Product Description
CMT Precision Collet ER-20, 3/8" (9.5mm) by CMT is a high-accuracy, replaceable collet designed to the DIN 6499 standard for use with ER-20 conical chuck systems. Built for CNC routers, machining centers, and point-to-point machines, this 3/8 in. collet delivers the tight clamping tolerances required for reliable, repeatable performance in milling, boring, and CNC routing applications across a wide range of materials - from hardwood and softwood to aluminum and composite sheet goods.
Key Features
- DIN 6499 precision ground construction - meets the exacting DIN 6499 standard, which translates directly to minimal runout and maximum tool accuracy during high-speed CNC and milling operations.
- ER-20 collet system compatibility - fits most conical ER-20 chuck holders, making this collet a practical, interchangeable solution for multi-machine shops without needing dedicated tooling per machine.
- Replaceable standard design - collets wear over time with heavy use; the replaceable format lets operators restore full clamping precision without replacing the entire chuck assembly, reducing downtime and tooling costs.
- 3/8 in. (9.5mm) bore diameter - sized to securely grip 3/8 in. shank router bits and CNC tooling, providing a firm, vibration-reducing hold that protects both the tool and the workpiece surface.
Why This Product
- Shops running ER-20 chuck systems can rely on this precision collet as a direct, standards-compliant replacement - no modifications or adapters required when swapping between compatible conical holders.
- The DIN 6499 specification ensures the collet is manufactured to internationally recognized tolerances, giving machinists confidence that dimensional accuracy is built in, not assumed.
- Suitable for demanding materials including aluminum and composite panels, this collet supports a broad range of production tasks from fine woodworking to light metalworking without changing the chuck body.
- As a replaceable component, it keeps maintenance straightforward - when clamping performance degrades after extended use, a single collet swap restores full precision rather than requiring a costly chuck replacement.
Specifications
- Manufacturer Part Number: 184.100.20
- Brand: CMT Orange Tools
- Collet System: ER-20
- Standard: DIN 6499
- Shank Diameter: 3/8 in. (9.5mm)
- Bore Diameter: 10mm
- Clamping Tolerance: 0.015mm
Approved Applications
- CNC Routing
- Boring
- Milling
Frequently Asked Questions
What chuck systems is this collet compatible with?
This collet is designed for ER-20 collet systems and is suitable for use with most conical ER-20 chuck holders. Always verify that your specific chuck is rated for ER-20 collets before installation.
What is the clamping tolerance of this collet?
This collet is precision ground to a clamping tolerance of 0.015mm, consistent with the DIN 6499 standard. This tight tolerance supports accurate, low-runout tool holding in CNC routing, milling, and boring applications.
What shank size does this collet accept?
This collet is sized for a 3/8 in. (9.5mm) shank diameter. It has a bore diameter of 10mm and is intended to grip 3/8 in. shank router bits and CNC tooling used in compatible ER-20 chuck holders.
Can this collet be used for machining aluminum and composite materials?
Yes. This ER-20 precision collet is suited for use across a range of materials including hardwood, softwood, MDF, plywood, composite panels, and aluminum, making it a versatile choice for both woodworking and light metalworking CNC applications.
Reviews
FAQs
Standard Shipping is free on most orders over $50 within the contiguous US. If the order is under $50.00, the shipping is $9.99 set fee for shipping within the contiguous US.
Most of our products will ship within 1 to 3 Business Days. Some Special order products will ship within 2 to 5 Business Days. Preorders will be shipped to you on a first come first serve basis as soon as available from the manufacturer. Items that are "Made-to-Order" (Custom order products) will be shipped when fabrication is completed, shipping and delivery times will vary and depend on manufacturing.
Products that are shipped directly from the manufacturer will have processing and fulfilment times subject to manufacturer availability.
Preorders are shipped on a first come first serve basis as soon as available from the manufacturer, the sooner you place your Preorder the sooner your order will ship.
Freight shipping Policy:
Orders/Items too large or heavy may require special handling/Shipping and may require to be sent by truck. Someone must be present to accept truck deliveries. Standard truck delivery is to a dock facility designed to receive freight. You will be notified within 24 hours of ordering to confirm delivery. Lift gates for deliveries are available for an additional fee.
We offer Financing options through Clicklease
Please email your Return request to info@FactoryDirectSupplyOnline.com
Include the order number and the reason for your return.
All returns, regardless of their categorization, must include all original parts, be in their original packaging, and in the condition in which they were received. You may not qualify to receive a refund If the returned item is used, damaged, missing any parts, or is damaged during return shipping.
Checkout our complete Return policy
You can contact us through our contact page! We will be happy to assist you.