Product Description
The CMT C-Spanner 95-100mm is a precision hook spanner designed for tightening and loosening collet nuts on EOC25, ER32, and ER40 collet chuck systems. Engineered to match the specific nut diameter range of 95-100mm, this tool delivers secure, damage-free engagement with collet nuts so machinists and CNC operators can achieve accurate clamping force without slipping or marring critical components. Whether you are working with ER32 or ER40 toolholding systems, having the correctly sized spanner means faster tool changes and properly torqued connections every time.
Key Features
- 95-100mm hook spanner range - precisely matches the collet nut diameter of EOC25, ER32, and ER40 systems, ensuring positive engagement and reducing the risk of nut damage during tightening or removal
- Compatible with EOC25, ER32, and ER40 collet nuts - covers three widely used collet chuck standards in a single tool, reducing the number of wrenches needed at the machine
- C-spanner / hook spanner design - applies torque directly to the collet nut groove for controlled, even clamping force that protects both the nut and the toolholder
- CMT part number 991.284.00 - a current, active product that fits directly into the CMT 991 C-spanner accessory line for straightforward replacement or addition to an existing toolset
Why This Product
- Collet nuts in the 95-100mm diameter range require a spanner sized to fit - using an undersized or oversized wrench risks rounding the nut, making this tool the correct, purpose-fit choice for EOC25, ER32, and ER40 systems
- The hook spanner format applies force at the nut's engagement groove rather than across flats, which is the correct method for collet nuts and helps maintain the integrity of precision toolholding components over repeated use
- Covering three compatible collet nut standards - EOC25, ER32, and ER40 - in a single spanner size means one tool handles multiple toolholders, simplifying the tool crib and reducing setup time
- As part of the active CMT 991 C-spanner series, this spanner is a current production item designed to pair with CMT toolholding accessories for a coordinated, system-level approach to collet chuck maintenance
Specifications
- Manufacturer Part Number: 991.284.00
- Brand: CMT Orange Tools
- Description: C-Spanner 95-100mm (EOC25/ER32/ER40)
- Spanner Range: 95-100mm
- Compatible Collet Nut Types: EOC25, ER32, ER40
- Product Series: CMT 991 - C-spanners
- Status: Active
Frequently Asked Questions
Which collet chuck systems is this spanner compatible with?
This C-spanner is designed for use with EOC25, ER32, and ER40 collet nuts that fall within the 95-100mm diameter range. It is not intended for collet nut sizes outside that range.
What is the difference between a C-spanner and a standard open-end wrench for collet nuts?
A C-spanner, also called a hook spanner, engages a groove or pin on the collet nut rather than gripping flat sides. This design is the correct method for tightening and loosening ER-style collet nuts, applying torque evenly without damaging the nut surface.
Can this spanner be used with a torque wrench for controlled clamping?
The CMT 991.284.00 is a hook spanner sized for 95-100mm collet nuts. For applications requiring precise clamping torque, consult the specifications of your torque wrench setup to ensure compatibility with this spanner style.
Is this product part of a larger CMT spanner series?
Yes. The 991.284.00 belongs to the CMT 991 series of C-spanners, which covers a range of collet nut sizes. If your toolholding system uses collet nuts outside the 95-100mm range, other models in the CMT 991 series may be the appropriate choice.
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