Product Description
CMT Precision Collet ER40 - 1/4 in. (6.35mm) is a high-accuracy ER40 collet machined to DIN 6499 standards, designed to hold 1/4 in. shank router bits and CNC tooling with exceptional grip and minimal runout. Built as a replaceable standard ER40 collet, it fits a broad range of tapered spindle noses and is compatible with CMT chucks including the 183.201, 183.211, 183.221, and 183.310 - making it a reliable choice for CNC routing, milling, and precision machining operations across wood, composite, and non-ferrous materials.
Key Features
- DIN 6499 precision ground collet - machined to the internationally recognized DIN 6499 standard, delivering minimal runout so your bits cut true and your finished surfaces stay accurate.
- ER40 collet system - one of the most widely used and interchangeable collet formats available, so this collet slots into most ER40-compatible chucks and tapered spindle noses without adaptation.
- 1/4 in. (6.35mm) bore diameter - sized to securely grip standard 1/4 in. shank tooling, eliminating slippage during demanding CNC routing and milling passes.
- Replaceable standard design - collets wear over time, and this unit is designed as a direct drop-in replacement, letting you restore chuck performance without replacing the entire assembly.
- Compatible with CMT chucks 183.201, 183.211, 183.221, and 183.310 - confirmed fit across multiple CMT tool holding systems means no guesswork when specifying a replacement or spare collet.
- Fits most tapered spindle noses - broad compatibility across CNC routers, machining centers, and point-to-point machines means fewer dedicated accessories to stock.
Why This Product
- When a worn or out-of-spec collet causes bit vibration or surface defects, replacing it with a DIN 6499 precision-ground ER40 collet restores the tight tolerances your CNC router or machining center requires - without replacing the chuck body.
- The ER40 format covers shank sizes from 3mm to 25mm, making this collet system a practical long-term investment for shops that run diverse tooling on a single spindle.
- Direct compatibility with four CMT chuck models (183.201, 183.211, 183.221, 183.310) means users already in the CMT ecosystem can confidently source a matching replacement collet for the 1/4 in. tool size.
- Broad spindle nose compatibility means this collet is a practical fit for CNC routers, machining centers, and point-to-point machines - reducing the need to source multiple collet brands for a mixed-machine shop.
Specifications
- Manufacturer Part Number: 184.064.00
- Brand: CMT Orange Tools
- Collet System: ER40
- Standard: DIN 6499
- Bore Diameter: 6.35mm (1/4 in.)
- Compatible Chucks: CMT 183.201, 183.211, 183.221, 183.310
Approved Applications
- CNC Routing
- Milling
- Boring
- General precision machining with 1/4 in. shank tooling
Frequently Asked Questions
What chuck models is this ER40 collet compatible with?
This collet is confirmed compatible with CMT chucks 183.201, 183.211, 183.221, and 183.310. It also fits most tapered spindle noses that accept standard ER40 collets.
What shank diameter does this collet accept?
This collet accepts a 1/4 in. (6.35mm) shank diameter, making it the correct choice for standard 1/4 in. router bits and CNC tooling.
What standard is this collet manufactured to?
This collet is precision ground to the DIN 6499 standard, which governs dimensional accuracy and runout tolerances for ER-type collets used in CNC and machining applications.
Can this collet be used as a replacement, or is it only for new setups?
This is a standard replaceable ER40 collet. It is designed as a direct drop-in replacement for worn or damaged collets in any compatible ER40 chuck or tapered spindle nose, covering the full ER40 range of 3mm to 25mm shank sizes.
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