The CMT Stop Collar for 1/8" Shanks is a precision accessory designed for use with top bearing router bits, giving woodworkers and CNC operators reliable, repeatable depth control on 1/8" shank bits. With a bore diameter of 3.17mm, this collar seats firmly on the shank to limit bit travel and keep the cutter locked at your target cutting depth - run after run, without drift or slippage. Whether you're routing fine detail work at the drill press, guiding a compact router bit on a CNC routing machine, or setting consistent depths at a router table, this stop collar keeps your setup accurate and your bit safely secured in the collet or chuck.

Key Features

• Designed for top bearing bits - purpose-built compatibility means the collar works with the bit geometry it was engineered for, reducing the risk of improper fit or unwanted movement during cutting passes.
• 3.17mm bore diameter for 1/8" shanks - the precise bore matches 1/8" shank bits closely, so the collar seats snugly without play, giving you consistent depth stops across repeated setups.
• Depth control function - limits bit travel to a predetermined point so you can achieve the same cutting depth on every workpiece without re-measuring or re-setting between passes.
• Prevents bit pullout - the collar acts as a mechanical stop that keeps the bit from being pulled through the collet or chuck under cutting load, protecting both the bit and the workpiece.

Why This Product

• If you rely on 1/8" shank top bearing bits for detail routing or small-diameter drilling operations, this stop collar solves the problem of inconsistent depth from one pass to the next - locking in your setting so every cut matches.
• Bit pullout is a real risk under cutting load, especially with smaller shanks. This collar provides a physical barrier that keeps the bit seated at the correct depth, reducing the chance of ruined workpieces or damaged tooling.
• The 3.17mm bore is sized specifically for 1/8" shanks, making this a direct, no-guesswork fit for routers, drill presses, and CNC routing machines already set up for that shank diameter.
• CMT manufactures this collar under MPN 541.009.00 as an active product, meaning it is a current, supported part - not a discontinued accessory that may be difficult to source or replace.

Specifications

• Manufacturer Part Number: 541.009.00
• Brand: CMT Orange Tools
• Product Type: Stop Collar
• Compatible Shank: 1/8"
• Bore Diameter: 3.17mm
• Compatible Bit Type: Top bearing bits

Approved Applications

• Setting a repeatable cutting depth on routers, drill presses, and CNC routing machines
• Preventing bit pullout through the collet or chuck during routing and drilling operations
• Use with top bearing router bits on 1/8" shanks across woodworking materials