Product Description
CMT 812.621.11 Straight Router Bit - Long Series - 12mm Diameter, 1/2 in. Shank is a professional-grade routing tool engineered for deep straight cuts, dadoes, and grooves where standard-length bits cannot reach. Built by CMT with micrograin carbide cutters and a fatigue-proof steel body, this long-series straight bit delivers smooth, precise results even under heavy workloads - making it a reliable choice for cabinetmakers, furniture builders, and woodworking professionals who demand clean edges cut after cut.
Key Features
- Long-Series Design with 1 1/2 in. Cutting Height - reaches deeper into the workpiece than standard-length straight bits, enabling full-depth dadoes, housings, and grooves in a single pass without repositioning.
- Micrograin Carbide Double-Faced Cutters - the dense, fine-grained carbide edge stays sharper longer and handles heavy material removal without chipping, so you get a consistently clean finish on solid hardwood, plywood, MDF, and sheet goods.
- Fatigue-Proof Steel Body - the specially formulated steel shank resists stress fractures under continuous high-load routing, keeping the bit structurally sound during demanding production runs.
- CMT Orange PTFE Non-Stick Coating - the trademark orange surface treatment prevents resin, pitch, and other residue from bonding to the bit, reducing heat buildup and making cleanup faster while extending tool life.
- Exceptional Chip Ejection - the flute geometry is optimized to pull chips up and away from the cut zone, which keeps the cutting edge clear and delivers a cleaner, more consistent result with less burning or tearout.
- 2-Flute Right-Hand Rotation - dual cutting edges balanced for right-hand rotation provide smooth stock removal and reduce vibration, contributing to precise, chatter-free routing on handheld routers, router tables, and CNC setups.
- 1/2 in. Shank - the full 1/2 in. shank provides maximum grip in 1/2 in. collets, reducing runout and improving cut accuracy compared to smaller-shank bits under the same load.
Why This Product
- When a standard straight bit cannot reach the full depth of a dado, housing, or panel joint, this long-series bit with 1 1/2 in. of cutting height bridges that gap - completing deeper cuts cleanly without multiple passes or a secondary tool.
- The combination of micrograin carbide cutters and a fatigue-proof steel body means the bit holds up through heavy production routing rather than dulling quickly, reducing sharpening frequency and downtime between jobs.
- The PTFE non-stick coating actively protects against the resin and pitch accumulation that causes friction and burning - a common problem when routing natural hardwoods, melamine, and laminates - keeping the bit performing like new over more uses.
- With a 12mm cutting diameter and optimized chip ejection, this bit suits a wide range of groove and dado work in solid wood, plywood, MDF, chipboard, and plastic, making it a versatile single-bit solution for many common routing operations.
Specifications
- Manufacturer Part Number: 812.621.11
- Brand: CMT Orange Tools
- Diameter: 12mm
- Cutting Height: 1 1/2 in.
- Total Length: 3 3/4 in.
- Shank: 1/2 in.
- Number of Teeth: 2
- Material: HW (Micrograin Carbide)
- Rotation: Right-Hand (RH)
- Product Type: Straight Bit, Long Series
Approved Applications
- Deep straight cuts requiring extended reach
- Dadoes and grooves in solid wood and sheet goods
- Template routing and pattern work
- Panel joinery and housing joints
- Routing MDF, chipboard, plywood, laminates, melamine, and plastic
Frequently Asked Questions
What is the difference between a long-series straight bit and a standard straight bit?
A long-series bit has a greater cutting height - in this case 1 1/2 in. - compared to standard-length straight bits. This extended reach allows it to cut deeper dadoes, grooves, and housings in a single pass, which is useful when routing thick stock or when full-depth penetration is required that a shorter bit cannot achieve.
Is the 1/2 in. shank compatible with my router?
This bit uses a 1/2 in. shank and is compatible with any handheld router, router table, or CNC routing machine fitted with a 1/2 in. collet. Check your router's collet size before installing - a 1/2 in. collet is required; this bit cannot be used in a 1/4 in. collet without an adapter.
What does the orange PTFE coating on CMT bits actually do?
The orange PTFE non-stick coating on the surface of the bit helps prevent resin, pitch, and other wood residue from adhering to the tool during cutting. This reduces friction and heat buildup, protects against corrosion, and makes it easier to clean the bit after use - all of which contribute to a longer working life for the bit.
What materials can this 12mm straight bit cut cleanly?
The micrograin carbide cutters and optimized chip ejection geometry make this bit suitable for use in solid hardwood, softwood, plywood, MDF, chipboard, laminates, melamine, and plastic. The double-faced cutter design and right-hand rotation help produce clean, smooth edges across all of these materials.
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