Product Description
The CMT C-Spanner 80-90mm for ER20/ER25 is a professional-grade hook spanner designed for tightening and loosening precision collet nuts on ER20 and ER25 collet systems. Built to the "USAG" c-spanner standard, this tool delivers reliable grip and proper clamping torque engagement on CNC toolholding chucks, making it an essential accessory for machinists, toolroom technicians, and CNC operators who demand accurate collet nut service.
Key Features
- Hook spanner design rated for 80-90mm collet nuts - fits precisely over ER20 and ER25 collet nut flats, eliminating slippage and protecting precision surfaces during tightening and loosening
- Compatible with ER20 and ER25 collet systems - covers two of the most widely used collet sizes in CNC machining, reducing the number of individual tools needed in a toolroom
- "USAG" c-spanner construction - conforms to a recognized spanner standard, ensuring consistent fit and force transmission across compatible collet nuts
- Part of the CMT 991 c-spanner series - designed to integrate with CMT collet tooling accessories for a coordinated, matched-component approach to collet nut maintenance
Why This Product
- Covers both ER20 and ER25 collet nut sizes in a single tool - operators working with multiple collet sizes can service both with one spanner, saving time and bench space
- The 80-90mm hook spanner range is sized specifically for ER20/ER25 collet nuts, which means no makeshift wrenches or ill-fitting tools that risk damaging precision collet nut threads
- Built to the "USAG" c-spanner standard, this spanner provides repeatable, predictable engagement - important when paired with a torque wrench to achieve correct clamping force on CNC toolholders
- As an active CMT 991-series accessory, this spanner is a purpose-built companion to CMT collet tooling - not a generic substitute - supporting proper care of high-precision toolholding components
Specifications
- Manufacturer Part Number: 991.285.00
- Brand: CMT Orange Tools
- Description: C-Spanner 80-90mm (ER20/ER25)
- Spanner Range: 80-90mm
- Compatible Collet Systems: ER20, ER25
- Spanner Type: Hook Spanner (C-Spanner)
- Series: CMT 991 C-Spanners
- Status: Active
Frequently Asked Questions
Which collet nut sizes does this c-spanner fit?
This hook spanner is sized for 80-90mm collet nuts and is specifically compatible with ER20 and ER25 collet systems.
What type of spanner is the CMT 991.285.00?
It is a hook spanner - also referred to as a c-spanner - built to the "USAG" c-spanner standard. This design wraps around the collet nut to provide secure engagement when tightening or loosening.
Can this spanner be used with a torque wrench for precise clamping?
Yes. The c-spanner is designed to engage collet nuts for proper clamping torque application. Using it alongside a compatible torque wrench allows operators to achieve accurate and consistent clamping force on ER20 and ER25 toolholders.
Is this spanner part of a larger CMT accessory system?
Yes. The 991.285.00 belongs to the CMT 991 series of c-spanners, which is a dedicated line of collet nut spanners designed to complement CMT collet tooling and toolholding accessories.
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