Product Description
CMT Clamping Nut M40 x 1.5mm Left-Hand for ER32 Chucks is a precision-machined replacement clamping nut engineered to secure collets in CMT chuck systems. Designed specifically for left-hand thread engagement on ER32 toolholding chucks, this clamping nut provides consistent, reliable collet retention across CNC routing and milling applications. The M40 x 1.5mm thread specification ensures a precise, repeatable fit with compatible chuck bodies, making it a dependable choice for maintaining toolholding accuracy during high-demand machining operations.
Key Features
- Left-hand (LH) thread orientation - matches the rotational direction of compatible CMT ER32 chuck assemblies, preventing loosening during operation and maintaining secure collet clamping throughout the cutting cycle.
- M40 x 1.5mm thread specification - delivers a precisely dimensioned thread engagement that ensures uniform clamping force distribution around the collet, reducing runout and protecting tool life.
- 50mm outer diameter - provides a broad bearing surface for wrench engagement, allowing controlled application of clamping torque for repeatable, accurate tool setup.
- Compatible with the 183.000/100/200/250/300/400 chuck series without bearing - fits a wide range of CMT ER32 chuck bodies, simplifying replacement part selection across multiple chuck configurations in your shop.
- Designed for ER32 collet systems - works with the industry-standard ER32 collet format, giving you broad collet compatibility and flexible workholding options across different tool shank sizes.
Why This Product
- When a clamping nut wears or becomes damaged, toolholding accuracy suffers immediately - this direct-fit replacement for CMT 183 series ER32 chucks restores precise collet clamping without requiring a full chuck replacement.
- The left-hand thread design is engineered specifically for chucks that rotate in a direction where a standard right-hand nut would self-loosen - making this the correct and safe choice for those chuck configurations.
- With a 50mm outer diameter, the nut offers a solid, stable gripping surface for a C-spanner, enabling proper torque application and consistent tool setup from one job to the next.
- Compatibility across the 183.000, 183.100, 183.200, 183.250, 183.300, and 183.400 chuck bodies means a single replacement part can serve multiple chuck bodies in a shop environment, reducing spare parts inventory complexity.
Specifications
- Manufacturer Part Number: 992.183.02
- Brand: CMT Orange Tools
- Description: Clamping Nut M40 x 1.5mm LH
- Shank / Thread: M40 x 1.5mm
- Diameter: 50mm
- Rotation / Thread Hand: Left-Hand (LH)
- Compatible Chuck Series: 183.000 / 183.100 / 183.200 / 183.250 / 183.300 / 183.400 (without bearing)
- Collet System: ER32
Frequently Asked Questions
Which CMT chuck series is this clamping nut compatible with?
This clamping nut is designed for use with CMT chuck bodies in the 183.000, 183.100, 183.200, 183.250, 183.300, and 183.400 series - specifically the versions without a bearing. It is a direct-fit replacement for the ER32 collet clamping nut in those chuck families.
Why does this clamping nut have a left-hand thread?
The left-hand (LH) thread is intentional and essential for correct function. On chuck configurations where the spindle or tool rotation would otherwise cause a standard right-hand nut to unwind, the left-hand thread counteracts that force and keeps the collet securely clamped during cutting operations. Always verify your chuck requires an LH nut before installing.
What does the M40 x 1.5mm thread specification mean for my chuck setup?
M40 x 1.5mm describes the metric thread form of the nut - 40mm nominal thread diameter with a 1.5mm thread pitch. This must match the thread on your CMT 183-series chuck body exactly. Using a nut with a non-matching thread pitch can damage the chuck or result in unsafe toolholding - always confirm the thread spec of your existing chuck before ordering a replacement nut.
What is the outer diameter of this clamping nut, and why does it matter?
The outer diameter of this clamping nut is 50mm. This dimension determines which C-spanner or hook spanner fits the nut for tightening and removal. Using a correctly sized spanner ensures that the proper clamping torque can be applied without slipping or damaging the nut, which is critical for consistent collet retention and machining accuracy.
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