uxcell Square Nuts, M6x15mmx4mm Zinc-Plated Metric Coarse Thread Assortment Kit, 25 Pcs

Description:These square nuts have a 4-sided, square design which provides a greater bearing surface when installing. Square nuts are designed for use with square-headed bolts, though they can also be used with some machine screws. The large surface provides better resistance to loosening. Also used with flat washers of compatible size and material.Specification:Material: Carbon steelGrade: 4.8Thread Size: M6 x 1mmEdge width:15mm/0.59"Height: 4mm/0.16"Package Content: 25 Pcs x Square NutsNotice for Choosing the Stainless Steel Type?The stainless steel is not absolutely rustless. It is just rust-proof in the proper condition.* For the indoor decoration or furniture, stainless steel 201 or 304 (SUS201, SUS 304) can be used. But Type 201 should only be kept in dry condition.* For the outdoor condition with the polluted air, in the extremely humid environment, or somewhere with salty vapor, such as by sea or swimming pool, Type 316 or 316L should apply.* To bear the big load, carbon steel is a good choice. Its finish can be Zinc plating or paint coating, varying in the environmental conditions.