Śruba grub m4 + nakrętka podstawowa De Dietrich 7698472

The grub screw m4 + base nut is a small but vital fastening component used in various boiler and burner assemblies. Grub screws are typically used to secure collars, pulleys, or other rotating parts onto shafts, while the base nut provides additional locking or mounting capability. This M4 size is common in heating equipment, where precise adjustments and secure fittings are required. Whether you are repairing a gas burner or maintaining a boiler, having the correct grub screw and nut ensures that components remain firmly in place under thermal expansion and vibration. This set is a handy addition to any toolkit for boiler spare parts and burner spare parts, allowing for quick replacements during service calls.