---
title: "Shaft Coupling"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:SHAFT_COUPLING"
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source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:SHAFT_COUPLING"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/shaft-coupling.md"
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attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-15 kN·m torque transmission, 0-3000 rpm rotational speed, ±3° angular misalignment, ±5 mm axial misalignment, ±2 mm parallel offset"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 400
    unit: "MPa"
    consequence: "Fatigue failure from cyclic torsional loading following Goodman's criterion, fretting corrosion at spline interfaces, elastomer degradation via Arrhenius equation at elevated temperatures, resonance excitation at critical speeds matching shaft natural frequencies"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Torsional vibration exceeding 25% of nominal torque amplitude at frequencies matching 1x, 2x, or 3x shaft rotational speed"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Torsional vibration dampers with tuned mass absorbers, finite element analysis optimization of stress concentration factors below 2.5, shot peening to induce compressive residual stresses of -300 MPa"
  - node_2:
      trigger: "Lubrication starvation in gear-type couplings causing boundary film thickness below 0.1 μm"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Forced lubrication systems maintaining 2-5 bar oil pressure, surface hardening to 60 HRC minimum, real-time oil debris monitoring with 50 μm particle detection threshold"
bom_nodes:
  hub:
    type: "part"
    urn: "URN:CNFX:ME:HUB"
    interface_type: "physical-logic-coupled"
  flexible-element:
    type: "part"
    urn: "URN:CNFX:ME:FLEXIBLE_ELEMENT"
    interface_type: "physical-logic-coupled"
  fasteners:
    type: "component"
    urn: "URN:CNFX:ME:FASTENERS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/shaft-coupling.md"
on_chain_sovereignty:
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  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Shaft Coupling

## 1. Technical Definition
A mechanical device that connects two shafts together to transmit power and torque while accommodating misalignment.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-15 kN·m torque transmission, 0-3000 rpm rotational speed, ±3° angular misalignment, ±5 mm axial misalignment, ±2 mm parallel offset**. Failure boundary: **Shear stress exceeds 400 MPa for steel couplings, torsional deflection exceeds 0.1 rad/m, temperature exceeds 150°C for elastomeric elements, vibration amplitude exceeds 0.5 mm RMS**, Mechanism: **Fatigue failure from cyclic torsional loading following Goodman's criterion, fretting corrosion at spline interfaces, elastomer degradation via Arrhenius equation at elevated temperatures, resonance excitation at critical speeds matching shaft natural frequencies**.

### 2.1 Analytical Physics Model
Governed by the **L10 Bearing Life & Fatigue Model**:

> **Primary Equation**: $L_{10} = (\frac{C}{P})^p$  
> **Engineering Impact**: Predicts mechanical lifecycle before component fatigue.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| C | Dynamic Load Rating | Engineering Constant |
| P | Equivalent Dynamic Load | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Torsional vibration exceeding 25% of nominal torque amplitude at frequencies matching 1x, 2x, or 3x shaft rotational speed | 8 | Fatigue crack initiation at keyway corners propagating via Paris' law, leading to complete torsional fracture | Torsional vibration dampers with tuned mass absorbers, finite element analysis optimization of stress concentration factors below 2.5, shot peening to induce compressive residual stresses of -300 MPa |
| Lubrication starvation in gear-type couplings causing boundary film thickness below 0.1 μm | 8 | Adhesive wear with material transfer exceeding 0.5 mm depth, followed by scuffing failure with coefficient of friction rising above 0.3 | Forced lubrication systems maintaining 2-5 bar oil pressure, surface hardening to 60 HRC minimum, real-time oil debris monitoring with 50 μm particle detection threshold |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Hub](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/hub.md) `(Standalone System)`
- [Flexible Element](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/flexible-element.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **CNC Lathe**, **Gear Hobbing Machine**, **Dynamic Balancing Machine**  
**Downstream Applications**: Industrial Pumps, Conveyor Systems, Electric Motors  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What materials are best for shaft couplings in corrosive environments?
**A**: Stainless steel shaft couplings offer excellent corrosion resistance for harsh environments, while engineering plastic couplings provide chemical resistance and are lightweight.

### Q: How do shaft couplings accommodate misalignment between connected shafts?
**A**: Shaft couplings use flexible elements within their design to compensate for angular, parallel, and axial misalignment while maintaining efficient power transmission.

### Q: What components are typically included in a shaft coupling BOM?
**A**: A standard shaft coupling bill of materials includes hubs for shaft connection, flexible elements for misalignment compensation, and fasteners for secure assembly.

## 6. Manufacturing Compliance
- ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Shaft Coupling](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/shaft-coupling)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **3** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: SHAFT_COUPLING | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 01d56576
