Best 3/8-Inch Cove Router Bits for Edge Profiles and Woodworking
A 3/8-inch-radius cove router bit creates a concave profile on a wood edge or can cut a cove for molding work. The Freud 30-104 is best for routers that take a 1/4-inch shank, while the Freud 30-112 and YONICO 13154 suit setups with a 1/2-inch collet. For varied groove sizes, the Newdeli set includes eight cutting diameters, including 3/8 inch.
| Product | Best For | Shank |
|---|---|---|
| Freud 30-104 | Single-profile edge work | 1/4 inch |
| YONICO 13154q | Small moldings and cove edges | 1/4 inch |
| Freud 30-112 | 1/2-inch collet routers | 1/2 inch |
| Newdeli 8-piece set | Multiple groove diameters | 1/4 inch |
| YONICO 13154 | 1/2-inch shank cove work | 1/2 inch |
Freud 30-104 3/8-Inch Cove Bit
The Freud 30-104 is a single cove bit with a 3/8-inch radius and a 1/4-inch shank. Its listed specifications include a 1-1/4-inch overall diameter, 2-3/16-inch overall length, two cutters, and a 1/2-inch bearing diameter. Freud describes it as a classic profile for furniture and millwork edges, with a shear angle intended to produce clean cuts without tearout.
Best for: Woodworkers whose router accepts a 1/4-inch shank and who need one standard cove profile. It was selected for its clearly specified dimensions and furniture-and-millwork use. Limitation: It is not the right choice for a router setup that requires a 1/2-inch shank.
YONICO 13154q 3/8-Inch Cove Bit
This YONICO edge-forming bit has a 3/8-inch radius, 3/8-inch cutting depth, 1/2-inch cutting height, and 1/4-inch shank. Its C3 micro-grain tungsten carbide blades are described as designed for a sharp, longer-lasting cutting edge. The bit can add a cove to surface edges or make small molding components for use alone or in a molding build-up.
Best for: Projects that call for a 1/4-inch-shank bit for either edge shaping or small molding work. It was selected because its listed uses cover more than one cove application. Limitation: Choose another option if your router requires a 1/2-inch shank.
Freud 30-112 3/8-Inch Cove Bit
The Freud 30-112 has the same listed 3/8-inch radius as the Freud 30-104 but uses a 1/2-inch shank. Its specifications include a 1-1/4-inch overall diameter, 2-1/2-inch overall length, two cutters, and a 1/2-inch bearing diameter. It is described for furniture and millwork edges, and its shear angle is intended to support clean cuts without tearout.
Best for: Buyers who want the Freud cove profile but need a 1/2-inch shank. The matching radius makes it a direct shank-size alternative to the 30-104. Limitation: Its larger shank will not fit a collet designed only for 1/4-inch bits.
Newdeli Eight-Piece Cove Bit Set
This 1/4-inch-shank set includes cutting diameters of 1/4, 5/16, 3/8, 1/2, 5/8, 3/4, 7/8, and 1 inch. The product information describes tungsten steel alloy construction and use for grooving solid wood, particle board, plywood, MDF, and other wood composites. It is listed for router machines, table-mounted portable routers, and CNC router machines.
Best for: Woodworkers who need several groove diameters rather than one dedicated edge profile. It was selected because the set includes a 3/8-inch option alongside seven other sizes. Limitation: The manufacturer says to avoid ferrous metals and other non-wood materials; confirm the specific bit size before cutting to reduce unwanted material waste.
YONICO 13154 3/8-Inch Cove Bit
The YONICO 13154 has a 3/8-inch radius, 3/8-inch cutting depth, 1/2-inch cutting height, and 1/2-inch shank. Its C3 micro-grain tungsten carbide blades are described as designed for a sharper, longer-lasting edge. Like the 1/4-inch-shank YONICO option, it is intended for cove edges and small molding work, including molding build-ups.
Best for: Buyers who want YONICO’s stated edge-forming and molding uses with a 1/2-inch shank. It was selected as the larger-shank counterpart to the 13154q. Limitation: Check the router collet before buying; this bit requires a 1/2-inch shank capacity.
Buying Guide: Choosing A 3/8-Inch Cove Router Bit
Which shank size fits your router?
Start by matching the bit shank to the router’s collet. The Freud 30-104 and YONICO 13154q have 1/4-inch shanks. The Freud 30-112 and YONICO 13154 use 1/2-inch shanks. The Newdeli set also has 1/4-inch shanks. Do not choose based on the cove radius alone: the shank must match the equipment.
Do you need an edge profile or a groove?
Freud and YONICO describe their individual bits for shaping cove edges, furniture details, or small molding parts. The Newdeli set is described for grooving and offers multiple cutting diameters. Compare the intended cut and the specified dimensions, since a 3/8-inch radius and a 3/8-inch cutting depth describe different measurements.
Would a single bit or a set be more useful?
Choose an individual bit if the project calls for one specific profile and you know the required shank size. A multi-size set is more suitable when the work includes different groove widths. The Newdeli set lists eight diameters, but its stated shank size is 1/4 inch, so it is not a substitute for a 1/2-inch-shank bit.
Frequently Asked Questions
What does 3/8-inch radius mean on a cove bit?
It identifies the radius of the cove profile the bit is designed to cut. It is not necessarily the same as the cutting depth or the diameter of the bit.
Can a 1/4-inch-shank bit fit a 1/2-inch collet?
These product listings specify distinct shank sizes. Check the router and collet instructions rather than assuming the sizes are interchangeable.
Which listed bit has a 1/2-inch shank?
The Freud 30-112 and YONICO 13154 are listed with 1/2-inch shanks.
Which option includes a 3/8-inch cutting diameter?
The Newdeli eight-piece set lists a 3/8-inch cutting diameter among its eight sizes.