ringlock nail

ringlock nail

[′riŋ‚läk ‚nāl]
(design engineering)
A nail ringed with grooves to provide greater holding power.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

ring-shank nail

A nail having a number of ring-like grooves around the shank to increase its holding power.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.