Product Description
CMT 184.202.00 ER40 Precision Collet - 20mm Diameter by CMT is a high-accuracy tool-holding collet engineered to DIN 6499 standards, designed for use with ER40 chuck systems in CNC routers, machining centers, and point-to-point machines. Whether you are securing router bits, milling cutters, or boring tools in a production CNC environment, this 20mm bore collet delivers the precise, repeatable clamping performance that demanding machining applications require. The ER40 collet system is one of the most widely adopted tool-holding standards in the industry, and this precision-ground collet is built to fit right into that ecosystem with minimal runout and dependable grip.
Key Features
- DIN 6499 precision ground construction - machined to meet the exacting DIN 6499 specification, this collet delivers minimal runout so your router bits and CNC tools stay accurately centered, protecting both the workpiece surface quality and tool life.
- ER40 collet system compatibility - fits the widely used ER40 standard, meaning it is interchangeable with most ER40 tapered spindle noses and chuck bodies, giving you broad machine compatibility without the need for adapters.
- 20mm bore diameter - precisely sized to grip 20mm shank tooling securely, eliminating tool slippage during high-feed milling, routing, and boring operations.
- Compatible with CMT chuck series 183.201, 183.211, 183.221, and 183.310 - designed as a direct replacement collet for these specific CMT ER40 chucks, making it a reliable spare or upgrade for existing CMT tooling setups.
- Replaceable standard ER40 collet design - because it follows the standard ER40 form factor, this collet can be swapped out quickly when worn, reducing downtime and keeping your machine running at peak accuracy.
- Broad shank range coverage (3mm to 25mm) - the ER40 collet family spans 3mm to 25mm shank diameters, so this 20mm collet fits naturally into a complete set that covers virtually all common CNC tooling shank sizes.
Why This Product
- If you run an ER40 chuck on a CNC router or machining center and need a precision collet for 20mm shank tooling, this CMT collet offers a DIN 6499-compliant solution that fits directly without modification - no adapters, no guesswork.
- For shops that already use CMT chuck bodies in the 183.201, 183.211, 183.221, or 183.310 series, this collet is the manufacturer-matched replacement, ensuring the fit and clamping performance the chuck was designed to deliver.
- The ER40 standard collet form factor means this collet is not proprietary - it also fits most other ER40-compatible tapered spindle noses, giving it versatility across mixed-brand machine environments.
- Because this is a replaceable collet rather than an integrated chuck, you can refresh your tool-holding accuracy at a fraction of the cost of replacing the entire chuck assembly - an economical choice for maintaining tight tolerances over time.
Specifications
- Manufacturer Part Number: 184.202.00
- Brand: CMT Orange Tools
- Collet System: ER40
- Bore Diameter: 20mm
- Standard: DIN 6499
- Compatible Chucks: CMT 183.201, 183.211, 183.221, 183.310
- Shank Range (ER40 series): 3mm to 25mm
- Clamping Tolerance: 0.015mm
Approved Applications
- CNC Routing
- Milling
- Boring
Frequently Asked Questions
Which chuck bodies is the CMT 184.202.00 designed to work with?
This ER40 precision collet is designed for use with CMT chuck models 183.201, 183.211, 183.221, and 183.310. It also fits most other ER40-compatible tapered spindle noses that accept standard DIN 6499 ER40 collets.
What is the bore diameter of this collet, and what shank sizes does the ER40 system cover overall?
This specific collet has a 20mm bore diameter, sized to grip 20mm shank tools. The ER40 collet system as a whole covers shank diameters from 3mm to 25mm, so a full set of ER40 collets can accommodate virtually all common CNC tooling shank sizes.
What does DIN 6499 compliance mean for machining performance?
DIN 6499 is an internationally recognized precision standard for ER-type collets. Compliance means the collet has been precision ground to tight dimensional tolerances - in this case a clamping tolerance of 0.015mm - resulting in minimal runout and accurate, repeatable tool positioning during CNC routing, milling, and boring operations.
What types of machines can use this ER40 collet?
This collet is suited for use in CNC routers, machining centers, and point-to-point machines equipped with an ER40 chuck and a compatible tapered spindle nose. It supports applications including CNC routing, milling, and boring across a range of workpiece materials.
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