precote 5 • 3M 4291 sealing coat for external and internal threads … Field of application Product features These sealing agents, which are composed largely of mineral filling agents and lubricants on a dispersion basis, are used for precoating processes in many applications in the automotive, appliance and mechanical engineering industries for sealing screw unions. • Maximum sealing action against gases and most aqueous and nonaqueous fluids. The coatings, which are dried after application, react neither with the coated thread nor the mating thread: This makes later releasing and retightening of the screw joint unproblematical. Furthermore, the base material of the thread is not restricted to metallic materials. The dried surface is stable and nonsticky, meaning that longer storage periods at room temperature prior to final use for installation are possible without the need for any additional precautions. The good resistance level of the layers to a large number of gases, aqueous and non-aqueous fluids as well as high pressure levels also at temperatures up to +180°C results in an extremely wide range of application for users of this type of pre-coated threaded component. For special applications precote 4, 9 and 15 available on request. 22 • Depending on the material and configuration of the thread coupling, connections offer a reliable seal even up to pressure levels as high as 50 bar. • The threaded component and sealing element are inseparably connected, excluding the possibility of costly secondary installation operations due to forgotten or lost seals. • Economical due to large-series coating and capacity for the use of automatic installation equipment. • Saves on inventory management, storage and installation of additional sealing elements.

... technologies for a reliable hold External and internal thread coating precote 5 3M 4291 with dispersion layer Thread seal Application Standard coating external For the manufacture of ready-toinstall, sealing screws and threaded components from M3. Works Standard 926 - 929 B1 ≈ A, 360° all round. Around 2 to 3 thread turns remain uncoated to ease the screwing action (B2). A B1 B2 B B Standard coating internal 360° all round. Around 2 to 3 thread turns remain uncoated to ease the screwing action. B F A precote 5 3M 4291 Headed screws 926 ... ... 500 928 ... ... 500 Studs 927 ... ... 500 929...