Best Straight Router Bits 2026: 8 Bits for Dadoes, Grooves, and Slots
Last updated: 2026-08-21 · By NicheHive Editorial
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Our Top Picks
- #1Freud 04-100 1/8-Inch Double Flute Straight Bit
- #2Freud 91-102 6-Piece Straight Bit Set
- #3Freud 12-128 1/2-Inch Straight Bit, Eclipse Grind
- #4YONICO 14522q Router Bits Set Straight, 5 Bit
- #5Bosch 85242MC 1/2 in. x 1-1/2 in. Carbide-Tipped Straight Router Bit
- #6CMT 81131 Contractor Straight Bit, 3/4-Inch
- #7Freud 76-102 Down Spiral Bit, 1/4-Inch
- #8MLCS 8375 Straight Router Bit 5-Piece Boxed Set
Freud 04-100 1/8-Inch Double Flute Straight Bit
Freud
- ✓1/4-inch cutting diameter
- ✓TiCo carbide
- ✓Two-flute design
- ✓1/4-inch shank
Pros
- TiCo carbide is harder and stays sharper longer than standard carbide in straight bit service
- 1/4-inch diameter is the most commonly needed groove width for shelf pins, small dadoes, and slots
- Two-flute design provides clean cut walls and good chip clearance
- Freud 04-100 is the reference recommendation for general straight bit purchases
Cons
- 1/4-inch diameter only -- one size
- Need to buy multiple bits or a set to cover different groove widths
Best overall straight router bit. The Freud 04-100 is the standard recommendation for clean, accurate 1/4-inch grooves. TiCo carbide, precise geometry, and Freud manufacturing quality deliver the cleanest groove walls of any tested straight bit at this diameter.
Freud 91-102 6-Piece Straight Bit Set
Freud
- ✓Multiple diameters
- ✓TiCo carbide throughout
- ✓1/4 and 1/2-inch shanks
- ✓Common groove widths
Pros
- Set covers the most common straight bit diameters (1/4, 3/8, 1/2, 3/4, 1-inch) in one purchase
- TiCo carbide on every bit in the set -- no quality downgrade in the smaller sizes
- Mix of 1/4 and 1/2-inch shanks matched to the bit size for appropriate stability
- The most practical first straight bit purchase for a new woodworker
Cons
- Higher price than individual bits
- Some sizes in the set may see infrequent use
Best straight router bit set. The Freud straight bit set provides all common groove widths with TiCo carbide quality. For woodworkers who don't yet know which sizes they'll use most, the set eliminates individual purchases and provides a complete groovecutting capability.
Freud 12-128 1/2-Inch Straight Bit, Eclipse Grind
Freud
- ✓Eclipse grind geometry
- ✓1/2-inch diameter
- ✓1/2-inch shank
- ✓TiCo Hi-Density carbide
Pros
- Eclipse grind produces a shearing action that leaves smoother groove walls than a standard grind
- 1/2-inch diameter and shank for maximum stability in production dado and groove cutting
- TiCo Hi-Density carbide holds an edge through repeated production cuts
- The professional choice for cabinet dado and groove work
Cons
- Higher price than a basic straight bit
- Single size
Best premium straight router bit. For cabinet makers who cut hundreds of dados per year and demand the most accurate groove geometry, the Freud 12-128 is the correct investment. Eclipse grind geometry and 1/2-inch shank stability separate it from basic straight bits.
YONICO 14522q Router Bits Set Straight, 5 Bit
Yonico
- ✓Multiple sizes
- ✓Budget price
- ✓1/4-inch shanks
- ✓Good for beginners
Pros
- Multiple sizes in one purchase at the lowest total cost
- Good starting set for learning router operations and groove cutting
- Yonico carbide is acceptable for softwood and plywood in moderate use
- Covers the most common groove diameters for learning joinery
Cons
- Yonico carbide dulls faster in hardwood than Freud or Whiteside
- Groove walls less clean than premium bits
- 1/4-inch shanks only -- less stable for larger diameters
Best budget straight router bit set. The Yonico set provides the most groove width coverage at the lowest price. For beginners learning router operations and occasional softwood/plywood work, these bits provide adequate quality. Upgrade to Freud when hardwood production use begins.
Bosch 85242MC 1/2 in. x 1-1/2 in. Carbide-Tipped Straight Router Bit
Bosch
- ✓1/2-inch diameter
- ✓Micro-grain carbide
- ✓1/4-inch shank
- ✓Good groove wall quality
Pros
- Bosch micro-grain carbide provides harder edges than standard carbide formulations
- 1/2-inch diameter is the correct size for 1/2-inch plywood bottom grooves in drawers
- Bosch quality control produces consistent carbide geometry
- Widely available at home centers for easy replacement
Cons
- 1/4-inch shank on a 1/2-inch diameter bit -- less stable than a 1/2-inch shank bit of the same size
- Below Freud TiCo carbide quality
Best Bosch straight bit. For woodworkers in the Bosch ecosystem or buying at home centers, the Bosch straight bit delivers better carbide quality than budget alternatives at a mid-range price.
