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Hexagon socket set screw with flattened tip ISO 4027, steel, 45H, zinc-plated, yellow chromated (A2C)
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Hardness class 45H corresponds to a hardness of 450 HV
The standard tip has an angle of 90°, but very short lengths have an angle of 120°.
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.
ISO 4027 replaces DIN 914 | There is some similarity | Nominal diameters for M1.4, M1.8, M14, M18, M22 are removed | Hardness classes for stainless steels introduced.
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