---
title: "Piston Rod/Cylinder"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:PISTON_RODCYLINDER"
  data_integrity_hash: "5c2be7addb26f31c459b4daffa8e663d"
  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:PISTON_RODCYLINDER"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/piston-rodcylinder.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/piston-rodcylinder"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-25 MPa hydraulic pressure, -40°C to 120°C temperature"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 4140
    unit: "steel"
    consequence: "Fatigue crack propagation from cyclic stress concentration at rod-cylinder interface due to pressure-induced bending moments exceeding material endurance limit (σ_e = 207 MPa for 4140 steel)"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Hydraulic fluid contamination with 15 μm+ particles"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Install 10 μm absolute filtration with differential pressure monitoring at 0.7 bar threshold"
  - node_2:
      trigger: "Misalignment exceeding 0.05 mm/m between rod and cylinder axes"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Integrate laser-aligned mounting surfaces with 0.02 mm/m tolerance and spherical rod ends"
bom_nodes:
  cylinder-barrel:
    type: "part"
    urn: "URN:CNFX:ME:CYLINDER_BARREL"
    interface_type: "physical-logic-coupled"
  piston:
    type: "component"
    urn: "URN:CNFX:ME:PISTON"
    interface_type: "physical-logic-coupled"
  piston-rod:
    type: "component"
    urn: "URN:CNFX:ME:PISTON_ROD"
    interface_type: "physical-logic-coupled"
  rod-seal:
    type: "component"
    urn: "URN:CNFX:ME:ROD_SEAL"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 6432:2015 (MINIATURE PNEUMATIC CYLINDERS)"
    scope: "Verified Engineering Specification"
  - standard: "ANSI/B93.5M-1985 (HYDRAULIC FLUID POWER - CYLINDERS)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/piston-rodcylinder.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "e170b7eb2624a4821feb7f00b48396b7fb6f6304ceea2bbba3417f11d71cb400"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Piston Rod/Cylinder

## 1. Technical Definition
The piston rod and cylinder assembly that converts hydraulic or pneumatic pressure into linear motion within an oscillation actuator.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-25 MPa hydraulic pressure, -40°C to 120°C temperature**. Failure boundary: **Yield strength of 4140 steel (415 MPa) exceeded at rod surface, cylinder wall stress &gt; 250 MPa, seal temperature &gt; 150°C**, Mechanism: **Fatigue crack propagation from cyclic stress concentration at rod-cylinder interface due to pressure-induced bending moments exceeding material endurance limit (σ_e = 207 MPa for 4140 steel)**.

### 2.1 Analytical Physics Model
Governed by the **Thin-Wall Pressure Vessel Stress Analysis**:

> **Primary Equation**: $\sigma_h = \frac{P \cdot D}{2t}$  
> **Engineering Impact**: Determines the hoop stress boundary to prevent rupture.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| P | Internal Pressure | Engineering Constant |
| D | Diameter | Engineering Constant |
| t | Wall Thickness | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Hydraulic fluid contamination with 15 μm+ particles | 8 | Seal extrusion and scoring of cylinder bore surface (Ra &gt; 0.8 μm) | Install 10 μm absolute filtration with differential pressure monitoring at 0.7 bar threshold |
| Misalignment exceeding 0.05 mm/m between rod and cylinder axes | 8 | Asymmetric wear pattern on rod surface (&gt;0.1 mm depth) leading to hydraulic fluid bypass | Integrate laser-aligned mounting surfaces with 0.02 mm/m tolerance and spherical rod ends |

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

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

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Hydraulic Power Unit**, **Pneumatic Compressor System**, **Linear Motion Guide System**  
**Downstream Applications**: Industrial Robotic Arms, Packaging Machinery, Construction Equipment Actuators  

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

### Q: What materials are available for piston rod and cylinder assemblies?
**A**: Our assemblies are manufactured using chrome-plated steel for durability, stainless steel for corrosion resistance, and aluminum alloy for lightweight applications in machinery and equipment manufacturing.

### Q: What are the main components in a piston rod/cylinder assembly?
**A**: The key components include the cylinder barrel, piston, piston rod, and rod seal, which work together to convert hydraulic or pneumatic pressure into precise linear motion within oscillation actuators.

### Q: How do I select the right piston rod and cylinder for my machinery?
**A**: Consider your operating pressure, environmental conditions, required precision, and material compatibility. Chrome-plated steel offers excellent wear resistance, stainless steel is ideal for corrosive environments, and aluminum alloy provides weight savings for dynamic applications.

## 6. Manufacturing Compliance
- ISO 6432:2015 (MINIATURE PNEUMATIC CYLINDERS)
- ANSI/B93.5M-1985 (HYDRAULIC FLUID POWER - CYLINDERS)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Piston Rod/Cylinder](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/piston-rodcylinder)**

### 🌐 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**: PISTON_RODCYLINDER | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 6509b234
