Carbitool
2 Flute Beading Bit Wide Flat Bottom — Carbide Tipped, 5/8″ Cutting Diameter, 1/4″ Shank
Part No: TBB 8 | Barcode: 9314350004696 | Product Group: R603
A 2-flute carbide-tipped beading bit with a wide flat bottom specially designed for grooving panel doors. Produces a beading groove with a 1/4″ radius and a distinctive wide, flat floor that adds depth and shadow to decorative door panel profiles.
2 Flute
Carbide Tipped
5/8″ Cutting Dia.
1/4″ Shank
Wide Flat Bottom
Panel Door Profile
Suitable For
Panel Doors
Cabinet Faces
Hardwood
Softwood
MDF
Key Features & Benefits
- Wide flat bottom profile — produces a beading groove with a broad, flat floor rather than a pure radius, creating more pronounced shadow lines on panel door faces.
- Panel door specialist — profile geometry is engineered for the repeatable groove routing required in cabinet and furniture production.
- 2-flute carbide-tipped construction — delivers clean, smooth groove walls in hardwood, softwood, and MDF without burning.
- Use with fence or template — no bearing guide; run against a router fence for face forming or use with a template for curved work.
When to Use This Bit
Use the TBB 8 when routing decorative bead grooves into flat panel door faces, cabinet stile faces, or furniture drawer fronts where a wide, flat-bottomed groove profile is required. Best used in a router table with a fence for straight-line production work. The 1/4″ shank suits smaller handheld routers and trim routers; for heavier production use, select the TBB 8 1/2 (1/2″ shank). For a narrower bead, see TBB 4 and TBB 4 1/2.
Product Specifications
| Part No. | A (Cutting Dia.) inch | A mm | B (Cut Length) inch | B mm | C (Overall Length) inch | C mm | R Radius inch | R mm | Shank inch | Shank mm | Barcode |
|---|---|---|---|---|---|---|---|---|---|---|---|
| TBB 4 | 3/4 | 19.05 | 7/16 | 11.11 | 1-3/4 | 44.45 | 1/8 | 3.18 | 1/4 | 6.35 | 9314350004719 |
| TBB 4 1/2 | 3/4 | 19.05 | 7/16 | 11.11 | 2-1/4 | 57.15 | 1/8 | 3.18 | 1/2 | 12.70 | 9314350004726 |
| TBB 8 ★ | 1 | 25.40 | 3/4 | 19.05 | 2 | 50.80 | 1/4 | 6.35 | 1/4 | 6.35 | 9314350004733 |
| TBB 8 1/2 | 1 | 25.40 | 3/4 | 19.05 | — | 64.00 | 1/4 | 6.35 | 1/2 | 12.70 | 9314350004740 |
★ You are viewing the highlighted variant. Other sizes in this series are also available.
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