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- Made of carbon steel, oxidized black finished, good rust and corrosion resistance. - The pitch and spiral angle of the fine thread is smaller, which is more conducive to the self-locking, so the fine thread are generally used in places where it is necessary to prevent loosening. - Design with thread inside, 4-slot slotted round nut. - Operated with hook spanners (not included here). - Widely used for roller bearing, axial shaft, pump valve, etc. Specification: Material: Carbon Steel Finish: Oxidized black Thread Size: M18x1.5mm Type: Fine Thread Outer Diameter: 31mm / 1.22" Height: 8mm / 0.31" Package Content: 2 x Slotted Nuts