---
title: "Main Boom"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:MAIN_BOOM"
  data_integrity_hash: "3b330f0790fc411131b171ff66c600ed"
  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:MAIN_BOOM"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/main-boom.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/main-boom"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-90 degrees from horizontal, 0-100% rated load capacity (e.g., 0-500 metric tons)"
    unit: "m"
engineering_limits:
  max_safe_operating_point:
    value: 572
    unit: "Grade"
    consequence: "Euler-Bernoulli beam theory failure due to combined bending moment (M) and torsional shear stress (τ) exceeding σ_yield = √(σ_bending² + 3τ²) at stress concentration points near pinned connections"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Cyclic loading at 0.5-2 Hz exceeding 1×10⁶ cycles at 80% yield stress"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Post-weld heat treatment to 600°C for stress relief and ultrasonic testing at 2-5 MHz frequency"
  - node_2:
      trigger: "Lateral wind loading exceeding 20 m/s during extension beyond 70% length"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Real-time strain gauge monitoring at 100 Hz sampling with automatic retraction at 85% σ_yield"
bom_nodes:
  boom-foot-pin:
    type: "component"
    urn: "URN:CNFX:ME:BOOM_FOOT_PIN"
    interface_type: "physical-logic-coupled"
  boom-tip-head:
    type: "component"
    urn: "URN:CNFX:ME:BOOM_TIP_HEAD"
    interface_type: "physical-logic-coupled"
  lattice-members-for-lattice-booms:
    type: "component"
    urn: "URN:CNFX:ME:LATTICE_MEMBERS_FOR_LATTICE_BOOMS"
    interface_type: "physical-logic-coupled"
  telescopic-sections-for-telescopic-booms:
    type: "part"
    urn: "URN:CNFX:ME:TELESCOPIC_SECTIONS_FOR_TELESCOPIC_BOOMS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 12100:2010 - SAFETY OF MACHINERY"
    scope: "Verified Engineering Specification"
  - standard: "ANSI B30.5-2018 - MOBILE AND LOCOMOTIVE CRANES"
    scope: "Verified Engineering Specification"
  - standard: "DIN EN 13001-2:2014 - CRANE SAFETY - GENERAL DESIGN"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/main-boom.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "13544684877242d22d09dcaeeda0265466a34e953d5d04f6ef4b09b38289c16b"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Main Boom

## 1. Technical Definition
The primary load-bearing structural arm of a crawler crane that extends to position and lift loads.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-90 degrees from horizontal, 0-100% rated load capacity (e.g., 0-500 metric tons)**. Failure boundary: **Yield stress of ASTM A572 Grade 50 steel (345 MPa) at critical weld joints under combined bending and torsional loading**, Mechanism: **Euler-Bernoulli beam theory failure due to combined bending moment (M) and torsional shear stress (τ) exceeding σ_yield = √(σ_bending² + 3τ²) at stress concentration points near pinned connections**.

### 2.1 Analytical Physics Model
Governed by the **Frame Structural Deflection Analysis**:

> **Primary Equation**: $\delta = \frac{5 q L^4}{384 E I}$  
> **Engineering Impact**: Ensures structural stability for multi-stage machines.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| q | Uniform Load | Engineering Constant |
| E | Elastic Modulus | Engineering Constant |
| I | Moment of Inertia | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Cyclic loading at 0.5-2 Hz exceeding 1×10⁶ cycles at 80% yield stress | 8 | Fatigue crack propagation from weld toe at boom base connection | Post-weld heat treatment to 600°C for stress relief and ultrasonic testing at 2-5 MHz frequency |
| Lateral wind loading exceeding 20 m/s during extension beyond 70% length | 8 | Lateral-torsional buckling with critical load P_cr = (π²EI)/(KL)² where K=2.0 for cantilever | Real-time strain gauge monitoring at 100 Hz sampling with automatic retraction at 85% σ_yield |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Telescopic Sections (for telescopic booms)](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/telescopic-sections-for-telescopic-booms.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Crawler Crane Chassis**, **Hydraulic Power Unit**, **Load Monitoring System**  
**Downstream Applications**: Heavy Construction Projects, Wind Turbine Installation, Bridge Construction  

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

### Q: What are the key differences between lattice and telescopic main booms?
**A**: Lattice booms use interconnected steel members for lightweight strength at extreme lengths, while telescopic booms feature nested sections that extend hydraulically for faster setup and compact transport.

### Q: How do I determine the right steel grade for my crane's main boom?
**A**: Select steel grades like ASTM A572 or A514 based on required yield strength, weldability, and fatigue resistance. Consult manufacturer specifications and consider load capacity, environmental conditions, and regulatory standards.

### Q: What maintenance is critical for main boom longevity?
**A**: Regular inspections for cracks, corrosion, and wear at connection points; proper lubrication of pins and joints; monitoring alignment and straightness; and following manufacturer load charts to prevent overloading.

## 6. Manufacturing Compliance
- ISO 12100:2010 - SAFETY OF MACHINERY
- ANSI B30.5-2018 - MOBILE AND LOCOMOTIVE CRANES
- DIN EN 13001-2:2014 - CRANE SAFETY - GENERAL DESIGN

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Main Boom](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/main-boom)**

### 🌐 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**: MAIN_BOOM | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 996fd857
