Product Description
CMT ER40 Precision Collet - 3/8" (9.5mm) Diameter is a high-accuracy tool-holding collet engineered to DIN 6499 standards, designed for use with ER40 chuck systems on CNC routers, machining centers, and point-to-point machines. Built for professionals who demand tight tolerances and repeatable tool positioning, this collet accepts a 3/8" shank diameter and is part of CMT's replaceable standard ER40 collet series, which covers a clamping range from 3mm to 25mm to fit most tapered spindle noses.
Key Features
- DIN 6499 precision ground construction - meets the internationally recognized standard for ER collets, delivering minimal runout and consistent tool accuracy across demanding machining operations
- ER40 collet system compatibility - fits CMT chucks 183.201, 183.211, 183.221, and 183.310, as well as most tapered spindle noses, making it a versatile upgrade or replacement in existing setups
- 3/8" (9.5mm) bore diameter - precisely sized at 9.52mm to securely grip 3/8" shank router bits and CNC tooling with no slippage during high-speed cutting passes
- Replaceable standard ER40 format - allows individual collets to be swapped out as needed without replacing the entire chuck assembly, reducing downtime and tooling costs
- Broad clamping range (3mm to 25mm) within the ER40 family - when combined with other collets in the CMT ER40 series, the full chuck system accommodates a wide variety of shank sizes for routing, milling, and boring applications
Why This Product
- Engineered to DIN 6499 tolerances, this collet is the right choice for CNC routing and machining center applications where tool runout directly affects cut quality and surface finish on hardwood, softwood, MDF, plywood, composite, and aluminum workpieces.
- As a standard ER40 replaceable collet, it provides a cost-effective solution for maintaining tool-holding accuracy over time - simply replace the worn collet rather than the full chuck unit.
- The 3/8" bore size is one of the most commonly used shank diameters in CNC tooling, making this collet a practical everyday workhorse for production shops running mixed material applications.
- Compatibility with CMT chucks 183.201, 183.211, 183.221, and 183.310 means this collet integrates directly into established CMT spindle systems without adapters or modifications.
Specifications
- Model Number: 184.096.00
- Brand: CMT Orange Tools
- Collet System: ER40
- Standard: DIN 6499
- Bore Diameter: 9.52mm (3/8")
- Compatible Chucks: 183.201, 183.211, 183.221, 183.310
- Clamping Range (ER40 Series): 3mm to 25mm
Approved Applications
- CNC Routing
- Boring
- Milling
- Use with CNC Routers, Machining Centers, and Point-to-Point Machines
Frequently Asked Questions
Which CMT chucks is this ER40 collet compatible with?
This collet is designed for use with CMT chucks 183.201, 183.211, 183.221, and 183.310. It also fits most other tapered spindle noses that accept standard ER40 collets.
What is the bore diameter of this collet, and will it fit a 3/8" shank tool?
The bore diameter is 9.52mm, which corresponds to a 3/8" shank. This collet is specifically sized to grip 3/8" shank router bits and CNC tooling securely within an ER40 chuck body.
What does DIN 6499 mean and why does it matter for my tooling setup?
DIN 6499 is an international precision standard for ER-type collets. A collet manufactured to this standard is precision ground to tight dimensional tolerances, which minimizes tool runout and helps maintain consistent cut accuracy - important for CNC routing, milling, and boring in materials such as hardwood, MDF, plywood, aluminum, and composites.
Can this collet be used as a replacement for a worn collet in an existing ER40 system?
Yes. The CMT ER40 collet series is designed as a replaceable standard format. Individual collets can be swapped out when worn or damaged without replacing the chuck assembly. The ER40 series covers a range from 3mm to 25mm, so multiple bore sizes are available to suit different tooling needs.
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