Sifang mother, hardware equipment, fastening accessories.
Shape is square, with internal thread, can be used with bolts.
Also known as the square nut.
Sifang mother mostly USES various embossed wire production (generally lead brass, such as H59, 3604, 3602) produced from, also has stainless steel, alloy material.
The welding standards are GB/T 13681-1992 and GB/T 13680-1992.
