---
title: "Piston/cylinder assembly"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:PISTONCYLINDER_ASSEMBLY"
  data_integrity_hash: "2d77aefa129fe38b1990a7a541a3555d"
  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:PISTONCYLINDER_ASSEMBLY"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/pistoncylinder-assembly.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/pistoncylinder-assembly"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.1-300 bar"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 350
    unit: "bar"
    consequence: "Plastic deformation due to hoop stress exceeding material yield strength (σ_h = P·D/(2t) &gt; σ_yield)"
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 pressure differential monitoring"
  - node_2:
      trigger: "Piston velocity exceeding 0.5 m/s without cushioning"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Integrate deceleration valves with 0.3 m/s² controlled deceleration"
bom_nodes:
  cylinder-tube:
    type: "component"
    urn: "URN:CNFX:ME:CYLINDER_TUBE"
    interface_type: "physical-logic-coupled"
  piston:
    type: "part"
    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"
  end-caps:
    type: "component"
    urn: "URN:CNFX:ME:END_CAPS"
    interface_type: "physical-logic-coupled"
  seals:
    type: "component"
    urn: "URN:CNFX:ME:SEALS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 286-1:2010 (GEOMETRICAL PRODUCT SPECIFICATIONS - LIMITS AND FITS)"
    scope: "Verified Engineering Specification"
  - standard: "ANSI B4.1-1967 (PREFERRED LIMITS AND FITS FOR CYLINDRICAL PARTS)"
    scope: "Verified Engineering Specification"
  - standard: "DIN 7190-1:2017 (INTERFERENCE FITS - CALCULATION AND DESIGN RULES)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/pistoncylinder-assembly.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "06d9e3d815804b854cc9b8cfecd5e1bfd3114cc87a6a410e0afe2af3afbf634f"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Piston/cylinder assembly

## 1. Technical Definition
A mechanical assembly consisting of a piston moving within a cylinder, converting fluid pressure into linear motion.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.1-300 bar**. Failure boundary: **350 bar (yield strength of SAE 1045 steel at 20°C: 530 MPa, with 2.5 safety factor)**, Mechanism: **Plastic deformation due to hoop stress exceeding material yield strength (σ_h = P·D/(2t) &gt; σ_yield)**.

### 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 | Install 10 μm absolute filtration with pressure differential monitoring |
| Piston velocity exceeding 0.5 m/s without cushioning | 8 | Impact damage at stroke ends causing rod bending | Integrate deceleration valves with 0.3 m/s² controlled deceleration |

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

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

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Hydraulic Power Unit**, **Fluid Filtration System**, **Linear Motion Guide System**  
**Downstream Applications**: Hydraulic Presses, Industrial Pumps, Construction Equipment Actuators  

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

### Q: What materials are best for piston/cylinder assemblies in heavy machinery?
**A**: Aluminum alloy offers lightweight strength, stainless steel provides corrosion resistance, and carbon steel ensures durability for high-pressure applications.

### Q: How do I maintain the seals in a piston/cylinder assembly?
**A**: Regularly inspect seals for wear, ensure proper lubrication, and replace them during scheduled maintenance to prevent fluid leaks and maintain efficiency.

### Q: Can piston/cylinder assemblies be customized for specific machinery?
**A**: Yes, assemblies can be tailored with different materials, sizes, and end caps to match exact pressure, temperature, and motion requirements.

## 6. Manufacturing Compliance
- ISO 286-1:2010 (GEOMETRICAL PRODUCT SPECIFICATIONS - LIMITS AND FITS)
- ANSI B4.1-1967 (PREFERRED LIMITS AND FITS FOR CYLINDRICAL PARTS)
- DIN 7190-1:2017 (INTERFERENCE FITS - CALCULATION AND DESIGN RULES)

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

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

> **Reference ID**: PISTONCYLINDER_ASSEMBLY | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 64899ed6
