Product Description
CMT Forstner Bit - 1/2" Diameter, 3/8" Shank by CMT is a precision-engineered boring tool designed for drilling clean, flat-bottom holes in softwood. Whether you are installing cabinet hinges, positioning shelf pins, fitting drawer hardware, or cutting oval and arched openings at any angle, this 1/2" bit delivers repeatable accuracy and smooth hole walls. Built from super strength SP steel with a precision-balanced centre point and 2 ground spurs, it is an essential tool for woodworkers and finish carpenters who demand consistent, chip-free results on every bore.
Key Features
- Precision-Balanced Centre Point - keeps the bit accurately on center during plunge entry, giving you repeatable flat-bottom holes with no walking or wandering at the start of each cut.
- 2 Precision-Ground Spurs (V2) - score the wood fiber ahead of the main cutting edges so bore walls emerge clean and chip-free, reducing sanding and cleanup time on finished pieces.
- Standard Rim Design - provides better guidance and lateral stability on small-diameter bores like this 1/2" size, keeping the cut straight and on-target through the full depth of the hole.
- Super Strength SP Steel Construction - delivers durability and edge retention through repeated use in softwood, so cutting edges stay sharp longer between sharpenings.
- 3/8 x 30mm Shank - fits standard 3/8" drill chucks on both drill presses and handheld drills, making the bit versatile across common shop setups without requiring an adapter.
- Right-Hand (RH) Rotation - matches the standard direction of all conventional drill presses and handheld drills, so there is no special setup or reverse-chuck required.
- 90mm (3-35/64") Overall Length - provides adequate reach for typical hinge pocket depths, shelf pin holes, and hardware mounting applications in cabinet and furniture work.
- Flat-Bottom Hole Geometry - unlike twist bits that leave a pointed recess, this Forstner design produces a true flat bottom, which is required for proper hinge cup seating and hardware mounting.
Why This Product
- The right size for hinge and hardware work - the 1/2" cutting diameter is a commonly specified size for shelf pin holes, small hinge cups, and cabinet hardware recesses, so this bit addresses one of the most frequent boring tasks in cabinet and furniture production.
- Chip-free walls without extra setup - the combination of 2 ground spurs and a precision-balanced centre point means clean bore walls are built into the tool's geometry, not dependent on technique alone, reducing rework on visible finished surfaces.
- Versatile angle drilling capability - because Forstner bits are rim-guided rather than flute-guided, this bit can enter a workpiece at an angle to create oval and arched openings, expanding its usefulness beyond straight plunge cuts.
- Proven SP steel durability for softwood applications - super strength SP steel provides the hardness and edge retention needed to bore cleanly through natural softwood repeatedly, making this bit a reliable everyday tool rather than a single-use specialty item.
Specifications
- Manufacturer Part Number: 537.127.31
- Brand: CMT Orange Tools
- Product Type: Forstner Bit
- Diameter: 1/2"
- Total Length: 3-35/64" (90mm)
- Shank: 3/8 x 30mm
- Number of Spurs: 2
- Number of Teeth: 2
- Rim Type: Standard Rim
- Blade Material: Super Strength (SP) Steel
- Rotation: Right-Hand (RH)
Approved Applications
- Drilling precise flat-bottom holes for hinge installation
- Boring shelf pin and cabinet hardware holes
- Creating oval and arched openings at any angle
- Installing cabinet and drawer hardware
- General flat-bottom boring in natural softwood
Frequently Asked Questions
What shank size does this Forstner bit use, and will it fit my drill?
This bit uses a 3/8 x 30mm shank, which fits any drill press or handheld drill equipped with a standard 3/8" chuck. No adapter is needed for most common shop equipment. Right-hand rotation matches all conventional drill setups.
Why does the product data recommend a drill press for larger Forstner bits but also list a handheld drill as compatible?
At the 1/2" diameter with a standard rim, this bit can be used in a handheld drill with care. A drill press is recommended when maximum accuracy and flat-bottom consistency are required. Handheld use is practical for accessible locations where press setup is not feasible, provided the user maintains steady, controlled feed pressure.
Can this bit drill holes at an angle, or only straight down?
Because Forstner bits are guided by their rim rather than by flutes, this 1/2" bit can enter a workpiece at an angle. This makes it suitable for creating oval and arched openings at any angle, as noted in the product features, in addition to standard straight plunge cuts.
What materials is this Forstner bit designed to cut?
This bit is designed for drilling precise flat-bottom holes in natural softwood. The standard rim design and super strength SP steel construction are matched to softwood boring applications. For softwood specifically, the standard rim provides good guidance at the 1/2" diameter without the overheating concerns associated with standard rims at larger diameters (25mm and above), where toothed rims are used instead.
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