Quarter-turn cam locks are a core component in industrial enclosures, GRP cabinets, machinery covers, metal distribution boxes, and outdoor access systems. One of the greatest advantages of modern enclosure hardware design is the ability to use one universal fixing hole while offering a full range of external lock variations.

At Factory Yard Limited, all of our quarter-turn cam lock external parts are engineered to fit the same 20×22 mm fixing hole, allowing manufacturers to standardise their enclosure cut-outs while providing multiple access and security options.

This approach simplifies production, reduces tooling costs, and offers maximum flexibility to end users.

Universal 20×22 mm Fixing Hole — One Standard for Every Design

The 20×22 mm cut-out is the most widely used standard in enclosure manufacturing.
With this universal size, cabinet producers can keep their panel design unchanged while choosing from different external lock styles based on:

• Customer preference

• Security level

• Application type

• Budget and material requirements

This standardisation significantly reduces engineering time and avoids the need for different punching tools or panel modifications.

External Part Varieties Compatible with the Same Cut-Out

We offer a full selection of external housings and handle designs, all compatible with the same 20×22 mm fixing hole:

1. Countersunk Head

A flat, clean design that sits flush with the surface.
Ideal for sleek panels, machinery covers, and cabinets where appearance and minimal protrusion are important.

2. Regular Head

A classic, universal solution used in most industrial enclosures.
Durable, simple, and suitable for general applications.

3. Locking and Non-Locking Knob

The most user-friendly option, allowing fast access with a simple turn.

• Locking knob includes a key system for added security

• Non-locking knob is ideal for low-security access doors or service panels

4. Locking and Non-Locking T-Handle

Designed for larger cabinet doors that require a firm grip and strong torque.

• Locking T-handle ensures secure closure

• Non-locking T-handle offers a fast, ergonomic opening method

5. Locking and Non-Locking L-Handle

A compact option suitable for tight spaces or small enclosures.

• Locking L-handle is perfect for outdoor or controlled environments

• Non-locking version is used for quick access applications

Why This Variety Matters to Manufacturers

✔ One enclosure design — many customer options

Manufacturers can offer multiple lock styles without changing their cabinet drawings.

✔ Faster production with reduced tooling costs

No need to create or buy extra punching dies for different lock types.

✔ Easy upgrades and replacements

The end user can switch between knob, handle, or countersunk designs without modifications.

✔ Consistent quality and appearance

All components match the same standard, ensuring a clean and uniform look across the product line.

Applications

These quarter-turn solutions are commonly used in:

• GRP outdoor enclosures

• Electrical distribution cabinets

• Metering boxes

• Control panels

• Telecommunications cabinets

• Industrial machinery housings

• Storage compartments and service doors

Any enclosure requiring reliable, compact, and flexible locking options benefits from the 20×22 mm standard.

Conclusion

With a single 20×22 mm fixing hole and a complete range of external part varieties, manufacturers gain total flexibility without complicating their design.
From countersunk heads to locking T-handles, every access style fits the same enclosure platform — saving time, lowering costs, and offering customers more choice.

Factory Yard Limited supplies all variations with high-quality materials, accurate tolerances, and perfectly matched dimensions for industrial-grade performance.