Product Description
CMT Clamping Nut M50 x 1.5mm Right-Hand for ER40 Chucks is a precision-machined replacement clamping nut designed to secure ER40 collets in compatible CMT CNC chuck bodies. With a 63mm outer diameter and M50 x 1.5mm right-hand thread, this nut is engineered specifically for use with the CMT 183.201, 183.211, 183.221, and 183.310 chuck series - making it a direct-fit, drop-in solution for shops that rely on CMT toolholding systems for accurate, repeatable machining operations.
Key Features
- M50 x 1.5mm right-hand thread - matches the thread specification of compatible CMT ER40 chuck bodies exactly, ensuring a secure and properly torqued collet clamp every time
- 63mm outer diameter - sized to fit standard ER40 C-spanners and torque wrenches, allowing for proper clamping force application without slippage or damage to the nut face
- Designed without a bearing - a clean, straightforward clamping interface suited to the 183.201, 183.211, 183.221, and 183.310 chuck series, reducing points of wear and simplifying maintenance
- Right-hand (RH) rotation - aligns with standard CNC spindle rotation direction, preventing the nut from loosening under normal cutting loads and maintaining consistent collet clamping during operation
- Direct OEM replacement from CMT - manufactured to the same standards as the original chuck component, so performance and fit remain consistent throughout the tool's service life
Why This Product
- If your CMT ER40 chuck nut is worn, cross-threaded, or damaged, this is the exact replacement component - M50 x 1.5mm RH - that restores full clamping performance without needing to replace the entire chuck body
- Compatibility is clearly defined: this nut is specifically approved for the CMT 183.201, 183.211, 183.221, and 183.310 chuck series, so there is no guesswork about whether it will fit your existing toolholding setup
- The 63mm outer diameter is a practical fit for common ER40 spanner sizes, meaning you can apply correct clamping torque using tools you likely already have on hand
- Sourcing a genuine CMT replacement clamping nut - rather than a generic substitute - ensures the thread pitch and dimensional tolerances remain consistent with the original chuck design, protecting collet accuracy over time
Specifications
- Manufacturer Part Number: 992.383.01
- Brand: CMT Orange Tools
- Description: Clamping Nut M50 x 1.5mm RH
- Outer Diameter: 63mm
- Bore Diameter: M50 x 1.5mm
- Shank: M50 x 1.5mm
- Rotation: Right-Hand (RH)
- Compatible Chuck Series: CMT 183.201, 183.211, 183.221, 183.310
- Collet System: ER40
- Bearing: Without bearing
Frequently Asked Questions
Which CMT chuck bodies is this clamping nut compatible with?
This clamping nut is approved for use with the CMT 183.201, 183.211, 183.221, and 183.310 chuck series. It is designed for ER40 collet chucks that use an M50 x 1.5mm right-hand thread clamping nut without a bearing.
Does this clamping nut include a bearing?
No - this is a clamping nut without a bearing. It is intended specifically for the 183.201, 183.211, 183.221, and 183.310 chuck series, which use this style of nut. Verify your chuck series before ordering to confirm this is the correct replacement component.
What is the thread specification and outer diameter of this nut?
The thread specification is M50 x 1.5mm with right-hand (RH) rotation. The outer diameter is 63mm, which is the standard ER40 clamping nut size and is compatible with typical ER40 C-spanners and torque wrenches used to apply proper clamping force.
Why does the direction of thread rotation matter when selecting a clamping nut?
Thread rotation direction - right-hand (RH) in this case - must match both the chuck body thread and the spindle's direction of rotation. Using a right-hand threaded nut on a right-hand threaded chuck ensures the nut tightens rather than loosens during standard cutting operations, maintaining collet clamping force and workpiece security throughout the cut.
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