Product Description
CMT Clamping Nut Left-Hand for ER40 is a precision-machined replacement clamping nut designed for use with CMT ER40 collet chuck systems. Built to work with the 183.201, 183.211, 183.221, and 183.310 chuck series, this left-hand threaded nut provides reliable collet retention in CNC routing and machining applications where consistent clamping force is critical. The M50x1.5mm thread profile and 63mm outer diameter are engineered to match ER40 chuck specifications exactly, ensuring a secure, rattle-free connection between the collet and spindle body.
Key Features
- Left-Hand (LH) Thread Rotation - designed specifically for counter-clockwise tightening applications, preventing the nut from loosening during left-hand spindle rotation and keeping the collet securely locked during operation.
- M50x1.5mm Thread Profile - a fine-pitch thread that delivers controlled, even clamping pressure across the collet, reducing the risk of collet distortion and improving tool-holding accuracy.
- 63mm Outer Diameter - sized to fit ER40 chuck bodies precisely, allowing full engagement of the clamping surfaces without interference, which supports consistent and repeatable tool positioning.
- Compatible with CMT 183 Chuck Series (183.201, 183.211, 183.221, 183.310) - a direct replacement that integrates seamlessly with existing CMT ER40 chuck setups, reducing downtime and the need to source cross-brand alternatives.
- Clamping Nut Without Bearing - a straightforward, low-profile design that minimizes moving parts, making maintenance simple and reducing potential points of failure during heavy-duty CNC use.
Why This Product
- Purpose-built for left-hand spindle applications - the LH thread direction ensures the nut tightens rather than backs off during left-hand rotation, solving a critical retention problem that a standard right-hand nut cannot address.
- Direct compatibility with four CMT ER40 chuck models - the 183.201, 183.211, 183.221, and 183.310 series are all supported, making this a single replacement solution across a broad range of CMT ER40 toolholders.
- Fine M50x1.5mm thread pitch - finer pitch means more turns per unit of travel, giving the operator greater control over clamping force and reducing the chance of over-tightening or stripping the thread.
- Bearing-free construction keeps the design simple - fewer components mean fewer parts to wear out or service, which translates to lower maintenance demands in high-cycle CNC production environments.
Specifications
- Manufacturer Part Number: 992.383.02
- Brand: CMT Orange Tools
- Description: Clamping Nut Left-Hand for ER40
- Diameter: 63mm
- Bore Diameter: M50x1.5mm
- Shank: M50x1.5mm
- Rotation: Left-Hand (LH)
- Compatible Chuck Series: 183.201, 183.211, 183.221, 183.310
- Status: Active
Frequently Asked Questions
Which CMT chuck models is the 992.383.02 clamping nut compatible with?
This clamping nut is designed for use with the CMT 183.201, 183.211, 183.221, and 183.310 ER40 chuck series. It is not a universal ER40 nut and should only be used with these specific CMT chucks to ensure proper thread engagement and clamping performance.
Why does this clamping nut have a left-hand thread?
A left-hand thread tightens in the counter-clockwise direction. This is essential for spindle applications where the rotation direction would otherwise cause a standard right-hand nut to loosen over time. Using the correct thread orientation for your spindle direction is critical for safe collet retention.
Does this clamping nut include a bearing?
No, the 992.383.02 is a clamping nut without a bearing. It is a direct replacement designed for the CMT 183 chuck series and relies on the chuck body's existing design for collet engagement rather than an integrated bearing assembly.
What is the thread specification for this ER40 clamping nut?
The clamping nut features an M50x1.5mm thread profile on both the bore diameter and shank. This fine-pitch thread provides precise control over clamping force and is sized specifically for ER40 collet chuck compatibility within the supported CMT chuck series.
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