Editorial Technical Reference

Rack

This page explains how Rack 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 linear gear component with teeth cut along its length that meshes with a pinion gear to convert rotational motion into linear motion.

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Product Specifications

Technical details and manufacturing context for Rack

Definition
In mechanical power transmission systems, particularly in rack and pinion mechanisms, the rack is the straight, toothed bar that engages with the teeth of a rotating pinion gear. This engagement converts the rotational motion of the pinion into precise linear movement of the rack, or vice versa. It is a fundamental component in systems requiring controlled linear positioning, actuation, or force transmission. The rack is typically manufactured from materials such as carbon steel, alloy steel, or stainless steel, depending on the application requirements for strength, wear resistance, and corrosion resistance. The primary specification for a rack is the module (or diametral pitch), which defines the size and spacing of the teeth and is critical for proper meshing with the pinion. This parameter is expressed in millimeters and must be matched with the corresponding pinion to ensure correct engagement. Racks are used in a wide range of industrial applications, including machine tools, automation equipment, and material handling systems. When selecting a rack, it is essential to verify the module, tooth profile, and material grade with the manufacturer or supplier, as these factors affect load capacity, precision, and durability. The rack's performance depends on proper installation, alignment, and lubrication. Regular inspection for wear, tooth damage, and backlash is recommended to maintain reliable operation. In any procurement or design process, confirm that the rack meets the specific requirements of your application, including load, speed, and environmental conditions. Always consult the manufacturer's documentation for detailed specifications and compliance with relevant standards.
Working Principle
The rack operates on the principle of gear meshing. As the pinion gear rotates, its teeth engage with the teeth on the rack. This engagement forces the rack to move linearly along its axis. The direction of the rack's movement is determined by the direction of the pinion's rotation, and the distance traveled is proportional to the number of pinion rotations and the gear pitch. The module of the rack and pinion must match to ensure smooth and efficient power transmission. The linear motion produced can be used for positioning, actuation, or force transmission in various mechanical systems.
Common Materials
Carbon Steel, Alloy Steel, Stainless Steel
Technical Parameters

What to specify in your RFQ

  • Module (or Diametral Pitch) - defines the size and spacing of the teeth, critical for proper meshing with the pinion. in mm

These are the quantities to specify to the manufacturer when sizing or requesting a quote. The manufacturer's own documentation governs the exact figures and applicable standard.

Components / BOM
  • Rack Structure
    The rack itself: carries the modules and holds them in their slot positions.
  • Tooth Flank Part
    The working surface of the tooth that contacts the pinion gear to transmit motion and force.
    Material: Hardened Steel
  • Root Part
    The base of the tooth between the flanks, designed to withstand bending stresses.
    Material: Steel
  • Pitch Line Part
    The imaginary line along which the rack and pinion theoretically roll without slipping, used for dimensioning.
    Material: N/A (Reference)

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Rack.

Gear Rack Linear Gear

Applied To / Applications

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

Ball Screw or Rack & Pinion
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: N/A (mechanical component, not fluid pressure)
speed limit: Up to 2 m/s for standard precision racks, higher with specialized designs
temperature: -40°C to 120°C (standard steel), up to 400°C with special alloys
load capacity: Dependent on material and tooth profile, typically 500N to 50kN per linear meter
Media Compatibility
✓ Industrial machinery lubrication (grease/oil) ✓ Clean dry air environments ✓ General manufacturing atmospheres
Unsuitable: High-concentration abrasive slurry environments without protective sealing
Sizing Data Required
  • Required linear force/torque conversion
  • Maximum travel distance and positioning accuracy
  • Operating speed and duty cycle

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Backlash varies along the travel
Cause: The rack is mounted to a surface that is not straight, or successive rack segments are butted without controlling pitch across the joint, so the centre distance to the pinion changes along the stroke and positioning error becomes a function of position
Tooth flank pitting under repeated loading
Cause: Hertzian contact stress at the meshing flanks exceeds the material's endurance limit, usually first where the lubricant film is thinnest; pits grow into spalling and the drive becomes noisy and loses accuracy
Maintenance Indicators
  • Positioning error that repeats at the same place along the travel rather than growing with distance
  • Rising noise together with visible pitting on one flank of the teeth, typically in the most-used section of the stroke
Engineering Tips
  • Check pitch continuity across the joint where racks are butted end to end - the joint is where cumulative error and impact loading concentrate
  • Maintain the lubricant film specified for the pitch-line velocity: flank pitting is a lubrication failure long before it is a load failure

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 1328-1: Cylindrical gears - ISO system of flank tolerance classification - Part 1: Definitions and allowable values of deviations relevant to flanks of gear teeth ISO 6336: Calculation of load capacity of spur and helical gears

Quoted from the published standard.

Manufacturing Precision
  • Cumulative pitch deviation over the rack length within the declared ISO 1328-1 tolerance class
  • Backlash with the mating pinion within the specified range over the whole travel, not only at the mounting point
Quality Inspection
  • Tooth profile and pitch deviation measurement over the full rack length against the declared tolerance class
  • Straightness and mounting-face measurement over the full length, since a bowed rack changes backlash along the travel

Manufacturers of Rack

Manufacturer profiles associated with Rack.

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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 6 September 2026

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Frequently Asked Questions

What materials are racks typically made of?

According to the directory, racks are commonly made from carbon steel, alloy steel, or stainless steel. The specific material grade should be confirmed with the manufacturer based on application requirements.

What is the key specification for a rack?

The key specification is the module (or diametral pitch), which defines the size and spacing of the teeth. It is expressed in millimeters and must match the pinion for proper meshing.

How does a rack convert rotational motion to linear motion?

When the pinion gear rotates, its teeth engage with the rack's teeth, forcing the rack to move linearly. The direction and distance of movement depend on the pinion's rotation and gear pitch.

What should I verify before purchasing a rack?

Verify the module, tooth profile, material grade, and any applicable standards with the manufacturer or supplier. Also consider load capacity, precision, and environmental conditions for your specific application.

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

Data Basis

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

Preliminary Technical Classification
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