INDUSTRY COMPONENT

Spindle Shank

A spindle shank is the tapered or cylindrical interface that connects a finishing tool head to a machine tool spindle, ensuring precise alignment and torque transmission.

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Component Specifications

Definition
The spindle shank is a critical component in machine tools, specifically within finishing tool heads, designed to provide a secure and accurate connection between the tool and the machine spindle. It features standardized tapers (e.g., Morse, BT, CAT) or cylindrical profiles that ensure concentricity, minimize runout, and transmit rotational force efficiently. This component is essential for maintaining machining accuracy, surface finish quality, and operational safety in precision manufacturing processes.
Working Principle
The spindle shank operates on the principle of mechanical interference fit or clamping mechanisms to establish a rigid connection. When inserted into the machine spindle, the tapered surfaces create a self-locking effect through friction, ensuring zero slippage under load. For cylindrical shanks, collets or hydraulic chucks apply uniform radial pressure to secure the tool. This design allows for precise axial and radial alignment, effective torque transmission from the spindle to the tool, and efficient vibration damping during high-speed finishing operations.
Materials
Typically manufactured from high-strength alloy steels such as AISI 4140 or 4340, heat-treated to HRC 45-50 for enhanced wear resistance and toughness. Premium versions may use tool steels (e.g., D2) or carbide-coated surfaces for extended lifespan in high-precision applications.
Technical Parameters
  • Weight 1.2 kg
  • Taper Type BT40
  • Maximum RPM 15,000
  • Taper Angle 7:24
  • Shank Diameter 40 mm
  • Pull Stud Thread M16
  • Runout Tolerance < 0.003 mm
Standards
ISO 7388-1, DIN 69871

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Spindle Shank.

spindle shank tool holder finishing tool head machine tool component taper shank BT shank ISO 7388 precision machining metalworking Spindle Shank in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Finishing Tool Head

The active component of a Surface Finishing Station that directly contacts and processes material surfaces.

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Engineering Analysis

Risks & Mitigation
  • Taper wear leading to poor tool alignment
  • Contamination causing spindle damage
  • Improper clamping resulting in tool ejection
FMEA Triads
Trigger: Accumulation of chips or coolant residue on taper surfaces
Failure: Reduced clamping force and increased runout
Mitigation: Implement regular cleaning protocols and use protective caps when not in use
Trigger: Over-torquing of pull stud during installation
Failure: Thread stripping or shank fracture
Mitigation: Use calibrated torque wrenches and follow manufacturer's installation guidelines

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Taper accuracy within ISO 1947 Grade AT3, runout < 0.005 mm at 150 mm from gauge line
Test Method
Coordinate measuring machine (CMM) verification per ISO 10360-2, taper contact check using bluing compound

Buyer Feedback

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Frequently Asked Questions

What is the difference between a BT and CAT spindle shank?

BT shanks (common in Asia) have a 7:24 taper with a pull stud hole, while CAT shanks (common in North America) use a similar taper but often with different drawbar mechanisms; they are not always interchangeable without adapter modifications.

How often should a spindle shank be inspected for wear?

Inspect every 500 operating hours or monthly in high-use environments. Check for taper surface scoring, corrosion, or dimensional deviations exceeding 0.005 mm to prevent machining inaccuracies.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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