Rego-Fix ER Holders – The Standard Everyone Else Follows

by Bernard Martin

If you’re working in a shop with CNC mills, routers, live tooling or turning centers, chances are you’ve already got ER collet holders in your lineup. But not all ER holders are created equal—and Rego-Fix proves that every day. After all, they invented the ER collet system back in the 1970s. That’s not just history; it’s the foundation of a product line that continues to lead the industry in performance, repeatability, and innovation.

Rego-Fix ER holders are built for versatility. Whether you’re spinning CAT, BT, SK, or HSK tapers in a vertical mill, sliding into CYL or CYD straight shanks on a turning center, or dialing in ISO 20 toolholders on a CNC router, there’s a Rego-Fix ER solution designed to match. They even offer Comet holders for rigid tapping. Every one of these options is grounded in Swiss precision and backed by decades of development.

Rego-Fix has refined and expanded their offering to suit nearly every spindle and application across milling, drilling, reaming, grinding, and tapping.

What sets their system apart isn’t just legacy—it’s engineering. From ultra-precision concentricity to full-spectrum compatibility across tapers, routers, and turning centers, Rego-Fix has the most comprehensive ER collet holder lineup on the market.

Built to Fit Your Machines—No Matter
What You’re Running

One of the biggest strengths of the Rego-Fix ER collet holder lineup is just how versatile it is. These holders aren’t limited to one or two machine types—they’re engineered to integrate seamlessly with nearly any machine interface you’ll find in a machine shop today.

Running a vertical or horizontal mill? You’ve got all the usual suspects covered:

• CAT tapers (ANSI B5.50) are a North American staple—Rego-Fix offers these in multiple gage lengths, balanced options, and coolant-through variations.
• BT tapers (JIS B 6339) are popular in Japanese and Korean machining centers thanks to their symmetrical design and excellent rigidity at high speeds.
• SK holders (DIN 69871) serve as the European equivalent to CAT, but with a flange design that ensures tight toolholder-to-spindle contact.
• HSK interfaces (DIN 69893 A, C, E, F, T) are your go-to when you’re pushing the spindle RPM. The dual-contact design (flange and taper) gives superior accuracy and repeatability for high-speed machining, and Rego-Fix offers a complete range to match different HSK types depending on your spindle’s interface and drawbar system.

Got a live turret or a modular tool block system?  Straight shank holders are your friend.

• CYL holders are plain cylindrical shanks—easy to clamp in sleeves, blocks, or any system where axial alignment is crucial.
• CYD holders add a drive slot that prevents rotation in the sleeve or block, giving you better torque resistance in mill-turn and lathe setups.

Working with routers or tapping heads? Rego-Fix has you covered here too:

• ISO 20 toolholders are compact and lightweight, ideal for smaller CNC routers where spindle mass and speed control are critical.
• Comet holders are designed for rigid tapping applications. When paired with ERC tapping collets, they deliver high-precision torque transmission with square-drive compatibility to prevent slippage and tap breakage—perfect for synchronized or rigid tapping cycles.

Performance Specs That Actually
Move the Needle

Let’s talk numbers—the ones that affect your finishes, your tooling life, and your spindle bearings:

• Total Indicated Runout (TIR): Standard ER collets hit ≤10 microns, but if you need tighter tolerances think precision reaming or micro-tooling, the Ultra-Precision ER-UP collets bring it down to ≤5 microns.
  
• Clamping Range: You’re covered from 0.2 mm up to 36 mm across ER 8 to ER 50 collets. Whether it’s a 1/8" end mill or a 1-3/8" drill, there’s a holder-collet combo ready to grip it securely.
• Balance: G2.5 at 25,000 RPM or better isn’t just a spec—it means less chatter, less spindle wear, and better surface finishes when running at high speeds, especially on HSK and BT tapers.
• Coolant-Through Options: Rego-Fix doesn’t force you to buy a whole new system to get through-spindle coolant. Their holders work with sealing disks, or you can retrofit an existing setup with the reCool® system—convert your external-coolant ER holders into internal coolant delivery in minutes.
• Material and Construction: Each holder is made from case-hardened alloy steel with a precision-ground taper and internal bore. That’s not just for looks—it resists wear, corrosion, and distortion under load, so you can count on long-term concentricity and durability.

Tap with Confidence – Rego-Fix ERC
Tapping Solutions

Tapping’s one of those operations where there’s no room for error—misalignment, poor torque control, or tool pullout can destroy a part in seconds. That’s why Rego-Fix designed their ERC tapping collets and Comet holders as a precision-matched system to get the job done right the first time.

ERC tapping collets come standard with a square drive interface, which means your tap isn’t just clamped—it’s locked in. That square drive transmits torque directly to the tool without relying solely on friction, which helps prevent slippage and protects against broken taps, especially on tough materials or fine-pitch threads.

Need coolant through the tap? No problem. ERC collets are available with internal coolant channels to keep cutting edges cool and flush chips from deep blind holes. That’s a huge advantage when threading aluminum, stainless, or any material that likes to gall up in the flutes.

These collets are compatible with a wide range of global thread standards—ISO, DIN, ANSI, and JIS—so no matter what print comes across your desk, you’re covered. And when you pair them with Rego-Fix Comet holders, you get a rigid and balanced setup that supports both synchronous (rigid) tapping and floating tap cycles on older equipment.

It’s a plug-and-play solution that’s built for accuracy, repeatability, and tool life—exactly what you want in a production tapping setup.

Bring It All Together with Factory Tooling Solutions
Whether you're running high-speed mills, turning centers, routers, or just looking to finally solve that tool pullout issue on your heavy roughing job, Factory Tooling Solutions has the complete Rego-Fix ER system to get you there and distributor partners to service you.  Get in touch with FTS and they'll have on of their application engineers on-site to help you out!

From precision-tuned holders and ultra-accurate collets to square-drive tapping systems and coolant conversion kits, we’ll help you spec the right combination for your machine and your process.
Ready to upgrade your toolholding game? Let’s talk ER solutions that actually make a difference.

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