Cylinder Plug: Diameter Typically 14-20mm, Tolerance ±0.02mm

Component Specifications

Definition

The cylinder plug is a critical cylindrical component within lock cylinder assemblies that serves multiple functions: it provides the housing for key pins and driver pins, creates a secure seal against contaminants, maintains precise alignment between the cylinder and lock housing, and ensures smooth rotational operation when actuated by the correct key. This component typically features a cylindrical body with precisely machined pin chambers, a keyway opening, and external mounting features that interface with the lock housing.

Working Principle

The cylinder plug operates on the principle of precision cylindrical sealing and rotational guidance. When the correct key is inserted, it aligns the pin stacks within the plug's chambers, allowing the plug to rotate freely within the lock cylinder housing. The plug's cylindrical geometry and tight tolerances create a secure seal that prevents dust, moisture, and other contaminants from entering the lock mechanism while maintaining the precise alignment necessary for smooth key operation and reliable locking/unlocking functions.

Materials

Typically manufactured from brass alloys (C36000, C37700) for corrosion resistance and machinability, stainless steel (304, 316) for high-security applications, or zinc alloys for cost-effective solutions. Material selection depends on security requirements, environmental conditions, and manufacturing considerations.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	30-60mm standard
Diameter	Typically 14-20mm
Hardness	75-85 HRB for brass, 25-35 HRC for steel
Tolerance	±0.02mm
Keyway Type	Standard or proprietary profiles
Pin Chambers	5-7 chambers standard
Surface Finish	Ra 0.8-1.6μm

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

Standards

DIN 18252, ANSI/BHMA A156.5

Parent Products

This component is used in the following industrial products

Lock Cylinder

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.

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Engineering Analysis

Risks & Mitigation

Improper sealing leading to contamination
Wear from repeated rotation causing tolerance loss
Corrosion in harsh environments
Keyway damage from forced entry attempts
Manufacturing defects affecting pin alignment

FMEA Triads

Trigger: Material fatigue from repeated rotational cycles
Failure: Cracking or deformation of the plug body
Mitigation: Use fatigue-resistant materials, implement regular maintenance schedules, design with adequate wall thickness

Trigger: Corrosion due to environmental exposure
Failure: Seizure or binding of the plug within the housing
Mitigation: Select appropriate corrosion-resistant materials, apply protective coatings, implement environmental sealing

Trigger: Manufacturing tolerance stack-up
Failure: Poor key operation or binding
Mitigation: Implement statistical process control, use precision machining equipment, conduct 100% functional testing

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.02mm for critical dimensions, ±0.05mm for non-critical features

Test Method

Dimensional verification via CMM, functional testing with master keys, rotational torque testing, environmental exposure testing per ANSI/BHMA standards

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Cylinder Plug

Manufacturer profiles associated with Cylinder Plug.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of a cylinder plug in a lock mechanism?

The cylinder plug serves three primary functions: it houses the pin tumbler mechanism, provides a secure seal against environmental contaminants, and maintains precise alignment for smooth key operation within the lock cylinder assembly.

Can cylinder plugs be interchanged between different lock brands?

Generally no, as cylinder plugs are designed with brand-specific dimensions, pin chamber configurations, and keyway profiles. However, some standardized systems exist within certain product families or security grades that allow limited interchangeability.

What materials are commonly used for manufacturing cylinder plugs?

Brass alloys are most common due to their excellent machinability and corrosion resistance. Stainless steel is used for high-security applications, while zinc alloys are employed for cost-sensitive applications where extreme durability is not required.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Cylinder Plug