---
title: "Actuator Piston"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:ACTUATOR_PISTON"
  data_integrity_hash: "45564fc93d60af301dcadb07e1b90496"
  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:ACTUATOR_PISTON"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/actuator-piston.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/actuator-piston"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "5-350 bar hydraulic pressure, -40°C to 120°C temperature, 0.01-2.5 m/s linear velocity"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 450
    unit: "MPa"
    consequence: "Hydraulic fluid cavitation at vapor pressure threshold (0.02 bar absolute), thermal expansion mismatch causing galling at 150°C delta-T, Hertzian contact stress exceeding 1.5 GPa at seal interface"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Hydraulic fluid contamination exceeding ISO 4406 18/16/13 cleanliness level"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Install 3 μm absolute filtration with differential pressure monitoring at 2 bar"
  - node_2:
      trigger: "Piston rod misalignment exceeding 0.05 mm/mm angular deviation"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Integrate spherical rod end bearings with ±3° angular compensation"
bom_nodes:
  piston-head:
    type: "component"
    urn: "URN:CNFX:ME:PISTON_HEAD"
    interface_type: "physical-logic-coupled"
  piston-rod:
    type: "component"
    urn: "URN:CNFX:ME:PISTON_ROD"
    interface_type: "physical-logic-coupled"
  sealing-rings:
    type: "component"
    urn: "URN:CNFX:ME:SEALING_RINGS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 6432:2015 (PNEUMATIC FLUID POWER - SINGLE ROD CYLINDERS, 8 TO 25 MM BORES)"
    scope: "Verified Engineering Specification"
  - standard: "ANSI/B93.5M-1981 (HYDRAULIC FLUID POWER - CYLINDERS)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/actuator-piston.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "652a6029e2100a785aaae0d4dbcf0a538420fe5aa902828b541a8dc551bcc03d"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Actuator Piston

## 1. Technical Definition
A cylindrical component within hydraulic actuators that converts hydraulic pressure into linear mechanical motion.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **5-350 bar hydraulic pressure, -40°C to 120°C temperature, 0.01-2.5 m/s linear velocity**. Failure boundary: **Material yield strength exceeded at 450 MPa (steel) or 250 MPa (aluminum), seal failure at 400 bar pressure differential, piston rod buckling at 15:1 slenderness ratio**, Mechanism: **Hydraulic fluid cavitation at vapor pressure threshold (0.02 bar absolute), thermal expansion mismatch causing galling at 150°C delta-T, Hertzian contact stress exceeding 1.5 GPa at seal interface**.

### 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 exceeding ISO 4406 18/16/13 cleanliness level | 8 | Abrasive wear of piston seal grooves exceeding 0.1 mm clearance | Install 3 μm absolute filtration with differential pressure monitoring at 2 bar |
| Piston rod misalignment exceeding 0.05 mm/mm angular deviation | 8 | Asymmetric side loading causing seal extrusion failure at 1000+ cycles | Integrate spherical rod end bearings with ±3° angular compensation |

## 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**: **Hydraulic Power Unit**, **Hydraulic Cylinder Test Bench**, **CNC Lathe**  
**Downstream Applications**: Excavator Arm, Industrial Press, Aircraft Landing Gear  

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

### Q: What materials are best for actuator pistons in corrosive environments?
**A**: Stainless steel actuator pistons offer superior corrosion resistance for harsh environments, while aluminum alloy provides lightweight options with good corrosion resistance for less demanding applications.

### Q: How do I maintain the sealing rings on an actuator piston?
**A**: Regular inspection for wear, proper lubrication with compatible hydraulic fluids, and ensuring clean hydraulic systems prevent premature sealing ring failure. Replace rings at recommended intervals or when leaks occur.

### Q: What factors determine the lifespan of an actuator piston?
**A**: Lifespan depends on material quality, operating pressure, alignment, maintenance frequency, and environmental conditions. Hardened steel pistons typically last longest in high-pressure industrial applications.

## 6. Manufacturing Compliance
- ISO 6432:2015 (PNEUMATIC FLUID POWER - SINGLE ROD CYLINDERS, 8 TO 25 MM BORES)
- ANSI/B93.5M-1981 (HYDRAULIC FLUID POWER - CYLINDERS)

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

### 🌐 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**: ACTUATOR_PISTON | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: f754da3c
