INDUSTRY COMPONENT

Spacer/Shim

Precision spacer or shim used in preload mechanisms to control axial clearance and maintain proper bearing tension.

Component Specifications

Definition
A precision-engineered thin component inserted between mechanical parts in preload mechanisms to establish and maintain precise axial spacing, eliminate unwanted clearance, and ensure optimal bearing preload. It compensates for manufacturing tolerances and thermal expansion while preventing excessive friction or slack in rotating assemblies.
Working Principle
Works by occupying a specific dimensional gap between components to establish precise axial positioning. In preload mechanisms, it creates controlled compression on bearings or gears, eliminating axial play while maintaining optimal load distribution. The thickness determines the exact preload force applied to prevent backlash and vibration.
Materials
Typically made from hardened steel (AISI 52100, 440C), stainless steel (304, 316), brass, bronze, or engineered polymers (PTFE, PEEK). Thickness ranges from 0.05mm to 3mm with surface finishes of Ra 0.4-1.6μm.
Technical Parameters
  • Flatness ≤0.015mm
  • Hardness 45-60 HRC (steel)
  • Parallelism ≤0.01mm
  • Surface Finish Ra 0.4-1.6μm
  • Temperature Range -40°C to +200°C (standard materials)
  • Thickness Tolerance ±0.005mm to ±0.025mm
Standards
ISO 286-2, DIN 988, ISO 1101

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Spacer/Shim.

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Incorrect thickness causing over-preload and bearing failure
  • Material fatigue under cyclic loading
  • Corrosion in harsh environments
  • Improper installation causing misalignment
FMEA Triads
Trigger: Incorrect thickness selection
Failure: Excessive preload leading to bearing overheating and premature failure
Mitigation: Use precision measurement tools and follow manufacturer's preload specifications
Trigger: Material degradation
Failure: Loss of dimensional stability under load
Mitigation: Select materials with appropriate hardness and corrosion resistance for the application environment
Trigger: Improper installation
Failure: Misalignment causing uneven load distribution
Mitigation: Follow torque specifications and use alignment tools during assembly

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Geometric tolerances per ISO 1101, dimensional tolerances per ISO 286-2
Test Method
Coordinate measuring machine (CMM) verification, surface roughness testing per ISO 4287, hardness testing per ISO 6508

Buyer Feedback

★★★★☆ 4.7 / 5.0 (19 reviews)

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Spacer/Shim so far."

"Testing the Spacer/Shim now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

Related Components

Inspection Frame
Structural support component in automated fabric inspection systems that holds cameras, sensors, and lighting for defect detection.
Machine Frame
The rigid structural foundation of a CNC wood router that provides stability, vibration damping, and precision alignment for cutting operations.
pH Sensor Assembly
Precision pH sensor assembly for automated monitoring and dosing systems in industrial applications
Load Cell Assembly
Precision load cell assembly for automated powder dispensing systems

Frequently Asked Questions

What is the difference between a spacer and a shim in preload mechanisms?

Spacers maintain fixed distances between components, while shims are adjustable thickness components used for fine-tuning preload. In preload mechanisms, shims are often used to achieve exact bearing compression.

How do I select the correct thickness for a preload shim?

Measure the axial gap with precision gauges, then select a shim thickness that provides 0.002-0.015mm interference fit for ball bearings, or follow manufacturer's preload specifications for specific bearing types.

Can shims be stacked to achieve desired thickness?

Yes, but stacking increases tolerance stack-up and may reduce stability. Single-piece shims are preferred for critical preload applications to maintain parallelism and reduce interface points.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Get Quote for Spacer/Shim

Spacer Ring Sparks/Debris Baffle (optional)