Double-Ended Lock Cylinder

Double-Ended Lock Cylinders: B2B Engineering & Procurement Guide

Engineered for commercial door assemblies, security partitions, and industrial enclosures, our Double-Ended Lock Cylinders deliver dependable key-operated security from both sides. Built from extruded brass bar stock and precision-machined to strict dimensional tolerances, these cylinders integrate seamlessly into standard Euro-profile mortise locks.

Technical Specifications & Configuration Matrix

Parameter	Specification Detail
Body Material	Solid forged/extruded brass (CuZn39Pb3 / C37700)
Standard Lengths (A/B)	30/30 mm, 35/35 mm, 40/40 mm (Custom asymmetric lengths up to 100 mm available)
Cam Profile	Standard DIN 8-tooth sintered steel cam (positional angle 30 degrees)
Pin Configuration	6-pin precision tumbler mechanism (hardened steel driver pins)
Keyway Types	Euro profile (KW1, SC1, or proprietary restricted profiles upon request)
Finish Options	Satin Nickel Plated (SN), Polished Brass (PB), Satin Chrome (SC), Antique Bronze (AB)
Durability Standard	Tested to Grade 6 (minimum 100,000 cycles) per EN 1303
Corrosion Resistance	Grade 3 (minimum 96 hours neutral salt spray testing)

Dimensional Engineering & Selection Guide

Selecting the correct cylinder length prevents security vulnerabilities and mechanism binding caused by improper protrusion from the door face.

Length Calculation Formula

Total Cylinder Length (L) = Door Thickness + Escutcheon/Rosette Thickness on both sides.
Rule of Thumb: Neither side of the cylinder should protrude more than 2 mm beyond the protective escutcheon plate to prevent physical gripping attacks (wrenching or snapping).

Keying System Options for Projects

Keyed Different (KD): Each cylinder operates with its own unique key set, suited for standard perimeter doors.
Keyed Alike (KA): Multiple cylinders operate using the same key, ideal for multi-door industrial facilities or utility enclosures.
Master Keyed (MK): Hierarchical key system allowing individual room access alongside a single master key for facility management.

Manufacturing, Material & Quality Control

Our manufacturing facility employs vertical integration from raw material extrusion to final pin coding, ensuring strict consistency across large-volume OEM production runs.

Material Integrity: Cylinder housings are CNC-machined from high-purity solid brass bars, eliminating structural porosity common in low-cost die-cast zinc alternatives.

Machining Tolerances: Internal plug-to-shell tolerances are maintained within +/-0.015 mm, ensuring smooth key insertion and preventing premature tumbler wear.

Anti-Pick & Anti-Drill Features: Hardened steel anti-drill pins are press-fitted into the housing face. Mushroom and spool driver pins resist standard picking attempts.

Testing & Inspection Protocol:
Plug Torque Testing: Verifies torsion resistance against forced rotation.
Salt Spray Chamber: Continuous corrosion monitoring to verify plating adhesion and alloy purity.
Optical Comparator Measurement: 100% profile verification for keyway broaching and cam alignment.

Typical Application Scenarios

Commercial Storefronts & Offices

Aluminum and hollow metal entry doors requiring double-key access control.

Industrial Enclosures

Electrical control panels, generator housings, and telecom racks utilizing Euro-profile cutout latch systems.

Institutional Facilities

Schools and healthcare buildings requiring strict adherence to security compartmentation standards.

Supplier Evaluation & Procurement FAQ

Q: What is your standard Minimum Order Quantity (MOQ) for custom-keyed or OEM-branded cylinders?

A: Standard catalog items with KD or KA keying have an MOQ of 500 units. For custom master-key hierarchies or laser-engraved client logos, the MOQ starts at 1,000 units per batch.

Q: How do you handle key code management to prevent unauthorized duplication?

A: All key codes are stored in an encrypted database linked to specific client accounts. Restricted keyway profiles can be established exclusively for your distribution territory, preventing unauthorized key blank replication locally.

Q: What is the standard production lead time for bulk wholesale orders?

A: A: Standard production runs take 30 to 40 days following technical drawing and key chart approval. Expedited manufacturing schedules can be arranged for recurring framework agreements.

Q: Are replacement cams and extension pieces available for modular assembly?

A: Yes. We supply modular extension kits and interchangeable DIN cams upon request for distributors who configure cylinder lengths locally.

Request for Quotation (RFQ) Checklist

To accelerate your quotation process, please provide the following details in your inquiry:

Model & Length

(E.g., Euro Double Cylinder, 35/35 mm)

Finish Requirement

(E.g., Satin Nickel Plated)

Keying Requirement

(KD, KA, or Master Keyed with estimated key chart structure)

Volume

Annual forecast or per-shipment order quantity.

Destination Port

For FOB/CIF freight calculations.

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