How to Choose the Right Cam Lock Size: 12mm, 16mm, or 19mm ?

Selecting the wrong cam lock size is one of the most common errors in equipment design and procurement. A lock that is too small may not fit the panel cutout or provide adequate engagement depth; a lock that is too large can interfere with adjacent hardware. Choosing correctly requires understanding two independent dimensions: the outer diameter of the lock body, and the body length needed to pass through the panel thickness.

Cam lock sizing is defined by two specifications: outer diameter (OD) — the width of the cylindrical lock body as it passes into the panel hole; and body length — measured from the rear datum face of the lock face to the rear cam attachment position. In functional terms, body length is the fit dimension from the inner panel face to where the fastener engages in the locked position. Jin Tay manufactures cam locks in three standard outer diameters (12mm, 16mm, and 19mm) and four standard body lengths (16mm, 22mm, 28mm, and 34mm); custom dimensions are available for OEM programs.

1. Understanding the Two Critical Dimensions

Outer Diameter (OD): The Panel Cutout Dimension

The outer diameter determines the size of the round hole that must be punched or drilled in the panel, drawer front, or cabinet face. The cutout must precisely match the lock OD — a hole that is too large prevents secure seating; too small prevents insertion.

Jin Tay's three standard outer diameters map to different application scales: 12mm suits compact and light-duty equipment; 16mm covers the broadest range of general commercial and industrial applications; 19mm serves heavy-duty environments and applications requiring anti-vibration performance.

Body (Barrel) Length: The Fit-Function Dimension

Body length is measured from the rear datum face of the lock face to the rear cam attachment position — functionally, the depth from the inner panel face to the point where the fastener engages when locked. The body must be long enough to fully pass through the panel thickness so the retaining nut or clip can be installed on the rear side. If the body is too short, the lock cannot be secured to the panel.

The correct body length is typically calculated as: panel material thickness plus a minimum clearance for the retaining hardware. For thin-panel applications such as sheet metal enclosures, a 16mm body is usually sufficient. Thicker panels, composite drawer fronts, or panels with internal structure require longer bodies — 22mm, 28mm, or 34mm.

2. Selecting the Right Outer Diameter

12mm Cam Locks — Compact, Low-Profile Applications

The 12mm OD is the smallest in Jin Tay's standard range. It suits applications where space around the lock position is limited, or where adjacent hardware requires a minimal-diameter profile.

• Compact electronics enclosures

• Small cabinet doors on instruments and measurement equipment

• Retrofit applications where an existing small cutout dimension is fixed

The 12mm format provides the same mechanical locking principle as larger diameters but with a reduced key and cylinder size. If your application requires a master key system or a high key-combination count, confirm availability in the 12mm format with Jin Tay before finalizing the design specification.

16mm Cam Locks — The General-Purpose Standard

The 16mm OD is the most commonly specified cam lock size across commercial and industrial applications. When the application environment is not fully defined, or one size must cover multiple product SKUs, 16mm is the broadest-coverage choice.

• Filing cabinet drawers and lateral storage

• Mailboxes and postboxes — residential and commercial multi-unit installations

• Office furniture pedestals and mobile cabinets

• Retail display cases and showcase doors

• Network cabinet and server rack access panels

The 16mm OD is compatible with the widest range of cylinder designs, including security disc tumbler cylinders, making it the most flexible choice for programs requiring different security tiers within one product line.

19mm Cam Locks — Heavy-Duty and Anti-Vibration Applications

Specify the 19mm OD when the application requires greater structural strength, a larger key format, or anti-vibration cam lock performance. Jin Tay's anti-vibration cam locks are available exclusively in 19mm — this feature is not available in 12mm or 16mm.

• Industrial equipment cabinets exposed to sustained mechanical vibration — motors, pumps, compressors

• Vending machine doors and coin mechanism panels — vending applications must use 19mm OD

• Heavy storage equipment and equipment transport cases

• Outdoor kiosks and unattended equipment enclosures

3. Application Selection Reference Table

4. Special Considerations

Anti-Vibration: 19mm Only

If the cam lock will be installed on equipment subject to continuous or intermittent mechanical vibration — motors, compressors, pumps, or any equipment with moving internal components — specify an anti-vibration cam lock. Jin Tay's anti-vibration cam locks use a cam and cylinder mechanism that resists self-rotation under vibration load, preventing the lock from loosening or degrading closure over time. Available exclusively in 19mm OD.

Material Selection and Environmental Exposure

The cam lock shell material affects durability and corrosion resistance. Jin Tay offers zinc alloy and stainless steel shells. For indoor, climate-controlled environments, zinc alloy provides adequate service life. For outdoor installations, marine environments, or applications with chemical exposure, specify stainless steel shells.

Key Management: Key Numbers and Master Key Systems

For large deployments where multiple cam locks must be individually keyed, Jin Tay offers individual key numbers scaled by product structure — up to 50,000 key numbers — sufficient to prevent key cross-opening between locks in the same facility. Where the installation requires centralized maintenance management, Jin Tay's master key system allows one master key to manage up to 10,000 individual lock heads — one master key opens the entire equipment area, while each unit retains its own independent operating key.

Frequently Asked Questions

Jin Tay Industries Co., Ltd.  |  sales@jintay.com.tw  |  +886 2 2907 1129  |  www.jintay.com.tw