From YourAssociationWiki
An annular nail is a nail used in pallet construction that has annular threads or teeth along that shaft of the nail that hold it firmly in place. For this reason, it is commonly used with plywood and other heavy materials.[1]
References
- http://www.scglossary.com/glswords.cfm?SearchWord=&SearchCat=15&SearchDetail=0&MaxPerPage=25&pg=1
