How To Choose The Right Cam Lock Size: 12mm, 16mm, Or 19mm?

Selecting the wrong cam lock size is one of the most common mistakes in equipment design and procurement. A lock that is too small may not fit the panel cutout or may not provide adequate engagement. One that is too large may interfere with surrounding hardware or structural elements. Getting the size right requires understanding two independent measurements: the outer diameter of the lock body and the shank (body) length required to clear the panel thickness.

Cam lock sizing is defined by two dimensions: the outer diameter (OD) — the width of the cylindrical housing as it enters the panel hole — and the body length — the depth of the lock body measured from the face to the rear cam attachment point. Jin Tay manufactures cam locks in three standard outer diameters (12mm, 16mm, and 19mm) and four standard body lengths (16mm, 22mm, 28mm, and 34mm), with custom dimensions available for OEM programs.

1. Understanding the Two Key Measurements

Outer Diameter (OD): The Panel Hole Size

The outer diameter determines the size of the circular hole that must be cut or drilled in the panel, drawer front, or cabinet face to accept the cam lock body. The hole must match the OD precisely — too large and the lock will not seat securely; too small and the lock body cannot be inserted.

The three standard ODs in the Jin Tay cam lock range correspond to different application scales: 12mm for compact and lightweight equipment, 16mm for the broadest range of general commercial and industrial applications, and 19mm for heavy-duty environments or where anti-vibration performance is required.

Body (Shank) Length: Panel Thickness Clearance

The body length determines how deep the lock body extends into and through the panel. The body must be long enough to protrude through the full panel thickness so that the nut or retaining clip on the rear can be fitted. If the body is too short, it 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. For thicker panels, drawer fronts with built-up construction, or installations with internal structure behind the face, longer body lengths (22mm, 28mm, or 34mm) are required.

2. Choosing the Right Outer Diameter

12mm Cam Locks — Compact, Low-Profile Applications

The 12mm outer diameter is the smallest in the Jin Tay standard range. It suits applications where the mounting panel has limited real estate around the lock position or where the adjacent hardware geometry requires a minimal-diameter profile.

• Compact electronic equipment enclosures

• Small cabinet doors on instrumentation and measurement equipment

• Retrofit applications where existing hole patterns are fixed at small dimensions

The 12mm format provides the same mechanical locking principle as larger diameters but with a reduced key and cylinder size. For applications requiring a master key program or high key combination count, confirm key availability at 12mm with Jin Tay prior to design specification.

16mm Cam Locks — General-Purpose Standard

The 16mm outer diameter is the most widely specified cam lock size across commercial and industrial applications. It represents the best-coverage option when the application environment is not yet fully defined or when a single size must span multiple product SKUs.

• Filing cabinet drawers and lateral storage units

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

• Office furniture credenzas and storage pedestals

• Retail display cases and showcase doors

• Network and server rack access panels

The 16mm diameter allows for a wider range of cylinder designs — including security disc tumbler configurations — making it the most flexible option for programs that require tiered security across different units in the same product family.

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

The 19mm outer diameter is specified where the application requires greater structural robustness, a larger key format, or specifically where anti-vibration cam lock performance is needed. Jin Tay's anti-vibration cam lock models are available exclusively in 19mm — this is not a feature available at 12mm or 16mm.

• Industrial equipment cabinets subject to continuous mechanical vibration (motors, pumps, compressors)

• Vending machine doors and coin mechanism panels — 19mm is the required diameter for vending machine cam lock applications

• Heavy-duty storage units and equipment transport cases

• Outdoor kiosks and unattended equipment enclosures

3. Application Selection Reference Table

The following table provides a cross-reference of common applications against recommended cam lock outer diameters and body lengths:

4. Special Considerations

Anti-Vibration: 19mm Only

If the cam lock will be installed in equipment that is subject to continuous or intermittent mechanical vibration — motors, compressors, pumps, or any equipment with moving internal components — specify the anti-vibration cam lock model. Anti-vibration cam locks from Jin Tay are designed with a cam and plug mechanism that resists self-rotation under vibrational load, preventing the lock from working itself open or compromising the closure over time.

Material Selection and Environmental Exposure

Cam lock housing material affects both durability and corrosion resistance. Jin Tay offers zinc alloy and stainless steel housings. For indoor, climate-controlled environments, zinc alloy provides adequate service life. For outdoor installations, marine environments, or applications involving chemical exposure, stainless steel housing is the appropriate specification.

Key Management: 50,000 Key Numbers and Master Key Programs

For large deployments where multiple cam locks must be individually keyed, Jin Tay's key number range of up to 50,000 options provides enough unique assignments to prevent cross-keying across a facility. For installations requiring centralized maintenance access, Jin Tay's master key program supports up to 500 individual lock heads per master key — meaning one master key can operate an entire equipment bay while each unit retains its unique change key.

Frequently Asked Questions

A: Residential and commercial mailbox installations standardly use 16mm outer diameter cam locks. The body length depends on the panel thickness of the mailbox door — typically 16mm or 22mm body length covers the majority of standard mailbox constructions. For multi-unit commercial mailbox arrays with thicker panel construction, confirm the door panel thickness before specifying body length.

A: The 16mm outer diameter is the most widely specified cam lock size across commercial and industrial applications. It covers the broadest range of applications — filing cabinets, mailboxes, office furniture, retail fixtures, and server rack panels — and is available in the widest selection of cylinder designs including standard and security disc tumbler configurations.

A: Yes. Jin Tay manufactures cam locks with custom body lengths for OEM programs where the standard 16mm, 22mm, 28mm, and 34mm options do not fit the panel specification. Custom body lengths are available through direct inquiry. Contact the Jin Tay team with your panel thickness measurement and the outer diameter requirement to receive a specification recommendation.

A: Outer diameter (OD) is the width of the circular lock body — it determines the hole size that must be cut in the panel. Body length is the depth of the lock body from the face to the rear where the cam and retaining hardware attach — it must be long enough to pass completely through the panel so the locking nut or clip can be fitted on the reverse side. Both measurements are independent and must be specified correctly for a cam lock to fit and function properly.

A: Yes. Jin Tay manufactures cam locks in 12mm, 16mm, and 19mm outer diameters across a range of body lengths, cylinder designs (standard and security), key systems, and materials. OEM customization is available for diameter, body length, cam rotation (90 or 180 degrees), material, and key program configuration. Contact the Jin Tay team or request the product catalog for a full specification overview.