For stainless steel screw hard or iron screw hard, this is mainly depends on what the stainless steel screw material, there is to see what level of the iron screw. Stainless steel screws have 201,304,316. The strength grades of iron screws are 4.8, 8.8, 10.9, and 12.9 grade. To distinguish this clearly, the problem of stainless steel screws or hard screws is solved. However, this question is actually very unreasonable. It is not as good as hardness. For hardness, the best way is to pass the hardness tester and test the hardness of the stainless steel screw and the hardness of the iron screw at the same time. The test results should be compared.
This depends on what screw the screw is. What screw is the 304 stainless steel screw? For low-strength stainless steel screws, for example, bolts below 4.8 are 304 stainless negative screws with good hardness. For bolts higher than grade 5.8 to 8.8 For non-high-strength 304 screws, the hardness of iron screws is high. For high-strength 304 screws, 304 screws have high hardness. For screws of class 8.8 and above, the hardness of iron screws is high.