Product Description
CMT Weatherseal Bit - 9/64" Diameter, 1/4" Shank is a precision router bit engineered specifically for cutting weatherseal grooves in door and window frames. Manufactured from solid tungsten carbide, this 2-flute bit gives woodworkers and contractors a reliable solution for improving home energy efficiency by re-grooving frames to accept wind-blocking insulation inserts. Whether used in a handheld router, router table, or CNC routing machine, this bit delivers consistent groove depth and clean edges in a wide range of materials.
Key Features
- Solid tungsten carbide construction (HWM material grade) - provides exceptional hardness and wear resistance so the bit maintains a sharp cutting edge through repeated use in hardwood, softwood, MDF, plywood, and composite panels.
- 9/64" cutting diameter with 5/16" cutting height - sized precisely for weatherseal insert grooves, allowing the bit to reach up to 12mm in depth without risk of breakage or deflection.
- 1/4" shank diameter - fits the most common router collet size, making this bit compatible with a broad range of handheld routers and router tables without requiring adapters.
- 2-flute right-hand rotation design - twin cutting edges produce a smooth, consistent groove profile that minimizes tearout and delivers a clean channel ready to accept weatherseal inserts directly.
- 3" total length - provides sufficient reach and clearance for routing grooves in door and window frame profiles without the router body interfering with surrounding trim.
Why This Product
- Designed specifically for weatherseal groove routing - this is not a general-purpose bit adapted for the task. The 9/64" diameter matches standard wind-blocking insert dimensions, so you get a snug, functional fit the first time.
- Solid tungsten carbide construction means the bit can handle repeated use across multiple door and window frames without dulling prematurely - a practical advantage on whole-home weatherization projects.
- The 1/4" shank makes this bit immediately usable with the most widely owned router collet size, eliminating the need for special tooling or collet reducers before starting a job.
- At 3" total length with a 5/16" cutting height, the bit offers enough working depth to cleanly re-groove existing frames where the original seal channel has worn or closed over time.
Specifications
- Manufacturer Part Number: 813.001.11
- Brand: CMT Orange Tools
- Diameter: 9/64"
- Cutting Height: 5/16"
- Total Length: 3"
- Shank: 1/4"
- Number of Teeth: 2
- Blade Material: Solid Tungsten Carbide (HWM)
- Rotation: Right-Hand (RH)
Approved Applications
- Weatherseal groove routing in door frames
- Weatherseal groove routing in window frames
- Re-grooving existing frames to accommodate wind-blocking insulation inserts
- Screw slot routing in doors, windows, and panels
Frequently Asked Questions
What is a weatherseal bit used for?
A weatherseal bit is used to cut or re-cut narrow grooves in door and window frames that hold wind-blocking weatherseal inserts. Replacing or refreshing these inserts is one of the most effective ways to improve a home's energy efficiency by reducing drafts and air infiltration around older doors and windows.
What router collet size is required for this bit?
This bit has a 1/4" shank diameter, which fits any router equipped with a 1/4" collet. This is the most common collet size found on handheld routers and many router tables, making the bit broadly compatible without adapters.
What materials can this weatherseal bit cut through?
Because it is made from solid tungsten carbide, this bit is capable of routing grooves in solid hardwood, softwood, plywood, MDF, chipboard, laminates, melamine, and plastic - covering virtually all common door and window frame materials encountered in residential and light commercial settings.
Can this bit be used on a CNC routing machine?
Yes. The 1/4" shank and solid tungsten carbide construction make this bit suitable for use in handheld routers, router tables, and CNC routing machines alike. The right-hand rotation matches the standard spindle direction used in all of these platforms.
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