The nut is nuts and bolts or screw screwed together for fastening parts, all manufacturing machinery must use an element according to the different materials, divided into carbon steel, stainless steel, non-ferrous metals (such as copper) and other major types.

The main nut attributes based on GB (GB), German standard (DIN), international standard (ISO), Japanese standard (JIS), American Standard (ASTM/ANSI) standard. Among them, GB, DIN, JIS M (e.g. M8, M16), American, British, scores or # said specifications (such as 8#, 10#, 1/4, 3/8).

The nut is connected to mechanical equipment parts, through the inside of the thread, the same specifications of nuts and bolts to connect together, such as M4-P0.7 and M4-P0.7 only bolt nut series connection (nut, M4 nut diameter is about 4mm, 0.7 fingers between the two thread distance of 0.7mm); US made products as well, such as screw nut only with the 1/4-20 1/4-20's collocation (1/4 refers to the nut inner diameter is about 0.25 inches, 20 inches each, 20 teeth).

Easy to install, integrity, without washers, convenient disassembly and reuse, carbon steel, and 8.8 grade, 10.9 grade high strength bolts and other work, through the United States Military - MIL-STD 1312 Vibration Test7.Results was detected by Junker Test assay, Test detection by Dynamic