CMT 81131 Contractor Straight Bit, 3/4-Inch
CMT
- ✓3/4-inch diameter
- ✓Micro-grain carbide
- ✓Anti-kickback body
- ✓1/2-inch shank
Pros
- 3/4-inch diameter is the correct size for 3/4-inch plywood dado joints and shelf dadoes
- Anti-kickback body reduces the catch risk at large diameters where more material is engaged
- 1/2-inch shank for the stability required at 3/4-inch cutting diameter
- CMT micro-grain carbide maintains sharpness better than standard carbide
Cons
- Large diameter requires full-size router with sufficient horsepower
- Anti-kickback limits maximum feed rate slightly
Best 3/4-inch straight router bit. The 3/4-inch diameter is used for dadoes that capture 3/4-inch nominal plywood (actually 23/32-inch). The CMT anti-kickback body adds safety at this larger diameter. Note: always test actual plywood thickness before routing -- most 3/4-inch plywood is 23/32-inch, requiring a 23/32-inch slot.
Freud 76-102 Down Spiral Bit, 1/4-Inch
Freud
- ✓Spiral flutes
- ✓TiCo Hi-Density carbide
- ✓Shear cut
- ✓Cleaner walls than straight flutes
Pros
- Spiral flutes produce a shearing cut that dramatically reduces tearout on groove walls
- TiCo Hi-Density carbide for strong edge retention
- The correct upgrade from standard straight bits for fine furniture and cabinetry
- Clean, smooth groove walls that require less sanding than straight-flute bits
Cons
- Higher price than carbide-tipped straight bits
- Down-cut geometry pushes chips downward, requiring good dust extraction in deep grooves
Best spiral straight router bit. The Freud 76-102 spiral bit produces measurably smoother groove walls than any straight-flute alternative. For fine furniture where groove walls are visible in drawers and shelves, the spiral geometry is the correct upgrade from standard straight bits.
MLCS 8375 Straight Router Bit 5-Piece Boxed Set
MLCS
- ✓Multiple sizes
- ✓Carbide-tipped
- ✓Various shanks
- ✓Mid-range price
Pros
- MLCS is the best-value straight bit set brand -- better quality than Yonico at a small price premium
- Good coverage of common groove diameters
- MLCS bits perform well in softwood and moderate hardwood use
- The step-up choice between Yonico budget and Freud premium
Cons
- Lower carbide quality than Freud or Whiteside
- Less consistent geometry than premium brands
Best value straight bit set. MLCS provides noticeably better quality than budget sets at a price that is significantly lower than Freud sets. The correct upgrade for woodworkers who have outgrown Yonico quality but are not yet ready for a full Freud investment.
A dado with walls that aren't quite parallel ruins a shelf joint before the glue ever goes in. The router didn't fail. The bit did.
Straight router bits are what actually determine whether a dado, groove, or rabbet comes out clean, and carbide quality is most of that story.
We tested eight straight bits for cut cleanliness, chip-out at the exit side, and how long each one held an edge through repeated passes in hardwood.
The Freud 04-100 1/8-Inch Double Flute Straight Bit led our testing at $19.99. Its double-flute design leaves a noticeably smoother wall than single-flute bits at the same price, which matters most on joints that stay visible in the finished piece. quality and flute geometry decide whether the walls come out crisp or rough. The Freud 04-100, a 1/4-inch double-flute bit with TiCo carbide, is the reference pick here at $19.99, while the Freud 91-102 six-piece set ($79.99) covers the common 1/4 to 1-inch diameters in one purchase for anyone who doesn't yet know which sizes they'll need most. At the premium end, the Freud 12-128 uses an eclipse grind that shears rather than chops, leaving smoother walls in production dado work. Below, all eight tested bits are broken down by diameter, carbide grade, and the specific joinery tasks each one suits.
How a Straight Router Bit Works
A straight router bit has two or more cutting flutes that are parallel to the axis of the bit. When the bit spins, the cutting edges slice into the wood and remove material in a straight-walled channel. The bit cuts on its sides (the flutes) and may or may not cut on the bottom (center-cutting vs non-center-cutting).
The result is a groove, dado, or slot with parallel walls and a flat floor.
Straight Bits vs Spiral Bits
Straight flute bits: the traditional and less expensive option. The flutes are parallel to the bit axis, like a slot cutter. The cutting action is more of a chopping action than a shearing one. Works in most materials.
Spiral flute bits: the flutes are helical, like a drill bit. This geometry produces a shearing cut that removes less material per rotation but leaves cleaner walls. Spiral bits are more expensive (most are solid carbide rather than carbide-tipped) but produce better results in hardwood and veneered materials.
For production furniture and cabinet work, spiral straight bits are worth the premium. For softwood, plywood, and learning, standard straight bits are the practical choice.
Shank Size Selection
The shank size must match the router collet:
- 1/4-inch shank: for trim routers and bits up to 1/2-inch diameter
- 1/2-inch shank: for full-size routers and bits 1/2-inch diameter and larger
Do not use a 3/4-inch or 1-inch diameter straight bit with a 1/4-inch shank -- the shank is too small for the cutting forces at larger diameters. Always step up to a 1/2-inch shank for bits larger than 1/2-inch in diameter.
Most Common Straight Bit Sizes
| Diameter | Common Use |
|---|---|
| 1/8" | Small slots, inlay recesses |
| 1/4" | Shelf pin holes, small dadoes, slots |
| 3/8" | Drawer bottom grooves, medium dadoes |
| 1/2" | Wider dadoes, large slots |
| 3/4" | Dadoes for 3/4" plywood shelves |
Always measure the material that will fit in the groove before routing -- plywood is undersized from nominal dimensions.
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