mainly for connection, assembly, fixing, and other functions. * 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. Carbon Steel Hardware Kit Square Nuts, M4x9mmx3mm Zinc-Plated Metric Coarse Thread Assortment Kit 25pcs 18mm X 4mm Square Nuts Specification:Material: Carbon steelGrade: 4., 8Thread Size: M5 x 0., 8mmEdge width:18mm/0., 7Height: 4mm/0., 16Package Content: 25 Pcs x Square NutsNotice for Choosing the Stainless Steel Type?The stainless steel is not absolutely rustless. uxcell Square Nuts, M4x13mmx3mm Zinc-Plated Metric Coarse Thread Assortment Kit, 25 Pcs · M4x13mmx3mm. ₹3,178.00₹3,178.00 · M5x12mmx2mm. ₹2,666.00₹2,666.00 [THREADED SIZE] - M5 x 0., 8mm., [DIMENSION] - 0., 7(18mm) wide, 0., 16(4mm) high. * For the indoor decoration or furniture, stainless steel 201 or 304 (SUS201, SUS 304) can be used. [Application]- It suitable for indoor and outdoor, widely used in civil furniture, equipment, construction, electrical appliances, industrial machinery, etc. * To bear the big load, carbon steel is a good choice. It is just rust-proof in the proper condition. uxcell 200Pcs M5x18mmx4mm Square Nuts, Carbon Steel Zinc Square nuts are designed for use with square-headed bolts, though they can also be used with some machine screws. These are nicely centered 6mm threaded holes, 20mm square. They are suitable for use in channel mounts. Not sure what that other review is for, but it was... [How to use] - Usually use screws to clamp the connected terminal wire; use a wrench to fix the square nut, and use a drive tool to lock the screw in the tightening position.
