Product Description
CMT Precision Collet ER40 - 1/2" (12.7mm) Bore by CMT is a high-accuracy tool-holding collet designed to secure 1/2" shank router bits and CNC tooling with consistent, repeatable grip. Engineered to DIN 6499 standard, this ER40 collet delivers minimal runout and precise clamping performance across CNC routers, machining centers, and point-to-point machines. Whether you are milling hardwood, routing MDF, or machining aluminum, this precision collet provides the stable tool engagement needed for clean, accurate results.
Key Features
- DIN 6499 Precision Ground Construction - machined to the exacting DIN 6499 standard, this collet minimizes runout so your cutting tools stay true at high spindle speeds, protecting both the workpiece and the tooling.
- ER40 System Compatibility - fits the widely adopted ER40 collet chuck format, including CMT chucks 183.201, 183.211, 183.221, and 183.310, as well as most standard tapered spindle noses, giving you broad machine compatibility without adapters.
- 1/2" (12.7mm) Bore Diameter - sized to accept the most common router bit shank diameter used in CNC and production routing, reducing the need for reducer sleeves or intermediate toolholders.
- Replaceable Standard ER40 Collet Design - individual collets can be swapped out independently, so worn or damaged collets are replaced without replacing the entire chuck assembly, lowering long-term tooling costs.
- Wide Compatible Collet Range (3mm to 25mm) - the ER40 system supports collets from 3mm to 25mm bore, meaning this collet family can be expanded to cover a full range of shank sizes as your tooling needs grow.
Why This Product
- If you already run CMT ER40 chucks (183.201, 183.211, 183.221, or 183.310), this collet is the direct factory-matched replacement for 1/2" tooling - no guesswork on fit or compatibility.
- DIN 6499 precision grinding means this collet holds tool runout to tight tolerances, which directly translates to cleaner cuts in hardwood, softwood, plywood, MDF, composite panels, and aluminum.
- The replaceable design of standard ER40 collets allows you to maintain a high-performance toolholding setup over time by replacing only the collet rather than the full chuck - a practical advantage for production and shop environments.
- With ER40 compatibility spanning most tapered spindle noses, this 1/2" collet integrates into CNC routers, machining centers, and point-to-point machines without requiring specialized or proprietary chucks.
Specifications
- Manufacturer Part Number: 184.128.00
- Brand: CMT Orange Tools
- Collet System: ER40
- Bore Diameter: 1/2" (12.7mm)
- Standard: DIN 6499
- Compatible Chucks: CMT 183.201, 183.211, 183.221, 183.310
- Collet Range (System): 3mm to 25mm
- Clamping Tolerance: 0.015mm
- Product Class: Router Cutter - Precision Collet
Approved Applications
- CNC Routing
- Boring
- Milling
- Hardwood machining
- Softwood machining
- MDF and composite panel processing
- Plywood cutting
- Aluminum routing and milling
Frequently Asked Questions
What machines is this ER40 collet compatible with?
This collet is compatible with CNC routers, machining centers, and point-to-point machines equipped with ER40 chucks, including CMT chuck models 183.201, 183.211, 183.221, and 183.310. It also fits most standard tapered spindle noses that accept ER40 collets.
What is the bore diameter of this collet, and does it accept standard 1/2" shank tooling?
Yes. This collet has a bore diameter of 1/2" (12.7mm), which is a standard shank size used across a wide range of CNC router bits and milling tools. No reducer sleeves or adapters are needed for 1/2" shank tooling.
What does the DIN 6499 standard mean for this collet's performance?
DIN 6499 is a precision manufacturing standard that governs the dimensional accuracy and clamping tolerance of ER-type collets. This CMT collet is precision ground to this standard, resulting in a clamping tolerance of 0.015mm, which helps minimize tool runout and maintain cutting accuracy across demanding routing and milling operations.
Can I use this collet with other shank sizes by replacing it within the same ER40 chuck?
Yes. Because this is a replaceable standard ER40 collet, you can swap it out for other ER40 collets ranging from 3mm to 25mm bore diameter within the same compatible chuck body. This allows a single chuck to accommodate a broad range of shank sizes by simply changing the collet.
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