Lock Cylinder for Ignition Lock Assembly

Product Specifications

Technical details and manufacturing context for Lock Cylinder

Definition

The lock cylinder is the core security component of an ignition lock assembly, typically mounted within the steering column or dashboard. It contains a precisely machined keyway that accepts the vehicle's unique key profile, along with a series of pin tumblers or wafer tumblers that must align when the correct key is inserted. This alignment allows the cylinder plug to rotate, which in turn actuates the ignition switch mechanism to start the vehicle. It serves as the primary anti-theft device by preventing unauthorized key operation. The cylinder is manufactured from materials such as zinc alloy, brass, or steel, with common grades including Zamak 5 for the housing and 304 stainless steel for tumblers. Key parameters include a cylinder diameter of 16–22 mm, length of 30–50 mm, keyway tolerance of ±0.05 mm (ISO 2768-m), tumbler spring force of 1.5–3.0 N, operating temperature range of -40 to 85 °C (ISO 16750-4), torque resistance of at least 15 N·m (ISO 20653), hardness of 45–55 HRC (ASTM E18), surface finish of Ra 0.8–1.6 μm (ISO 1302), and weight of 20–40 g. These values are reference ranges and must be verified for the specific vehicle model and application. The lock cylinder is designed to fit standard ignition lock housings, and its dimensions and tolerances ensure proper fit and function. It is a critical component in motor vehicle manufacturing, contributing to vehicle security and operational reliability. When selecting or replacing a lock cylinder, it is essential to confirm compatibility with the vehicle's ignition system and key profile. Always consult the legal manufacturer or supplier for model-specific specifications and standards compliance.

Working Principle

When the correct key is inserted into the keyway, its cuts or ridges lift the pin tumblers (or align wafer tumblers) to a precise shear line between the cylinder plug and outer housing. This alignment allows the plug to rotate freely within the housing. The rotation is mechanically transferred (often via a tailpiece or cam) to the ignition switch, changing its electrical state (OFF/ACC/ON/START). Without the correct key, the misaligned tumblers bind the plug to the housing, preventing rotation.

Common Materials

Zinc Alloy, Brass, Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Cylinder Diameter	16–22 mm	Fits standard ignition lock housings
Cylinder Length	30–50 mm	Depends on vehicle model
Keyway Tolerance	±0.05 mm	Ensures smooth key insertionISO 2768-m
Tumbler Spring Force	1.5–3.0 N	Affects key turn resistance
Operating Temperature	-40–85 °C	Exceeds range may cause jammingISO 16750-4
Torque Resistance	≥15 N·m	Prevents forced rotationISO 20653
Hardness	45–55 HRC	Balances wear resistance and machinabilityASTM E18
Material Grade	Zamak 5 / 304 SS	Zamak for housing, SS for tumblersASTM B240 / A276
Surface Finish	Ra 0.8–1.6 μm	Smooth finish reduces wearISO 1302
Weight	20–40 g	Varies with size and material

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

Cylinder Housing
The outer shell that houses the plug and tumblers, provides mounting points, and resists forced entry.

Material: Zinc Alloy or Steel
Cylinder Plug Part
The inner rotating core that contains the keyway. It rotates when the correct key aligns the tumblers.

Material: Brass or Nickel-Silver Alloy
Pin Tumblers (or Wafer Tumblers) Part
Small precision components (driver pins, key pins, springs, or wafers) that block rotation unless lifted/aligned by the correct key cuts.

Material: Brass, Steel, Phosphor Bronze
Tailpiece (or Cam) Part
The mechanical linkage that transfers rotation from the cylinder plug to the ignition switch actuator.

Material: Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Lock Cylinder.

Applied To / Applications

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

Ignition Lock Assembly

View system integration details

Manufacturers of Lock Cylinder

Manufacturer profiles associated with Lock Cylinder.

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Frequently Asked Questions

What materials are commonly used for lock cylinders?

Common materials include zinc alloy, brass, and steel. Typical grades are Zamak 5 for the housing and 304 stainless steel for tumblers, as listed in the directory.

What are the typical dimensions of a lock cylinder?

The cylinder diameter typically ranges from 16 to 22 mm, and length from 30 to 50 mm, depending on the vehicle model. These are reference ranges; verify exact dimensions for your application.

What standards apply to lock cylinder parameters?

Standards referenced include ISO 2768-m for keyway tolerance, ISO 16750-4 for operating temperature, ISO 20653 for torque resistance, ASTM E18 for hardness, and ISO 1302 for surface finish. These are verification references, not proof of compliance.

How does the lock cylinder prevent unauthorized operation?

The cylinder contains tumblers that must align to a shear line when the correct key is inserted. Without the correct key, the tumblers bind the plug to the housing, preventing rotation and thus preventing unauthorized ignition operation.

Data Basis

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

Preliminary Technical Classification

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pressure:	N/A (mechanical component)
other spec:	Key insertion force: 2-5 N, Rotation torque: 0.5-2 Nm
temperature:	-40°C to +85°C

Lock Cylinder

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards