Editorial Technical Reference

Ignition Lock Assembly

This page explains how Ignition Lock Assembly is classified within Motor Vehicle Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A security and electrical switching mechanism that controls vehicle ignition and accessory power states.

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Product Specifications

Technical details and manufacturing context for Ignition Lock Assembly

Definition
The ignition lock assembly is a critical component of the steering column that integrates mechanical locking with electrical switching functions. It serves as the primary interface for starting the vehicle, controlling power distribution to various systems, and providing anti-theft security through key authentication. The assembly typically consists of a lock cylinder, tumblers, electrical contacts, and a housing. When the correct key is inserted and turned, mechanical tumblers align to allow cylinder rotation, which actuates electrical contacts that switch between OFF, ACC (accessory), ON/RUN, and START positions. This controls power flow to the vehicle's electrical systems and starter motor. The assembly is designed to operate within a voltage range of 12–24 V DC and a current rating of 10–30 A, with contact resistance ≤50 mΩ at 12 V, 10 A, and insulation resistance ≥100 MΩ at 500 V DC. It withstands a dielectric strength of 500 V AC for 1 minute. Operating temperature ranges from -40 to 85 °C, with storage from -40 to 100 °C. Mechanical life is rated at 100,000 cycles, and electrical life at 50,000 cycles at rated current. Key rotation torque is 0.5–1.5 N·m. The assembly offers ingress protection of IP54–IP65. Housing material is zinc-aluminum alloy (Zn-Al alloy) per ASTM B85, and weight is 150–250 g without key. Materials used include zinc alloy, steel, thermoplastic polymers, and copper alloys. These specifications are reference ranges; actual values must be verified with the manufacturer for the specific model and application. The assembly is a component used in motor vehicle manufacturing, and its design and performance should be validated against relevant standards such as ISO 8849, ISO 8820, ISO 6722, ISO 16750, ISO 20653, and IEC 60529. Always confirm model-specific values and standards with the legal manufacturer or supplier.
Working Principle
When the correct key is inserted and turned, mechanical tumblers align to allow cylinder rotation. This rotation actuates electrical contacts that switch between OFF, ACC (accessory), ON/RUN, and START positions, controlling power flow to the vehicle's electrical systems and starter motor. The mechanical locking mechanism prevents unauthorized operation, while the electrical switching ensures proper power distribution. The assembly is designed to operate within specified voltage, current, and temperature ranges, and its mechanical and electrical life are rated for repeated use. The key rotation torque is within a specified range to ensure reliable operation. The assembly's ingress protection rating indicates its resistance to dust and water, and the housing material provides corrosion resistance.
Common Materials
Zinc alloy, Steel, Thermoplastic polymers, Copper alloys
Technical Parameters
ParameterTypical rangeNotes & selection driver
Operating Voltage12–24 V DCStandard automotive electrical systemISO 8849
Current Rating10–30 AFor starter and accessory circuitsISO 8820
Contact Resistance≤50 mΩAt 12 V, 10 AISO 6722
Insulation Resistance≥100 MΩAt 500 V DCISO 8849
Dielectric Strength500 V ACFor 1 minuteISO 8849
Operating Temperature-40–85 °CExtended range for extreme climatesISO 16750
Storage Temperature-40–100 °CNon-operationalISO 16750
Mechanical Life100000 cyclesKey insertions and rotationsISO 20653
Electrical Life50000 cyclesAt rated currentISO 20653
Torque0.5–1.5 N·mKey rotation torqueISO 20653
Ingress ProtectionIP54–IP65Dust and water resistanceIEC 60529
Housing MaterialZn-Al alloyCorrosion resistantASTM B85
Weight150–250 gWithout key

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Lock Cylinder
    Accepts and verifies key, provides mechanical rotation
    Material: Zinc alloy
  • Electrical Switch Module
    Controls power distribution to vehicle systems based on key position
    Material: Thermoplastic housing with copper contacts
  • Mounting Bracket Part
    Secures assembly to steering column structure
    Material: Steel
  • Tumbler Set
    Provides security by requiring specific key cuts for operation
    Material: Brass or steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Ignition Lock Assembly.

Ignition Switch Assembly Ignition Cylinder Assembly Steering Column Lock

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Steering Column
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: N/A (mechanical/electrical component)
other spec: 12V or 24V DC electrical system, 30A max current rating
temperature: -40°C to 85°C
Media Compatibility
✓ Automotive cabin air environment ✓ Standard automotive electrical systems ✓ Key-based mechanical interfaces
Unsuitable: High-vibration industrial machinery (exceeds automotive vibration specs)
Sizing Data Required
  • Vehicle ignition system voltage (12V/24V)
  • Steering column diameter and mounting interface
  • Key tumbler configuration and security requirements

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Wear-induced binding
Cause: Accumulation of debris, lack of lubrication, or mechanical wear of internal components (e.g., tumblers, springs) leading to increased friction and resistance during key insertion or rotation.
Electrical contact degradation
Cause: Corrosion, oxidation, or pitting of electrical contacts within the lock cylinder or switch assembly, resulting in intermittent or complete loss of electrical continuity for ignition signaling.
Maintenance Indicators
  • Audible grinding or scraping noise during key insertion or rotation
  • Intermittent or delayed engine cranking despite proper key positioning
Engineering Tips
  • Implement periodic cleaning and lubrication with manufacturer-approved dry graphite or silicone-based lubricants to reduce internal friction and prevent debris accumulation.
  • Install protective covers or seals to shield the lock cylinder from environmental contaminants (moisture, dust, road salt) that accelerate corrosion and wear.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 11446:2012 (Road vehicles - Connectors for electrical systems) ANSI/SAE J1128 (Low Voltage Primary Cable) DIN 72551 (Terminals for electrical connections in motor vehicles)

Quoted from the published standard.

Manufacturing Precision
  • Keyway alignment: +/-0.5° angular tolerance
  • Electrical contact resistance: <0.01 ohms at rated current
Quality Inspection
  • Torque-to-turn test for mechanical operation
  • Dielectric withstand voltage test (500V AC for 60 seconds)

Manufacturers of Ignition Lock Assembly

Manufacturer profiles associated with Ignition Lock Assembly.

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Frequently Asked Questions

What is the operating voltage range of the ignition lock assembly?

The operating voltage range is 12–24 V DC, as per ISO 8849. However, this is a reference range; the actual voltage rating for a specific model must be confirmed with the manufacturer.

What is the mechanical life of the ignition lock assembly?

The mechanical life is rated at 100,000 cycles (key insertions and rotations) per ISO 20653. This is a reference value; the actual endurance may vary by model and should be verified with the supplier.

What ingress protection does the ignition lock assembly have?

The assembly has an ingress protection rating of IP54–IP65 per IEC 60529, indicating resistance to dust and water. The exact rating for a specific product should be confirmed with the manufacturer.

What materials are used in the ignition lock assembly?

The assembly uses zinc alloy, steel, thermoplastic polymers, and copper alloys. The housing material is zinc-aluminum alloy (Zn-Al alloy) per ASTM B85. Material grades and specifications should be verified with the manufacturer.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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