Products

RUSPERT outperforms traditional DACROMET in acid rain resistance and environmental friendliness under conventional outdoor conditions, thanks to its chrome-free composite structure; while DACROMET remains irreplaceable in terms of high-temperature stability and zero hydrogen embrittlement. Malaxy’s RUSPERT-coated products offer a cost-effective anti-corrosion solution for large-scale international projects.

Fasteners are the silent backbone of every mechanical assembly, yet many engineers and buyers oversimplify them as just “screws.” In reality, selecting the wrong type – a bolt instead of a screw, a flat washer instead of a spring washer, or a low-grade stud for a high-vibration joint – can lead to premature failure, safety risks, and unnecessary maintenance costs.This guide breaks down the technical distinctions between screws, bolts, nuts, washers, expansion anchors, and threaded rods. It covers thread engagement principles, preload generation, anti-loosening strategies, and material-grade matching (from carbon steel to alloy steel, Grades 4.8 to 12.9).With over 20 years of fastener supply chain experience and a manufacturing base in Haiyan, Jiaxing – China’s leading fastener production hub – Shanghai Malaxy Co., Ltd. delivers these categories to more than 70 countries. Understanding fastener types isn’t just basic knowledge; it’s the first step toward safer， longer‑lasting.

Fastener corrosion resistance is often reduced to a single number: “salt spray test hours.” But why does a bolt that passes 1,000 hours in the lab sometimes rust much sooner in the field? Salt spray testing (ISO 9227) is a fast, repeatable accelerated corrosion method. However, lab conditions cannot replicate real-world factors: temperature swings, humidity cycles, mechanical stress, chemical exposure, and galvanic coupling between dissimilar metals. These variables determine actual service life. Experienced engineers never treat salt spray results as an absolute life guarantee. Instead, they use the test as a comparative quality control tool – to verify batch consistency, compare coatings, and determine pass/fail against defined requirements. True reliability comes from a complete quality management system, not a single test report. Key takeaway: Do not chase the highest hour number. Ask: Which standard? How are results interpreted? Does the coating match your environment? read more.