uxcell M4 Square Nuts 304 Stainless Steel Metric Coarse Thread Assortment Kit 50 Pcs

- Made of 304 Stainless Steel , good rust and corrosion resistance. - Square head, female threaded inside. - Widely used with fasteners for industrial machine, - Allow your works to accomplish work faster and more efficient. Specification: Material: 304 Stainless steel Grade: A2-70 Thread Size: M4x0.7mm Edge width: 7mm / 0.28" Height: 3mm / 0.12" Package Content: 50(+/-2%) x Square Nuts Notice 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 the 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, the carbon steel is a good choice. Its finish can be Zinc plating or paint coating, varying in the environmental conditions.