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★MroMax M55 Retaining Four-Slot Slotted Round Nuts used for roller bearing, axial shaft, pump valve, etc. ★【Feature】 ☁ 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】 ☁ Product Name: Slotted Nuts ☁ Brand: MroMax ☁ Material: Carbon Steel ☁ Finish: Oxidized black ☁ Thread Size: M55 x 2mm ☁ Thread pitch : 2mm /0.08 " ☁ Outer Diameter: 78mm/ 3.07" ☁ Height: 12mm /0.47 " ☁ Thread standard (metric system/imperial system, etc.): Metric system ★【Package Content】 ☁ 2 x Slotted Nuts