Square combination locks are widely used for securing personal and commercial belongings due to their reliability and ease of use. The performance and durability of these locks largely depend on the materials used in their construction, which affect strength, resistance to tampering, and overall lifespan.

The body of most square combination locks is commonly made from metals such as zinc alloy, brass, or stainless steel. Zinc alloy is lightweight and resistant to corrosion, making it a practical choice for portable locks. Brass offers good corrosion resistance and durability, while stainless steel provides higher strength and long-term wear resistance, especially in environments exposed to moisture or temperature fluctuations.

The shackle, which is the part that loops through the secured object, is often made of hardened steel. This material choice enhances the lock’s resistance to cutting, sawing, or bending. Some models may feature a nickel or chrome plating on the shackle, improving both corrosion resistance and aesthetic appearance.

Internal components, including the dial, wheels, and locking mechanism, are typically made from brass, steel, or durable polymers. Brass is favored for its machinability and smooth operation, while steel ensures structural strength. Polymers are sometimes used in budget models to reduce weight and manufacturing costs without significantly compromising function.

The materials used in square combination locks are carefully selected to balance durability, security, and ease of use. By combining corrosion-resistant metals, hardened steel shackles, and well-designed internal components, manufacturers provide locks that are reliable, functional, and long-lasting. Understanding these material choices helps users appreciate how square combination locks maintain consistent performance in a variety of settings.

https://www.keeperlock.com/product/brass-padlock/bb600-double-groove-straight-open-brass-padlock.html
ART. NO.    SIZE
BB630    30mm
BB640    40mm
BB650    50mm
BB660    60mm
BB630L    30mm long shackle
BB640L    40mm long shackle