Spindle Shank: Shank Diameter 40 mm, Weight 1.2 kg

Q: 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.

Q: 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.

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

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 7388-1, DIN 69871

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

Typical Suppliers & Equivalents

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

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Spindle Shank

Manufacturer profiles associated with Spindle Shank.

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Frequently Asked Questions

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