Pin Tumblers (or Wafer Tumblers): Diameter 2.5-3.5mm

Component Specifications

Definition

Pin tumblers, also known as wafer tumblers, are small cylindrical or flat components arranged in a lock cylinder that interact with a key's cuts to align at a shear line, allowing the plug to rotate and operate the locking mechanism. They consist of driver pins, key pins, and sometimes security pins (spool, serrated) that create unique keying combinations and resist picking attempts through precise dimensional tolerances.

Working Principle

When the correct key is inserted, its bitting lifts each pin stack to align precisely at the shear line between the plug and cylinder housing. This alignment removes obstruction, permitting plug rotation to retract the latch or bolt. Incorrect keys leave pins misaligned, blocking rotation through mechanical interference.

Materials

Brass, stainless steel, nickel silver, or hardened steel; often plated with nickel or chrome for corrosion resistance. Security pins may use different materials (e.g., steel inserts) to enhance durability against manipulation.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	5-15mm (varies by position)
Diameter	2.5-3.5mm
Hardness	HRC 40-60 for security pins
Pin Count	5-7 pins (standard), up to 12+ (high-security)
Shear Line Tolerance	±0.05mm

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

Key duplication vulnerabilities
Wear leading to misalignment
Corrosion in harsh environments
Picking or bumping attacks

FMEA Triads

Trigger: Material fatigue or corrosion
Failure: Pin binding or breakage preventing key operation
Mitigation: Use corrosion-resistant materials (stainless steel, brass), apply protective coatings, and implement regular maintenance inspections.

Trigger: Manufacturing tolerance deviations
Failure: Inconsistent shear line alignment causing jamming
Mitigation: Adhere to ISO/DIN standards for dimensional control, implement statistical process control (SPC), and conduct batch testing.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.025mm for high-security applications per ANSI/BHMA standards

Test Method

Cyclic endurance testing (minimum 100,000 cycles), torque resistance testing, and manipulation resistance assessments using standardized picking tools.

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Pin Tumblers (or Wafer Tumblers)

Manufacturer profiles associated with Pin Tumblers (or Wafer Tumblers).

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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 difference between pin tumblers and wafer tumblers?

Pin tumblers are cylindrical and move vertically in a pin chamber, while wafer tumblers are flat and move laterally. Pin tumblers offer higher security with multiple shear lines; wafer tumblers are simpler and used in lower-security applications like cabinet locks.

How do security pins enhance lock protection?

Security pins (spool, serrated, mushroom) create false shear lines and binding points that resist picking tools by causing irregular feedback, making manipulation significantly more difficult compared to standard pins.

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.

Pin Tumblers (or Wafer Tumblers)