---
title: "Hinge Joints"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:HINGE_JOINTS"
  data_integrity_hash: "457c9250c2e8c112db5f6be949371325"
  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:HINGE_JOINTS"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/hinge-joints.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/hinge-joints"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-180 degrees rotational freedom, 15-45 N·m torque transmission, 0.1-0.5 mm radial clearance"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 250
    unit: "MPa"
    consequence: "Fatigue failure due to cyclic Hertzian contact stress at pin-bushing interface exceeding 1500 MPa, fretting wear at mating surfaces with relative motion amplitude &gt;50 μm"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Insufficient lubrication causing boundary lubrication regime with coefficient of friction &gt;0.15"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Forced lubrication system with 0.5 L/min flow rate at 2 bar pressure and MoS2 additive concentration of 3% by weight"
  - node_2:
      trigger: "Cyclic bending moment exceeding 120 N·m at 2 Hz frequency causing stress concentration factor of 2.8 at fillet radius"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Shot peening surface treatment inducing 400 MPa compressive residual stress layer of 0.3 mm depth and radius optimization to maintain stress concentration factor &lt;1.5"
bom_nodes:
  hinge-pin:
    type: "component"
    urn: "URN:CNFX:ME:HINGE_PIN"
    interface_type: "physical-logic-coupled"
  clevis:
    type: "component"
    urn: "URN:CNFX:ME:CLEVIS"
    interface_type: "physical-logic-coupled"
  bushingsbearings:
    type: "component"
    urn: "URN:CNFX:ME:BUSHINGSBEARINGS"
    interface_type: "physical-logic-coupled"
  retaining-mechanism:
    type: "component"
    urn: "URN:CNFX:ME:RETAINING_MECHANISM"
    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/hinge-joints.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "a6784b38aba6bc4017d6f71ac402bdb09b15e50e97df31a28cc0ea015e165a2c"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Hinge Joints

## 1. Technical Definition
Mechanical joints that allow rotational movement between connected boom sections.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-180 degrees rotational freedom, 15-45 N·m torque transmission, 0.1-0.5 mm radial clearance**. Failure boundary: **Shear stress exceeding 250 MPa in pin material, radial clearance exceeding 1.2 mm, angular misalignment exceeding 3 degrees**, Mechanism: **Fatigue failure due to cyclic Hertzian contact stress at pin-bushing interface exceeding 1500 MPa, fretting wear at mating surfaces with relative motion amplitude &gt;50 μm**.

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Insufficient lubrication causing boundary lubrication regime with coefficient of friction &gt;0.15 | 8 | Accelerated adhesive wear leading to 0.8 mm radial clearance increase within 500 operating hours | Forced lubrication system with 0.5 L/min flow rate at 2 bar pressure and MoS2 additive concentration of 3% by weight |
| Cyclic bending moment exceeding 120 N·m at 2 Hz frequency causing stress concentration factor of 2.8 at fillet radius | 8 | Fatigue crack initiation at pin root with propagation rate of 10^-8 m/cycle leading to fracture within 10^6 cycles | Shot peening surface treatment inducing 400 MPa compressive residual stress layer of 0.3 mm depth and radius optimization to maintain stress concentration factor &lt;1.5 |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **CNC Machining Center**, **Heat Treatment Furnace**, **Coordinate Measuring Machine**  
**Downstream Applications**: Excavator Booms, Crane Arms, Agricultural Equipment Linkages  

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

### Q: What materials are used in these hinge joints?
**A**: Our hinge joints are manufactured from high-strength alloy steel for maximum durability and load-bearing capacity in industrial applications.

### Q: What components are included in the hinge joint assembly?
**A**: Each hinge joint assembly includes bushings/bearings, clevis, hinge pin, and retaining mechanism for complete rotational functionality.

### Q: What types of machinery use these hinge joints?
**A**: These hinge joints are designed for machinery and equipment manufacturing applications where rotational movement between connected boom sections is required, such as in construction equipment and material handling systems.

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

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Hinge Joints](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/hinge-joints)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **4** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: HINGE_JOINTS | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 1571d2d2
