Bekaert صمولة M4 مطلية بالنيكل خاصة

This is a nickel-plated M4 nut of a special design. Nuts of this size are common fasteners in burner and boiler assemblies, used to secure components such as ignition electrodes, flame sensing probes, pressure switch terminals, or cover plates onto threaded studs. The M4 thread diameter is typical for smaller electrical and mechanical connections inside control boxes or on flame safeguard units. The nickel plating provides corrosion resistance in environments where condensation or flue gas exposure may occur. When replacing a nut of this type, ensure the thread pitch matches the stud – M4 fasteners are available in standard (0.7 mm) pitch, but a "special" designation may indicate a non-standard form (e.g. reduced height, serrated flange, or specific torque limit). Always confirm that the nut seats squarely and that the clamping force suits the component being held; overtightening can crack ceramic electrode bases or damage thin mounting brackets. For electrically sensitive parts, a nickel-plated steel nut offers adequate conductivity, but if the original was brass or stainless steel, verify compatibility with the adjacent materials to avoid galvanic corrosion.