Product Description
CMT Solid Surface Sink and Trim Bits with Insert Knives are purpose-built router bits designed to trim sink cut-outs flush with the bowl when working with solid surface countertop materials such as Corian, Wilsonart, Gibraltar, and similar products. This 3/4 in. diameter, 1/2 in. shank bit set uses an over-hang and flush-trim approach - working in two passes to clean cut-out edges and complete sink installations with professional results. Manufactured from super micrograin carbide, these bits deliver extended cutting life and consistent performance in demanding solid surface routing applications.
Key Features
- Insert knife design with Delrin bearings tapered to match bowl slope - the bearing geometry mirrors the angled side of the sink bowl, ensuring accurate contact and a precise flush-trim result without guesswork or readjustment.
- Two-pass system with over-hang bit and flush-trim bit - the first pass cleans the cut-out edge and leaves a controlled slight over-hang on the underside of the counter, while the second pass completes the operation for a clean, finished edge that requires no additional work.
- Super micrograin carbide construction (HW grade) - tighter carbide grain structure resists wear and edge breakdown, providing guaranteed longer tool life compared to standard carbide bits when cutting solid surface materials.
- 2-tooth (flute) configuration - two insert knives provide a balance of chip clearance and cutting frequency, supporting smooth stock removal in solid surface countertop materials without chipping or tearing.
- 1/2 in. shank diameter - a full 1/2 in. shank provides maximum rigidity in the collet, reducing vibration and deflection during cut-out trimming operations for a cleaner finished result.
- Right-hand rotation - standard RH rotation is compatible with the vast majority of routers and router table setups, making this bit a straightforward drop-in addition to a professional solid surface toolkit.
Why This Product
- Engineered specifically for sink cut-out trimming in solid surface countertops - not a general-purpose bit adapted to the task - so the bearing taper and two-stage process match the actual geometry and workflow of bowl mounting.
- The tapered Delrin bearing follows the slope of the bowl's side, eliminating the guesswork involved in setting bit depth and ensuring the trimmed edge remains consistent around the full perimeter of the cut-out.
- Super micrograin carbide construction extends cutting life, reducing the frequency of insert replacement and keeping projects on schedule when working with abrasive solid surface materials.
- A 3/4 in. cutting diameter and 1 3/16 in. cutting height provide the reach needed to address typical countertop thicknesses in solid surface sink installations, supporting clean results in a single tool setup.
Specifications
- Manufacturer Part Number: 880.561.11
- Brand: CMT Orange Tools
- Diameter: 3/4 in.
- Cutting Height: 1 3/16 in.
- Total Length: 3 9/32 in.
- Shank: 1/2 in.
- Number of Teeth: 2
- Rotation: Right-hand (RH)
- Material: HW (Super Micrograin Carbide)
- Product Type: Solid Surface Sink and Trim Router Bit with Insert Knives
Approved Applications
- Solid surface sink cut-out trimming and flush-trim operations
- Over-hang trimming on solid surface countertop underside edges
- Bowl and sink mounting in solid surface countertop installations
- Flush-trim finishing of sink openings in solid surface countertop work
Frequently Asked Questions
How does the two-pass process work with this bit set?
The first pass uses the over-hang bit to clean the cut-out edge, intentionally leaving a slight over-hang on the underside of the counter. The second pass uses the flush-trim bit to complete the operation, producing a clean, finished edge flush with the sink bowl. This staged approach ensures accuracy and avoids removing too much material in a single pass.
Why are the Delrin bearings tapered on these solid surface bits?
The Delrin bearings are tapered specifically to match the slope of the sink bowl's side wall. This allows the bearing to ride accurately along the angled surface of the bowl, guiding the bit to trim the countertop cut-out at the correct angle and producing a consistent, flush result around the full perimeter.
What type of carbide is used in these insert knives?
These bits are made from super micrograin carbide (HW grade). The tighter grain structure of micrograin carbide resists wear and edge breakdown more effectively than standard carbide, which is why CMT specifies it for guaranteed longer cutting life in solid surface routing applications.
What router shank size is required to use this bit?
This bit requires a router collet that accepts a 1/2 in. shank. It is compatible with handheld routers and router tables equipped with a 1/2 in. collet. The 1/2 in. shank provides added rigidity during trimming operations, which helps minimize vibration and deflection for a cleaner cut.
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