Shape of the links

For a chain lock, the main factors that determine the level of security are the thickness, the material, and the shape of the links. Below you can find the key differences.

Link Shape

Round Links

Advantages:

• Evenly distribute force across the material.
• Lower risk of stress concentration and breakage under normal use.

Disadvantages:

• Often easier to grip with pliers or bolt cutters.
• Can roll under tool pressure, sometimes making cutting easier.

Square or Rectangular Links

Advantages:

• More compact shape, making tool placement more difficult.
• Flat surfaces make clamping harder.
• At equal thickness, often better resistance to bending and twisting.

Disadvantages:

• Corners may become stress points under extreme load, especially with lower-quality steel.

Hexagonal Links

Advantages:

• Harder to cut thanks to angles and flat surfaces.
• Higher rigidity and better resistance to twisting.
• Do not roll away under tool pressure.

Disadvantages:

• If the steel is not hardened, corners may become weak points.
• More complex production process, often resulting in a higher price.

Conclusion

For maximum security, choose a chain lock with hardened steel links, sufficient thickness, and a shape that resists cutting and twisting.