Product Description
The CMT ER40 Precision Collet for 5/16" (8mm) shank tools is a high-accuracy collet machined to the DIN 6499 standard, designed for use in ER40 chuck systems on CNC routers, machining centers, and point-to-point machines. Built for professionals who demand repeatable tool holding with minimal runout, this collet accepts 5/16" (8mm) shank diameter router bits and milling tools, making it a reliable replacement or spare for demanding CNC routing, boring, and milling operations across a wide range of compatible materials.
Key Features
- DIN 6499 precision ground construction - meets the internationally recognized DIN 6499 standard for collet accuracy, delivering minimal runout and consistent tool positioning critical for fine CNC work and milling operations.
- ER40 collet system compatibility - fits CMT chucks 183.201, 183.211, 183.221, and 183.310, as well as most tapered spindle noses that accept standard ER40 collets, giving you broad machine compatibility.
- 5/16" (8mm) bore diameter - precisely sized to grip 8mm shank router bits and cutting tools securely, preventing tool slip during high-speed CNC routing, boring, and milling passes.
- Replaceable standard ER40 design - interchangeable with the full range of standard ER40 collets from 3mm to 25mm, making it easy to swap in a fresh collet and maintain tooling accuracy without replacing the entire chuck system.
- Engineered for a wide material range - suited for use with hardwood, softwood, MDF, plywood, composite materials, and aluminum, supporting versatile shop and production environments.
Why This Product
- Drop-in replacement for ER40 systems - because this collet conforms to the standard ER40 specification and fits most tapered spindle noses, it works across a broad range of CNC routers and machining centers, not just CMT-branded equipment, reducing downtime when a worn collet needs to be replaced.
- Accuracy where it counts - DIN 6499 precision grinding means tool runout is kept to a minimum, which translates directly into cleaner cuts, longer tool life, and tighter tolerances when routing or milling aluminum and engineered wood products.
- Versatile across common shop materials - with compatibility across hardwood, softwood, MDF, plywood, composite, and aluminum, this single collet supports a wide variety of production tasks without requiring multiple specialized tool holders.
- Scalable within the CMT ER40 ecosystem - works alongside the full CMT ER40 collet range (3mm to 25mm), so as your tooling needs grow or change, you can add collets in other sizes without switching chuck systems or investing in new spindle hardware.
Specifications
- Manufacturer Part Number: 184.082.00
- Brand: CMT Orange Tools
- Collet System: ER40
- Bore Diameter: 5/16" (8mm)
- Standard: DIN 6499
- Compatible Chucks: 183.201, 183.211, 183.221, 183.310
- Clamping Range: 3mm to 25mm (standard ER40)
- Clamping Tolerance: 0.015mm
Approved Applications
- CNC Routing
- Boring
- Milling
Frequently Asked Questions
Which CMT chucks is this ER40 collet compatible with?
This collet is designed for use with CMT chucks 183.201, 183.211, 183.221, and 183.310. It also fits most tapered spindle noses that accept standard ER40 collets, making it broadly compatible across many CNC routers and machining centers.
What shank diameter does this collet accept?
This collet is sized for a 5/16" (8mm) shank diameter. It is designed to securely grip router bits and cutting tools with an 8mm shank for use in CNC routing, boring, and milling applications.
What does DIN 6499 precision mean for my tooling performance?
DIN 6499 is an international standard for collet manufacture. Collets machined to this standard are precision ground to maintain a clamping tolerance of 0.015mm, which minimizes tool runout and helps ensure clean, accurate cuts and longer cutting tool life.
Can this collet be used with materials other than wood?
Yes. This ER40 collet supports CNC routing, boring, and milling operations across hardwood, softwood, MDF, plywood, composite materials, and aluminum, making it suitable for a wide range of shop and production environments.
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.