Acorn assembling type nuts and caps are both cap nuts.
Cap nuts are divided into two types according to the production process One is the assembling type: the upper semicircular part is welded, mainly the small cap of cold heading.
The another is one-piece, mainly large-sized red-cut products.
GB /T 802.1 - 2008 Acorn Nuts-Assembling Type
| Legend | Making |
| P=pitch | Carbon Steel:6,8,10,12 |
| K=height of the nut | Thread:6H |
| D=the nominal diameter of the thread | Surface:BLK,ZP,HDG,etc |
| E=The length of the diagonal | |
| S=The length of the flat |