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Hardness class 21H corresponds to a hardness of 210 HV
A2/A4 stainless steel set screws are not specially hardened and may be used for tensile loads.
ISO 4029 replaces DIN 916 | There is some similarity | Nominal diameters for M1.4, M1.8, M14, M18, M22 are removed | Hardness classes for stainless steels introduced.
Select RAL-colour code
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