[Product Overview]

The Straight Shank Collet Chuck (often referred to as an ER Extension Holder) is a problem-solving tool for CNC machinists. When a standard tool holder cannot reach the bottom of a deep pocket or clear a tall fixture, the straight shank extension is clamped into a standard end mill holder, hydraulic chuck, or shrink-fit chuck to extend the cutting tool's reach. The slim profile of the ER nut allows for excellent clearance in tight spaces, making it indispensable for complex mold making and 5-axis machining.

[Key Features & Advantages]

• High-Precision Runout: The internal collet taper and the external straight shank are precision ground in a single setup. Runout (T.I.R.) is strictly controlled to ≤ 0.005mm, minimizing tool wear and ensuring superior surface finishes.

• Premium Material & Hardness: Constructed from high-quality alloy steel. The surface is hardened to HRC 56-60 for excellent wear resistance against chips, while the core remains tough to absorb cutting vibrations and prevent snapping.

• Slim Profile Design: We offer both standard hex nuts and Mini (M-Type) nuts. The M-Type nut provides the smallest possible outside diameter, maximizing clearance for deep, narrow cavities.

• Versatile Clamping: Compatible with all standard DIN 6499 ER collets. A single holder can clamp a wide range of tool shank diameters simply by changing the collet.

• Comprehensive Size Range: Available in various shank diameters (e.g., C16, C20, C25, C32) and lengths (e.g., 100mm, 150mm, 200mm) to suit any deep-reach application.

[Why Partner with Pingyuan Zhenghao Machinery?]

• Direct Manufacturer Savings: We produce these extension holders in massive quantities, allowing us to offer highly competitive wholesale prices to distributors and large machine shops.

• Strict Quality Control: Every holder is inspected using advanced air gauges and concentricity testers before packaging.

• One-Stop Tooling Solution: We also manufacture the matching ER Collets, Clamping Nuts, and Spanner Wrenches, ensuring perfect compatibility and performance.

• OEM & Customization: We can laser engrave your brand logo, part numbers, and custom specifications directly onto the shanks.

Frequently Asked Questions (FAQ) - Selection Guide

Q1: What does "C20-ER16M-150L" mean?

A: This is the standard naming convention:

• C20: Straight shank diameter is 20mm.

• ER16: Uses standard ER16 collets.

• M: Equipped with a Mini (slotted) nut for better clearance (A standard hex nut would have no letter or an 'A').

• 150L: The total length of the holder is 150mm.

Q2: How do I hold the straight shank in my CNC machine?

A: The straight shank itself does not go directly into the machine spindle. It must be clamped by another tool holder, such as a high-precision Collet Chuck, a Milling Chuck (Power Chuck), a Hydraulic Chuck, or a Shrink-Fit Chuck.

Q3: Can I use this for heavy roughing?

A: Straight shank extensions are primarily designed for reaching deep cavities, finishing passes, drilling, and light to medium milling. Because of the extended length, heavy roughing can induce chatter and vibration. For heavy material removal, use the shortest, thickest holder possible.

Q4: Do you offer coolant-through options?

A: Yes. Standard holders are solid, but we can manufacture straight shank extensions with a central through-hole for internal coolant delivery upon request.

Extend your machining capabilities with our precision straight shank holders.

Contact our sales team today for a complete catalog and bulk pricing.