The high anti-corrosion stainless steel screws are made of an innovative material and techniques, which gives the advantages of high anti-corrosion, tensile strength and durability.
In comparison to the traditional bi-metal screws, the manufacturing processes are way less complicated and more eco-friendly.
After years of experiements and development, the HAC S.S Screw can be tested under 3,000+ hrs salt spray test(SST) and 30+ cycles acid rain test; which is equal to a 30 years(and more!) anti-corrsion effect under real enoiornment.
An innovative solution for the tradition bi-metal screws, save your time from replacing the rusty screws and work costs!
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High Anti-rust Stainless Steel Screw
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Traditional Bi-metal Screw |
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Manufacturing Process |
1. Forging
2. Heat treatment
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1. Forging (top-stainless steel)
2. Forging (bottom-carbon steel)
3. Welding (to combine the top & bottom)
4. CNC & threading process
5. Ultrasonic cleaning
6. Heat treatment
7. Surface treatment
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Hardness |
surface-550 HV
core-520 Hv Min
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210-250 HV |
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Tensile Strength |
173 kgf/mm²
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70.7 kgf/mm²
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Surface Treatment |
N/A |
Required |
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Anti-rust Effect(SST) |
above 3,000hrs |
240hrs-1,000hrs(after surface treatment) |
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Acid Rain Prevention |
30-50 cycles |
N/A |
