An eye lifting nut is a fastener that is tightly screwed onto a threaded rod or bolt. It is an essential fastener for all production tools and manufacturing machinery. The lower part of an eye lifting nut is equipped with screw threads. Manufacturers can drill holes according to different specifications and fix the nut using the screw port.

In general, only eye lifting nuts and corresponding screws of the same specification can be connected and used in a matched set, as the internal threads of eye lifting nuts also come in different specifications. The fitting often used with eye lifting nuts is an external threaded stud, and together they are used to lift various types of equipment. This article mainly introduces the production standards for eye lifting nuts.

The production standard for eye lifting nuts is JB/T 7382, which specifies the internal thread specifications of eye lifting nuts as M8-M100*6. This standard also references other fastener production standards, such as GB 90 for fastener acceptance, marking and packaging standards; GB 196 for basic dimensions of general threads, which specifies that the diameter range of eye lifting nuts is 1mm-600mm; GB 197 for tolerances and fits of general threads of eye lifting nuts, which specifies that the diameter tolerance range is only 1mm-355mm; GB 230 for Rockwell hardness test method of metals; GB 699 for technical requirements for quality carbon structural steels; GB 1237 for marking method of fasteners; GB 5267 for electroplated coatings on threaded fasteners; and GB 6394 for methods for measuring average grain size of metals.