Industry-Verified Manufacturing Data (2026)

Shaft Assembly

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Shaft Assembly used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Shaft Assembly is characterized by the integration of Shaft Body and Keyway. In industrial production environments, manufacturers listed on CNFX commonly emphasize Stainless Steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A rotating mechanical component that transmits torque and supports rotating elements within a vacuum pump/motor system.

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Product Specifications

Technical details and manufacturing context for Shaft Assembly

Definition
The shaft assembly in a vacuum pump/motor is a critical rotating component that serves as the central structural element connecting the motor to the pump mechanism. It transmits rotational force from the motor to the pump's impeller or rotor, maintains precise alignment of rotating parts, and supports bearings and seals that ensure proper vacuum operation and prevent leakage.
Working Principle
The shaft assembly rotates at high speeds driven by the motor, transferring mechanical energy to the pump's compression mechanism. It maintains rigidity and balance while operating under vacuum conditions, with precise tolerances to minimize vibration and ensure efficient power transmission between the motor and pump sections.
Common Materials
Stainless Steel, Alloy Steel
Technical Parameters
  • Shaft diameter, length, and runout tolerance critical for proper fit and alignment within the pump/motor assembly (mm) Per Request
Components / BOM
  • Shaft Body
    Main structural element that transmits torque and supports rotating components
    Material: Alloy Steel
  • Keyway
    Machined slot for securing impellers, gears, or couplings to prevent slippage
    Material: Same as shaft body
  • Bearing Journals
    Precision-machined surfaces where bearings are mounted to support rotation
    Material: Hardened Steel
  • Seal Surface
    Smooth, polished area where mechanical seals or packing glands create vacuum seal
    Material: Stainless Steel
Engineering Reasoning
0-15000 rpm at 10^-6 to 10^-3 mbar vacuum pressure
Critical speed exceeding 1.2×first natural frequency (e.g., 18000 rpm for 15000 rpm design) or radial deflection >50 μm
Design Rationale: Resonance-induced fatigue fracture at natural frequency nodes or bearing seizure from lubricant breakdown at 120°C
Risk Mitigation (FMEA)
Trigger Misalignment exceeding 0.05 mm/m during assembly
Mode: Whirling vibration amplitude >100 μm at 0.8×operating speed
Strategy: Laser alignment during installation with <0.02 mm/m tolerance and dynamic balancing to G2.5 grade
Trigger Inadequate lubrication film thickness <1 μm at Hertzian contact points
Mode: Bearing temperature rise >40°C above ambient within 30 minutes
Strategy: Forced oil circulation system maintaining 0.5-1.0 bar pressure and 40-60°C oil temperature

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Shaft Assembly.

vacuum pump shaft assembly stainless steel motor shaft rotating shaft for machinery alloy steel bearing journal shaft precision shaft assembly manufacturing

Applied To / Applications

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

Vacuum Pump/Motor
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Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 10 bar (absolute) in vacuum service
other spec: Max rotational speed: 15,000 RPM, Torque capacity: 50 Nm, Vacuum level: 10^-3 mbar
temperature: -40°C to 200°C
Media Compatibility
✓ Dry inert gases (N2, Ar) ✓ Lubricating oils (ISO VG 32-68) ✓ Clean process gases
Unsuitable: Abrasive slurries or particulate-laden fluids
Sizing Data Required
  • Shaft diameter and length
  • Required torque transmission
  • Operating vacuum pressure range

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Fatigue fracture
Cause: Cyclic loading leading to crack initiation and propagation, often at stress concentrators like keyways or fillets, exacerbated by misalignment or improper installation.
Bearing surface wear
Cause: Inadequate lubrication, contamination (e.g., dirt, moisture), or improper bearing fit causing abrasive or adhesive wear, leading to increased clearance and vibration.
Maintenance Indicators
  • Excessive vibration or audible knocking during operation, indicating imbalance, misalignment, or bearing failure.
  • Visible shaft wobble or discoloration (e.g., blueing from overheating) at bearing or seal points, suggesting thermal stress or lubrication issues.
Engineering Tips
  • Implement precision alignment and balancing during installation using laser alignment tools to minimize dynamic stresses and prevent premature fatigue.
  • Establish a rigorous lubrication management program with scheduled oil analysis and contamination control to ensure proper film strength and cleanliness.

Compliance & Manufacturing Standards

Reference Standards
ISO 286-1:2010 (Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes) ANSI B4.1-1967 (Preferred Limits and Fits for Cylindrical Parts) DIN 7184-1 (Shaft-hub connections - Part 1: Press fits)
Manufacturing Precision
  • Shaft diameter: +/-0.01mm (for precision fits)
  • Runout tolerance: 0.05mm (for rotational accuracy)
Quality Inspection
  • Dimensional verification with coordinate measuring machine (CMM)
  • Hardness testing (Rockwell or Brinell scale)

Factories Producing Shaft Assembly

Verified manufacturers with capability to produce this product in China

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✓ 94% Supplier Capability Match Found

P Procurement Specialist from United Arab Emirates Jan 31, 2026
★★★★★
"Found 29+ suppliers for Shaft Assembly on CNFX, but this spec remains the most cost-effective."
Technical Specifications Verified
T Technical Director from Australia Jan 28, 2026
★★★★★
"The technical documentation for this Shaft Assembly is very thorough, especially regarding technical reliability."
Technical Specifications Verified
P Project Engineer from Singapore Jan 25, 2026
★★★★★
"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Shaft Assembly so far."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

8 sourcing managers are analyzing this specification now. Last inquiry for Shaft Assembly from Thailand (1h ago).

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Frequently Asked Questions

What materials are available for this shaft assembly?

Our shaft assemblies are manufactured from high-grade Stainless Steel or Alloy Steel, selected for durability, corrosion resistance, and strength in demanding industrial environments.

What are the key components of this shaft assembly?

The assembly includes a Shaft Body, precision-machined Keyway for secure coupling, Bearing Journals for smooth rotation support, and a Seal Surface to maintain system integrity in vacuum applications.

What is the primary function of this shaft assembly?

This rotating mechanical component transmits torque and provides critical support for rotating elements within vacuum pump and motor systems, ensuring reliable operation in machinery and equipment.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Machinery and Equipment Manufacturing sector.

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