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Slotted set screw with tip DIN 553, steel, 14H, zinc-plated, blue passivated (A2K)
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Hardness class 14H corresponds to a hardness of 450 HV
Steel set screws are intended for use under compressive stress only (see also DIN EN ISO 898-5). Typical uses include clamping in an adjusting ring or applying pressure to a counterpart. Steel set screws are therefore extremely hard in order to ensure torsional strength in the hexagon socket during tightening/loosening.
Tip:
A2/A4 stainless steel set screws are not specially hardened and may be used for tensile loads.
DIN 553 has been withdrawn and replaced by ISO 7434. There is some similarity (nominal diameter for M1, M1.4 removed).
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