Hello, I'm a bit of a beginner in this area, but I'm hoping someone here has a better understanding of how this works. What I want to do is get a handle on which hardness class all the screws have, in order to sort them more effectively internally. However, I've encountered some problems at work finding the information about the screws.
The first type of screw I have is a set screw with hex socket and cup point, made of stainless acid-proof steel according to ISO 4029. The datasheet I have for the screws includes M2, M3, M4, M5, M6, M8, M10, M12 screws, all made of material A4 according to ISO 3506-3.
ISO 3506-3 tells me that it will have either a "hardness class" of 12H or 21H, but the datasheet doesn't mention either "Vickers hardness" or "hardness class."
My question then is how should I proceed with the information I have to find out what hardness class to categorize the screw as?
I know the screws are sourced from Bulten, but I haven't been able to find information on their website regarding the hardness they use. According to the purchasing spec I have, the manufacturer's article number is, for example, ISO 4029-M10X16-A4. Is my only option to call Bulten (or Bufab as I've understood they're now called) and ask them, or is there a way to determine the hardness with the information I have?
I have more similar screws but from other manufacturers, and I have roughly the same information. However, I can wait with those in case I find out that it's not possible here either.
I would be very grateful if someone could help me get a grasp on this!
Best regards,
Daniel
The first type of screw I have is a set screw with hex socket and cup point, made of stainless acid-proof steel according to ISO 4029. The datasheet I have for the screws includes M2, M3, M4, M5, M6, M8, M10, M12 screws, all made of material A4 according to ISO 3506-3.
ISO 3506-3 tells me that it will have either a "hardness class" of 12H or 21H, but the datasheet doesn't mention either "Vickers hardness" or "hardness class."
My question then is how should I proceed with the information I have to find out what hardness class to categorize the screw as?
I know the screws are sourced from Bulten, but I haven't been able to find information on their website regarding the hardness they use. According to the purchasing spec I have, the manufacturer's article number is, for example, ISO 4029-M10X16-A4. Is my only option to call Bulten (or Bufab as I've understood they're now called) and ask them, or is there a way to determine the hardness with the information I have?
I have more similar screws but from other manufacturers, and I have roughly the same information. However, I can wait with those in case I find out that it's not possible here either.
I would be very grateful if someone could help me get a grasp on this!
Best regards,
Daniel
You talk about both strength class and hardness, which are not the same thing. The strength class indicates the screw material's yield strength and tensile strength and is specified as, for example, 4.6 or 10.9. Hardness is measured with a method (Rockwell, Vickers, Brinell) and is more to be seen as a comparison number (even though there are numerous formulas to calculate yield strength based on hardness).