Product Description
CMT Forstner Bit - 40mm Diameter, 10mm Shank is a precision boring tool engineered for drilling clean, flat-bottom holes in softwood. Built from super strength SP steel, this right-hand rotation bit delivers long-lasting cutting performance in drill press and handheld drill applications. Whether you are installing cabinet hinges, shelf pins, or brackets, or cutting arched and oval openings at any angle, this 40mm flat-bottom drill bit gives you the control and edge retention needed for repeatable, professional results.
Key Features
- Super Strength SP Steel Construction - the blade material resists wear over repeated use, meaning fewer sharpenings and longer service life when boring softwood.
- 2 Precision-Ground Spurs - spurs score the wood fibers ahead of the main cutting edges, producing clean, chip-free bore walls and reducing tearout on entry.
- 2 Precision-Ground Cutting Edges - dual cutting edges balance cutting forces across the bit, helping maintain center and producing smooth, flat-bottomed recesses.
- Toothed Rim Design at 40mm Diameter - the toothed rim on this larger-diameter bit prevents overheating during extended cuts, protecting both the bit and the workpiece surface.
- Right-Hand Rotation - standard RH rotation is compatible with all common drill presses and handheld drills, requiring no special setup or adapters.
- 10x30mm Shank - the 10mm shank seats securely in standard drill chucks, providing the grip and stability needed for accurate plunge cuts without slipping.
- Flat-Bottom Hole Geometry - unlike twist drills that leave a conical floor, this Forstner bit cuts a true flat bottom, which is essential for hardware installation and joinery recesses.
Why This Product
- Engineered for precise hinge and hardware installation - the flat-bottom cutting geometry creates the clean, accurate recesses needed when fitting cabinet hinges, shelf pins, brackets, and mounting straps where a conical drill hole would fail to seat hardware properly.
- Handles angled and overlapping holes that standard bits cannot - Forstner bit design allows drilling at any angle and cutting partial holes at workpiece edges, making it the right choice for arched openings, oval cutouts, and niche recesses in softwood panels.
- SP steel durability reduces downtime - super strength steel holds a sharp edge longer than standard carbon steel alternatives, meaning you stay productive through more holes before needing to resharpen or replace the bit.
- One bit handles multiple tasks - from creating frame and grid niches to boring shelf-pin holes and hinge recesses, this 40mm bit covers a range of cabinet and millwork drilling applications with a single tool.
Specifications
- Manufacturer Part Number: 537.400.31
- Brand: CMT Orange Tools
- Product Type: Forstner Bit
- Diameter: 40mm
- Total Length: 3-35/64"
- Shank: 10x30mm
- Number of Cutting Edges: 2
- Number of Spurs: 2
- Blade Material: Super Strength (SP) Steel
- Rotation: Right-Hand (RH)
Approved Applications
- Drilling precise flat-bottom holes in softwood
- Hinge installation and cabinet hardware recesses
- Shelf pin and bracket/strap installation
- Creating oval and arched openings at any angle
- Cutting niches for frames, grids, and mounting hardware
Frequently Asked Questions
What materials is this Forstner bit rated for?
The CMT 537.400.31 is designed for use in natural softwood. The super strength SP steel construction provides long-lasting cutting performance in softwood applications.
Can this bit drill holes at an angle or along a workpiece edge?
Yes. Forstner bit geometry allows drilling at any angle and cutting partial or overlapping holes at the edge of a workpiece - capabilities that standard twist drills and spade bits cannot match. This makes the bit well suited for creating arched openings and oval cutouts.
What shank size does this bit use, and what drill chucks will it fit?
The bit uses a 10x30mm shank. A 10mm shank seats securely in standard keyed and keyless drill chucks on both drill presses and handheld drills capable of accepting a 10mm shank diameter.
Why does a Forstner bit produce a better result than a twist drill for hinge installation?
A Forstner bit cuts a true flat-bottom hole, which is required for cabinet hinges, shelf pins, and surface-mounted hardware to seat flush and function correctly. A twist drill leaves a conical point at the bottom of the hole that prevents hardware from lying flat, making Forstner bits the standard choice for these joinery and hardware installation tasks.
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