Left-hand screw | Article about left-hand screw by The Free Dictionary
left-hand screw[′left ¦hand ′skrü]
A screw that advances when turned counterclockwise.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive
'Chirality is observer-independent; no matter how one looks at a right-hand screw thread, it remains different from a left-hand screw
(This whole scenario is reversed for a left-hand screw
Remember, do not touch the left-hand screws
or you will lose your adjustment on the first scope.