Vis avec rondelle M-4X12 De Dietrich JJJ030005296

This screw with an integrated washer, M4 x 12 mm, is a convenient fastener for boiler and burner components. The pre-attached washer distributes load and reduces the risk of damage to mating surfaces. Ideal for securing covers, brackets, or small parts in heating systems, this screw simplifies assembly and ensures a reliable hold. A practical spare for boiler maintenance and burner repairs, compatible with many applications.