# Collet ER25 Ø4 mm, FORTIS model TULEJKA ER25 FI 4 - 3 DIN6499

**URL:** https://aio.lv/en/product--fortis-0642176183607--11726439
**Data updated:** 2026-03-08 11:29 (EET)
**Category:** Power Tools Accessories
**Manufacturer:** FORTIS
**Manufacturer code:** 0642176183607
**EAN:** 5905555223636
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

FORTIS TULEJKA ER25 FI 4 - 3 DIN6499 is an ER25 collet with a 4 mm inner diameter designed to secure round shank tools and cutters in milling spindles and collet chucks. Manufactured to DIN6499 dimensions for consistent clamping accuracy, it provides concentric gripping for drilling, milling and finishing operations. Suitable for workshop and production use where ER25 tooling is required.

## Long description

FORTIS TULEJKA ER25 FI 4 - 3 DIN6499 is an ER25 collet with a 4 mm inner diameter designed for secure clamping of round shank tools in milling spindles and collet chucks. Manufactured to DIN6499 dimensions, the collet ensures consistent clamping accuracy and concentric gripping, making it suitable for drilling, milling and finishing operations in both workshop and production environments.
Advantages
The ER25 design provides uniform radial clamping force across the tool shank, reducing runout and improving repeatability. Compliance with DIN6499 dimensions supports interchangeability with standard ER25 nut and holder systems. Its 4 mm bore is optimized for small-diameter end mills, drills and reamers, offering stable fixation during high-speed rotation and light to moderate cutting loads.
Suitable for
 Securing 4 mm round shank end mills and drills
 Milling, drilling and finishing tasks requiring concentric clamping
 Bench and production milling spindles using ER25 toolholding
 Tooling setups that require DIN6499-compatible components
Key specifications
 Collet type: ER25
 Inner diameter: 4 mm
 Standard: DIN6499 dimensions
 Material: spring steel (heat-treated for resilience)
 Clamping range: designed for precise 4 mm round shanks
How to use
Insert the tool shank into the collet bore and assemble the collet into an ER25 nut or chuck according to the machine manufacturer's instructions. Tighten the nut to the recommended torque so the collet compresses evenly around the 4 mm shank to achieve concentric clamping. Inspect the tool and collet for cleanliness and free of burrs before assembly to maintain accuracy and prevent damage.
Usage recommendations
For best performance, keep the collet and holder clean and free of chips and coolant residues. Use the correct ER25 nut and follow the machine's torque specifications. Replace the collet if signs of wear, deformation or significant loss of concentricity appear to maintain machining accuracy and safety.

## FAQ

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All FORTIS products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized FORTIS service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11726439/67106710_large.webp