---
title: "Shaft/Coupling"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:SHAFTCOUPLING"
  data_integrity_hash: "60d54f8334c3f576dfc6ae832c5cd8df"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:SHAFTCOUPLING"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/shaftcoupling.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/shaftcoupling"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-6000 rpm rotational speed, 0-500 N·m torque transmission"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 250
    unit: "MPa"
    consequence: "Fatigue failure from cyclic torsional loading following Goodman's criterion, fretting corrosion at spline interfaces due to micro-motion under Hertzian contact stresses, resonance-induced vibration at critical speeds matching shaft natural frequencies"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Shaft misalignment exceeding 0.05 mm parallel offset"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Laser alignment during installation with 0.01 mm tolerance, flexible coupling design with 2° angular compensation"
  - node_2:
      trigger: "Torsional vibration at 2× rotational frequency due to mass imbalance"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Dynamic balancing to ISO 1940 G2.5 standard, torsional dampers with 15 N·m·s/rad damping coefficient"
bom_nodes:
  shaft:
    type: "component"
    urn: "URN:CNFX:ME:SHAFT"
    interface_type: "physical-logic-coupled"
  coupling-hub:
    type: "part"
    urn: "URN:CNFX:ME:COUPLING_HUB"
    interface_type: "physical-logic-coupled"
  flexible-element:
    type: "component"
    urn: "URN:CNFX:ME:FLEXIBLE_ELEMENT"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 8821:2018 (SHAFT ENDS FOR COUPLINGS)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/shaftcoupling.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "edb35d67115f47c561a3860af0496058820bbf7925d161f92f1c44b5526c68b8"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Shaft/Coupling

## 1. Technical Definition
Mechanical component that transmits rotational motion and torque between the encoder/sensor and the measured system.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-6000 rpm rotational speed, 0-500 N·m torque transmission**. Failure boundary: **Shear stress exceeding 250 MPa for steel shafts, angular misalignment exceeding 0.5 degrees for couplings, torsional deflection exceeding 0.1 degrees per meter**, Mechanism: **Fatigue failure from cyclic torsional loading following Goodman's criterion, fretting corrosion at spline interfaces due to micro-motion under Hertzian contact stresses, resonance-induced vibration 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 |
| :--- | :--- | :--- | :--- |
| Shaft misalignment exceeding 0.05 mm parallel offset | 8 | Coupling overheating to 150°C due to increased friction, premature bearing wear with 0.01 mm/hour material loss | Laser alignment during installation with 0.01 mm tolerance, flexible coupling design with 2° angular compensation |
| Torsional vibration at 2× rotational frequency due to mass imbalance | 8 | Shaft fatigue crack propagation at 10^-8 m/cycle following Paris' law, coupling bolt shear failure at 400 MPa stress | Dynamic balancing to ISO 1940 G2.5 standard, torsional dampers with 15 N·m·s/rad damping coefficient |

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

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

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

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

### Q: What materials are available for shaft couplings in machinery manufacturing?
**A**: Our shaft couplings are manufactured in stainless steel for corrosion resistance, aluminum alloy for lightweight applications, and carbon steel for high-strength requirements in industrial environments.

### Q: How do shaft couplings transmit motion between encoders and measured systems?
**A**: Shaft couplings mechanically connect rotating components to transmit rotational motion and torque while compensating for minor misalignments, ensuring accurate signal transmission from encoders/sensors to the measured system.

### Q: What are the main components in a shaft coupling assembly?
**A**: The primary BOM components include the coupling hub (connects to shafts), flexible element (absorbs misalignment and vibration), and shaft interface components designed for secure torque transmission in machinery applications.

## 6. Manufacturing Compliance
- ISO 8821:2018 (SHAFT ENDS FOR COUPLINGS)

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

### 🌐 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**: SHAFTCOUPLING | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: c9272fe1
