Editorial Technical Reference

Tactile probe stylus

This page explains how Tactile probe stylus is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A precision contact sensor component used for dimensional measurement and surface profiling.

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Tactile probe stylus in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Tactile probe stylus

Definition
The tactile probe stylus is a critical component of the Multi-sensor Probe Head, serving as the physical interface that makes direct contact with the workpiece. It transmits surface coordinate data to the probe's sensing system for dimensional metrology, quality control, and reverse engineering applications. Available in a range of configurations, the stylus features a ball tip made from ruby, zirconia (ZrO2), or silicon nitride (Si3N4), each selected for specific wear resistance, cost, or toughness requirements. Tip diameters range from 0.5 to 6.0 mm, allowing access to tight features while larger tips offer enhanced durability. Stylus lengths vary from 10 to 100 mm, providing reach for deep bores at the cost of potential rigidity reduction. Thread sizes conform to ISO 68-1 (M2, M3, M4, M5) to match various probe head interfaces. Precision is ensured through strict tolerances: straightness ≤0.001 mm per ISO 1101, sphericity ≤0.0005 mm per ISO 3290, and surface roughness (Ra) ≤0.02 µm per ISO 4287. The stylus operates within a temperature range of -40 to 85 °C, with a maximum contact force of 0.05 to 0.5 N to prevent damage to the workpiece or stylus. Weight ranges from 1 to 10 g, affecting the dynamic response of coordinate measuring machines (CMMs). An IP rating of IP54 to IP65 per IEC 60529 provides protection against dust and water for shop floor use. Always verify model-specific values and standards with the legal manufacturer or supplier before procurement.
Working Principle
When the stylus tip contacts a workpiece surface, it deflects slightly. This deflection is detected by strain gauges or other sensing mechanisms within the probe head, which convert the physical movement into electrical signals. These signals are processed to determine the precise XYZ coordinates of the contact point.
Common Materials
Ruby, Tungsten carbide, Silicon nitride
Technical Parameters
ParameterTypical rangeNotes & selection driver
Tip Diameter0.5–6.0 mmSmaller tips access tight features; larger tips are more durable.
Stylus Length10–100 mmLonger reach for deep bores; may reduce rigidity.
Ball MaterialRuby, ZrO2, Si3N4Ruby for wear resistance; ZrO2 for cost; Si3N4 for toughness.
Thread SizeM2, M3, M4, M5Must match probe head interface.ISO 68-1
Straightness≤0.001 mmCritical for accurate measurement.ISO 1101
Sphericity≤0.0005 mmAffects repeatability of contact point.ISO 3290
Surface Roughness (Ra)≤0.02 µmSmooth surface reduces friction and wear.ISO 4287
Operating Temperature-40–85 °COutside range may cause thermal expansion errors.
Maximum Force0.05–0.5 NHigher force may damage workpiece or stylus.
Weight1–10 gAffects dynamic response of CMM.
IP RatingIP54–IP65Protection against dust and water for shop floor use.IEC 60529

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

Components / BOM
  • Stylus tip Part
    Precision spherical contact point that touches the workpiece surface
    Material: Ruby or ceramic
  • Stylus shaft Part
    Rigid structural element connecting tip to mounting interface
    Material: Stainless steel or carbon fiber
  • Mounting shank Part
    Standardized interface for attachment to probe head
    Material: Stainless steel

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: 0 to 50 kPa contact pressure
other spec: Maximum stylus deflection: 0.5 mm, Vibration tolerance: <5 g RMS
temperature: -20°C to +80°C
Media Compatibility
✓ Metallic surfaces (steel, aluminum) ✓ Plastic components (ABS, polycarbonate) ✓ Ceramic materials
Unsuitable: Abrasive slurry environments with particulate >50 μm
Sizing Data Required
  • Required measurement resolution (μm/mm)
  • Target surface hardness (Rockwell/Shore scale)
  • Maximum allowable contact force (mN)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Tip wear and deformation
Cause: Repeated contact with hard surfaces causes abrasive wear, while excessive force leads to plastic deformation, compromising measurement accuracy.
Shaft misalignment or bending
Cause: Improper handling, accidental impacts, or excessive lateral forces during use cause mechanical damage to the stylus shaft, affecting probe geometry and precision.
Maintenance Indicators
  • Visible wear, flattening, or deformation of the stylus tip during routine inspection
  • Audible clicking or grinding noises during probe contact, indicating mechanical interference or damage
Engineering Tips
  • Implement regular calibration checks using a master sphere or artifact to detect early wear and maintain measurement traceability
  • Use appropriate probe force settings and avoid unnecessary contact with surfaces; store in protective cases when not in use to prevent physical damage

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 10360-2:2009 - Geometrical product specifications (GPS) - Acceptance and reverification tests for coordinate measuring machines (CMM) ANSI/ASME B89.1.12 - Methods for Performance Evaluation of Coordinate Measuring Machines DIN EN ISO 10360-5:2020 - Geometrical product specifications (GPS) - Acceptance and reverification tests for coordinate measuring systems (CMS) - Part 5: CMMs using single and multiple stylus contacting probing systems

Quoted from the published standard.

Manufacturing Precision
  • Stylus tip sphericity: +/-0.0005 mm
  • Stylus shaft straightness: 0.001 mm per 25 mm length
Quality Inspection
  • Stylus tip sphericity verification using optical comparator or CMM
  • Stylus shaft runout measurement using precision dial indicator or laser interferometer
Technical documentation
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Manufacturing capability
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Inspection readiness
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Supplier transparency
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Manufacturers of Tactile probe stylus

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Frequently Asked Questions

What materials are available for the stylus ball?

The ball material can be ruby, zirconia (ZrO2), or silicon nitride (Si3N4). Ruby offers high wear resistance, ZrO2 is cost-effective, and Si3N4 provides toughness. The choice depends on the application's requirements.

What thread sizes are available?

Thread sizes conform to ISO 68-1 and include M2, M3, M4, and M5. The thread must match the probe head interface, so verify compatibility with your equipment.

What is the maximum contact force?

The maximum force ranges from 0.05 to 0.5 N. Exceeding this range may damage the workpiece or the stylus, so it is important to operate within the specified limits.

What IP rating does the stylus have?

The IP rating is IP54 to IP65 per IEC 60529, providing protection against dust and water. This makes it suitable for shop floor environments, but confirm the exact rating for your model.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Related equipment

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Multi-sensor Probe Head
View system integration details

Industrial Ecosystem & Supply Chain Structure

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

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