---
title: "Lock Cylinder"
industry: "Motor Vehicle Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:LOCK_CYLINDER"
  data_integrity_hash: "c3738b1b2073c80cef6d85e9c4f50e14"
  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:LOCK_CYLINDER"
  data_source_uri: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/lock-cylinder.md"
  official_resource_url: "https://cnfx.com/industry/motor-vehicle-manufacturing/product/lock-cylinder"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-2.5 N·m torque, -40°C to 85°C temperature, 0-100% relative humidity"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 150
    unit: "MPa"
    consequence: "Plastic deformation of brass tumblers due to cyclic torsional loading exceeding yield strength of 125 MPa, abrasive wear at key-contact surfaces with coefficient of friction &gt;0.3"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Accumulated particulate contamination (ISO 4406 Class 19/17/14) in keyway"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Integrate labyrinth seal with 25 μm clearance and positive-pressure purge system at 0.1 bar"
  - node_2:
      trigger: "Corrosion-induced galvanic potential &gt;200 mV between brass tumblers and steel housing"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Apply 25 μm electroless nickel-phosphorus coating with salt spray resistance &gt;500 hours per ASTM B117"
bom_nodes:
  cylinder-housing:
    type: "part"
    urn: "URN:CNFX:ME:CYLINDER_HOUSING"
    interface_type: "physical-logic-coupled"
  cylinder-plug:
    type: "component"
    urn: "URN:CNFX:ME:CYLINDER_PLUG"
    interface_type: "physical-logic-coupled"
  pin-tumblers-or-wafer-tumblers:
    type: "component"
    urn: "URN:CNFX:ME:PIN_TUMBLERS_OR_WAFER_TUMBLERS"
    interface_type: "physical-logic-coupled"
  tailpiece-or-cam:
    type: "component"
    urn: "URN:CNFX:ME:TAILPIECE_OR_CAM"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/lock-cylinder.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "b1558dd4e55735e74b2785b5f9cb66d09de7ff3c29673c48f43a95387c56ef9f"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Lock Cylinder

## 1. Technical Definition
A mechanical component within an ignition lock assembly that houses the keyway and tumblers, enabling key insertion and rotation to engage/disengage the lock mechanism.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-2.5 N·m torque, -40°C to 85°C temperature, 0-100% relative humidity**. Failure boundary: **Shear stress exceeding 150 MPa at tumbler pins, angular displacement &gt;3° from neutral position, surface roughness Ra &gt;1.6 μm in keyway**, Mechanism: **Plastic deformation of brass tumblers due to cyclic torsional loading exceeding yield strength of 125 MPa, abrasive wear at key-contact surfaces with coefficient of friction &gt;0.3**.

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Accumulated particulate contamination (ISO 4406 Class 19/17/14) in keyway | 8 | Increased rotational resistance exceeding 4.0 N·m, preventing key extraction | Integrate labyrinth seal with 25 μm clearance and positive-pressure purge system at 0.1 bar |
| Corrosion-induced galvanic potential &gt;200 mV between brass tumblers and steel housing | 8 | Tumbler seizure at shear interface, requiring &gt;15 N·m breakaway torque | Apply 25 μm electroless nickel-phosphorus coating with salt spray resistance &gt;500 hours per ASTM B117 |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Cylinder Housing](https://cnfx.com/llms/industry/fabricated-metal-product-manufacturing/product/cylinder-housing.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **CNC Machining Center**, **Key Cutting Machine**, **Tumbler Pin Assembly Station**  
**Downstream Applications**: Ignition Lock Assembly, Door Lock Assembly, Steering Column Lock Assembly  

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

### Q: What materials are used in your lock cylinders for motor vehicles?
**A**: Our lock cylinders are manufactured using premium materials including zinc alloy for corrosion resistance, brass for durability, and steel for high-security applications, ensuring long-lasting performance in automotive environments.

### Q: How does the lock cylinder integrate with the ignition system?
**A**: The lock cylinder houses the keyway and tumblers, allowing proper key insertion and rotation. When turned, it activates the tailpiece or cam to engage or disengage the ignition lock mechanism, enabling vehicle starting or securing.

### Q: What are the main components in your lock cylinder BOM?
**A**: Our lock cylinder bill of materials includes the cylinder housing, cylinder plug, pin tumblers (or wafer tumblers for specific models), and tailpiece (or cam), all precision-engineered for reliable operation in motor vehicle manufacturing.

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

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Lock Cylinder](https://cnfx.com/industry/motor-vehicle-manufacturing/product/lock-cylinder)**

### 🌐 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**: LOCK_CYLINDER | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: cc6aa81f
