Double Fold Self Locking Small Washers

By applying treatment to the surface of the Double Fold Self Locking small Washers, it can withstand various harsh environments. Its anti-corrosion and temperature resistance properties far exceed those of traditional methods.

（1）Composite zinc-aluminum coating

Widely used in scenarios with high anti-corrosion requirements. Through multiple layers of stacking and high-temperature curing, the process is complex and the cost is high, but it has excellent comprehensive corrosion resistance and temperature resistance, and is in line with the environmental protection trend.

（2）Galvanizing / Electro-galvanizing

The most common basic treatment, with the lowest cost and diverse appearances (such as white zinc, yellow zinc), but with average corrosion resistance, and there is a risk of hydrogen embrittlement. It is often used in ordinary industrial environments.

（3）Blackening

The process is simple and the cost is low, but the rust prevention ability is usually weak. The blackened Double Fold Self Locking small Washers are commonly used on internal components that require high cleanliness but do not pay much attention to rust prevention.

（4）Chroming

It can provide high hardness and mirror-like luster, but the cost is relatively high.

（5）Original color / Uncoated

Only applicable to stainless steel Double Fold Self Locking small Washers (such as 304/316). It relies on the material's own corrosion resistance and is mainly used in harsh corrosive environments such as marine and chemical industries.

Choice of surface treatment

Choosing the right surface finish for Double Fold Self Locking small Washers is key to making them last and work reliably.

（1）If you want solid all-round performance, go for zinc-aluminum composite coating. It holds up over 1000 hours in salt spray testing, and won’t cause hydrogen embrittlement issues.

（2）For standard working conditions and keeping costs low, regular galvanizing is a good pick. Just be aware of its real rust resistance lifespan, and the possible risk of hydrogen embrittlement in application.

（3）If the environment is highly corrosive or high temperature, 304 or 316 stainless steel is a practical option, whether with extra coating or not.

（4）For specific functional needs: phosphating keeps torque steady, so it’s commonly used with high-strength bolt sets. Black oxide finish is mainly for visual effect and basic short-term rust protection.