Product Description
CMT Precision Collet ER25 - 1/2" (12.7mm) is a high-accuracy ER25 collet engineered to DIN 6499 standards, designed for use in CNC routers, machining centers, and point-to-point machines where consistent tool holding and minimal runout are critical. Manufactured by CMT, this 12.7mm bore collet is a replaceable standard precision collet compatible with most conical chuck systems, making it a practical and reliable choice for milling, CNC routing, and boring operations across a wide range of materials.
Key Features
- DIN 6499 Precision Ground Standard - machined to strict tolerances for minimal runout, which translates directly to cleaner cuts, longer tool life, and improved surface finish quality in CNC routing and milling applications.
- ER25 Collet System - fits the widely adopted ER25 chuck format, meaning this collet integrates easily with a broad range of CNC spindles and machining center configurations without requiring special adapters.
- 1/2" (12.7mm) Bore Diameter - sized to securely grip 1/2" shank router bits and tooling, providing a firm, centered hold that reduces vibration and tool deflection during operation.
- Replaceable Design - because the collet is a separate, replaceable component, worn or damaged collets can be swapped out individually without replacing the entire chuck assembly, reducing downtime and maintenance costs.
- Compatible with Most Conical Chucks - broad compatibility across conical chuck systems means this collet works across multiple machine brands and configurations, offering flexibility in multi-machine shop environments.
Why This Product
- For CNC routing and machining operations where tool accuracy is non-negotiable, this collet delivers DIN 6499 precision - a recognized international standard that ensures consistent clamping tolerance and repeatable performance across production runs.
- The ER25 system is one of the most widely used collet formats in CNC machining centers and point-to-point machines, meaning this collet fits equipment you likely already own without additional tooling investment.
- Whether your application involves hardwood, softwood, MDF, plywood, composite materials, or aluminum, the precise 12.7mm bore grip keeps tooling centered and secure across material types with varying cutting forces.
- As a replaceable standard collet, it supports a cost-effective maintenance strategy - replace only the worn component rather than the entire clamping assembly, keeping machines running with minimal disruption.
Specifications
- Manufacturer Part Number: 184.127.25
- Brand: CMT Orange Tools
- Collet System: ER25
- Bore Diameter: 12.7mm (1/2")
- Standard: DIN 6499
- Product Class: Router Cutter
Approved Applications
- CNC Routing
- Milling
- Boring
Frequently Asked Questions
What does the ER25 designation mean, and is this collet compatible with my machine?
ER25 refers to a standardized collet system with a defined external taper and clamping range. This collet is compatible with most conical chucks designed for the ER25 format, which is a common configuration found in CNC routers, machining centers, and point-to-point machines. Verify that your spindle or chuck accepts ER25 collets before ordering.
What shank size does this collet accept?
This precision collet is sized for a 1/2" (12.7mm) shank diameter. It is intended for use with router bits and CNC tooling that have a 1/2" shank, and should not be used to grip shank sizes outside of its specified bore diameter.
What is DIN 6499 and why does it matter for tool holding?
DIN 6499 is an internationally recognized German engineering standard that defines dimensional and tolerance requirements for collets. A collet manufactured to this standard is precision ground to tight tolerances, which minimizes runout - the amount a spinning tool tip deviates from its true center. Lower runout means more accurate cuts, better surface finishes, and reduced wear on both the tooling and the workpiece.
Can this collet be used across different compatible materials?
Yes. When used in an appropriate CNC router or machining center with compatible tooling, this ER25 collet supports machining of hardwood, softwood, MDF, plywood, composite materials, and aluminum. The material being cut does not affect collet compatibility - what matters is that the tool shank matches the 12.7mm bore and that the collet is seated correctly in a compatible ER25 chuck.
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