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617003 | CAT TAPER | END MILL HOLDERS

$89.00
Chicago, USA Stock -
Canada Stock -
CAT40-SLN1/4"-2-1/2"-END MILL HOLDER
Specification
Description
CAT40-SLN1/4"-2-1/2"-END MILL HOLDER

Accuracy

PAC Precision Tools CAT Taper End Mill Holders are designed for rigid tool holding and reliable torque transmission in vertical machining centers. Built from premium case-hardened alloy steel, these holders prevent tool pull-out during heavy roughing and high-load cutting operations.

Features

  • Balanced to 25,000 RPM at G2.5
  • AT3 class taper accuracy for precise spindle fit
  • Set screw (Weldon flat) locking system to prevent tool pull-out
  • H5 bore tolerance for maximum surface contact
  • High-precision pilot bore for improved concentricity
  • Hardness: HRC 56–58
  • Case depth: 0.8 mm ± 0.2 mm
  • Surface roughness: Ra < 0.0005 mm
  • Available bore sizes: 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 5/8", and 3/4"
  • Available in CAT40 and CAT50 taper configurations

Frequently Asked Questions

1. What is a CAT Taper End Mill Holder? ▼
A CAT Taper End Mill Holder is designed to fit CNC machines with CAT-type spindles. The steep taper connection ensures solid tool holding, enhanced accuracy, and excellent stability during demanding machining operations.
2. What are the benefits of PACTools CAT Taper End Mill Holders? ▼
CAT Taper End Mill Holders deliver high rigidity, excellent balance, and strong grip strength. They are widely used in milling operations where precision, repeatability, and vibration-free performance are essential for achieving fine surface finishes.
3. Which sizes of CAT Taper are available at PACTools? ▼
PAC Precision Tools provides CAT40 and CAT50 Taper End Mill Holders, each designed to fit specific machine spindle types and handle various cutting forces. The range ensures compatibility with multiple CNC milling applications. For any query, contact us at +1 262-282-2456 or email us at sales@pactoolsusa.com.
4. Can CAT Taper holders be used for high-speed machining? ▼
Yes, CAT Taper End Mill Holders are carefully balanced for smooth performance at high spindle speeds. Their design minimizes vibration and ensures consistent tool engagement, even under heavy cutting loads.
5. Are CAT End Mill Holders compatible with standard pull studs? ▼
Yes, PAC Precision Tools CAT holders are designed to work with standard pull studs that match the holder’s thread size. This ensures a secure connection between the spindle and the holder for precise machining.
6. How can I maintain CAT Taper holders from PACTools? ▼
Keep the taper surface clean, check the pull stud threads, and avoid exposing holders to coolant or chips when not in use. Regular cleaning helps prevent corrosion and keeps tool alignment accurate. For more support, email us at sales@pactoolsusa.com.
7. What makes CAT Taper holders popular? ▼
Their strength, accuracy, and universal compatibility make CAT Taper End Mill Holders ideal for a wide range of CNC milling operations, from rough cutting to high-precision finishing.

Features

  • AT3 Class taper accuracy for precise spindle fit
  • H5 bore tolerance for optimum surface contact with the cutting tool
  • High-precision pilot bore for improved concentricity
  • Available tapers: BBT30, BBT40, BT30, BT40, BT50, HSK63A, HSK100A
  • Balanced to 25,000 RPM at G2.5
  • The flange coolant AD+B feature is standard in all CAT holders with inch sizes
  • All corrosion-proof holders have a special rust preventive coating
  • Hardness: HRC 56–58
  • Carbon depth: 0.8 mm ± 0.2 mm
  • Surface Roughness: Ra < 0.005 mm
  • Crafted from case-hardened alloy steel

Frequently Asked Questions

1. What is an End Mill Holder? ▼
An End Mill Holder is a tool for securely clamping a cutting tool, like an end mill, into a milling machine spindle to prevent it from rotating during use. These holders provide a more rigid and stable connection than a standard collet, especially for heavy-duty applications, by using a set screw to grip a flat, known as a Weldon shank, on the end mill’s body.
2. What are the benefits of using PACTools End Mill Holders? ▼
End Mill Holders provide excellent rigidity, reliable performance, and reduced tool slippage and vibrations. They are ideal for demanding machining operations where strength and stability are essential for maintaining precision, dimensional accuracy, and surface quality.
3. How is an End Mill Holder different from an ER Collet Holder? ▼
An end mill holder uses a set screw to push against the tool shank, which is less rigid and more prone to runout than an ER collet holder, making it suitable for less demanding applications. An ER collet holder uses a collet with a conical shape to grip the tool shank with high accuracy and a more rigid, vibration-damping grip, making it better for general-purpose and high-speed machining. End Mill Holders are better for high-torque applications, while ER Collet Holders are more versatile for lighter and varied tool sizes.
4. What sizes are available for End Mill Holders? ▼
PAC Precision Tools offers End Mill Holders in multiple taper configurations, such as CAT, BT, and HSK, to fit a wide range of CNC spindles. Each size ensures precision fit, excellent balance, and compatibility with standard tool shank diameters used in machining. And the available project length is from 1-3/4", 2", 2-3/8", 2-1/2", and more. For more info, please contact us.
5. Are End Mill Holders suitable for high-speed machining? ▼
Yes, PAC Precision Tools End Mill Holders can be suitable for high-speed machining, but it depends on the specific holder type and its quality. While traditional solid end mill holders are not recommended for high-speed machining operations due to their lack of balance, more advanced and precise holders like collet chucks, hydraulic holders(chucks), of those with high-speed tapers like HSK are well-suited for high-RPM operations
6. How should I maintain End Mill Holders? ▼
Clean the holders after every use, remove metal chips and coolant residue, and lightly oil the surface to prevent rust. Proper care maintains accuracy, improves performance, and extends the lifespan of both the holder and the spindle. For more guidance on maintenance, you can email us at sales@pactoolsusa.com.
7.Do End Mill Holders support coolant-through systems? ▼
Yes, selected models feature coolant-through capability that allows coolant to flow directly to the cutting area. This feature improves chip removal, tool life, and overall machining efficiency, especially during high-speed or deep-cutting operations
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