials day after day. Choosing the right straight wood router bits depends on the material thickness, the spindle speed available on the machine, and the type of cut — through-cut, groove or rebate — the job requires.

Specifications

Dimensions, data, and technical drawings are provided with reasonable care. Minor variations in length may occur due to production batch, without affecting machining quality.

Features of straight wood router bits

Made from tungsten carbide, these bits hold a sharp edge through long production runs without needing frequent resharpening. The straight cutting geometry pushes chips out to the side rather than pulling the material up or down, which keeps tear-out to a minimum on both faces of the workpiece.

Because the cutting edge sits parallel to the bit’s axis, the finish stays even along the full depth of cut, which matters for slots and flush trims where both surfaces of the panel stay visible. The shank and body are built to handle continuous CNC use without excessive flex.

• Tungsten carbide construction for long edge retention
• Straight flute geometry for clean, tear-out-free cuts
• Suited to solid wood, plywood and MDF
• Built for continuous use on CNC spindles
• Even finish on both faces of the cut

Where it’s used

These bits are common on CNC routers producing cabinet doors, drawer fronts and solid-wood furniture, where straight grooves and rebates need to line up on both sides of the panel. They also suit flat-panel jobs like shelving and MDF carcasses ahead of veneering or edge-banding.

Workshops running regular batches of this kind of cut usually keep several straight wood router bits on hand, each sized to the groove or slot width used most often. Browse the wider CNC tooling range at the CNC router tooling shop to match a bit to your machine and material.

What to check before buying

Shank diameter has to match the collet fitted on your spindle — check this before ordering, since a mismatch is the most common reason a bit sits unused. Flute length and overall length should also clear the material thickness, particularly on thicker MDF or glued-up panels.

Spindle speed matters as much as the bit itself. Running straight wood router bits too fast in dense hardwood can scorch the edges, while too slow a feed rate in soft MDF leaves a fuzzy, uneven finish. Matching feed rate and RPM to the material usually counts for more than the brand stamped on the shank.

Installation and maintenance

Fit the bit fully into the collet, leaving enough shank engaged to avoid vibration, then tighten to the torque the spindle manufacturer recommends. A brief low-speed test run before starting the job is a simple way to catch runout before it shows up in the cut.

Clean resin and wood dust off the flutes after each session, since built-up residue raises cutting temperature and dulls the edge faster than normal wear. For more on how cutting edge geometry affects tool life, the Wikipedia entry on woodworking routers covers the general principles that also apply to CNC tooling.

FAQ

What material are straight wood router bits made from? Almost all are tungsten carbide, sometimes with a coated edge for extra wear resistance in abrasive materials like MDF.

Can straight wood router bits cut MDF and plywood, not just solid wood? Yes — all three are common uses, though feed rate and spindle speed should suit each material’s density and glue content.

How do straight bits differ from spiral bits? A straight edge doesn’t pull chips up or down like a spiral flute, so the cut stays clean and even on both faces of the panel.