Loctite - Keeping Threaded Fasteners in Their Place


The threaded fastener continues to annoy maintenance crews with its tendency to come undone, but solutions do exist
Our thanks to Loctite® for allowing us to reprint the following white paper.
Original version written by Robert A. Valitsky - Technical Manager, Henkel Corporation. Updated by Robert Dunkel, P. Eng - Director of Technical Services, Henkel Corporation

According to a booklet published by the Industrial Fasteners Institute, called 'the Heritage of Mechanical Fasteners', man's invention of nails, rivets, screws and other basic fasteners helped pave the road from the Stone Age to the Space Age. If that is true, then fastener loosing has provided quite a few of the speed bumps and pot holes on that road.


Keeping fasteners tight, particularly the threaded sort, seems like a simple task, but the moving nature of the machinery they are used on is what makes it so troublesome. How nails and rivets work is fairly well known. But because the physics of the threaded fastener is not as well understood, it tends to cause the most problems.


Causes Of Loosening


Threaded fasteners are employed primarily to clamp objects together using tension. Rotary force or torque imposed on the fastener provides that tension. Problems occur when this clamp load deteriorates...


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