6.6.1 Threadlockers

Threadlockers are 1C liquid adhesives that completely fill the gaps between interfacing threads on nuts-and-bolts assemblies; the liquid resin changes its liquid state into solid by the contact of metal and the absence of air (anaerobic), creating an interfacial connection to prevent any loosening of the threads. It is essential that the effective length of the thread is wetted and that there is no surface contamination in the curing of the adhesive.

Figure 186 Threadlocker between the interfacing threads of a nut and bolt

Different formulas for threadlocker adhesives are available and these are classified by the torque value: removable, semi-permanent, permanent and some special characteristics like wicking grade, semi-solid formulations or pre-applied (dry film adhesive coating) for overhead applications. Recent developments are threadlockers that contain no declarable carcinogens, mutagens or reproductive toxins and thus carry no hazard symbols, risk or safety phrases.

Anaerobic threadlocker adhesieves are covered in detail in the book How to Increase Reliability and Prevent Threaded Assembly Failure (Henkel Corporation, 2020).

LOCTITE XPLORE

Get access to tips & tricks from experts in Threadlocking eLearning.

Log in and select the chapter Threadlocking and select Why Use LOCTITE Threadlockers to learn more.

Debunk some of the most common myths!

Log in and select the chapter Threadlocking and select Mythbusters to learn more.

Table of contents

Already have an account? Sign in

+33,000
professionals

have already
signed up

Award winning manual

Platinum Award for LOCTITE®X Digital Manual

The Digital Manual is for professionals by professionals

The manual is made entirely for you. However, if you’re still not convinced that free industry knowledge is for you, take a look at these user testimonials from the users of the manual.

"The topics are such that I can help take design related decisions very well at work. It's an interesting and knowledgeable read, I recommended my other colleagues to have a look at the manual as well."

Hanumant, Production Incharge

"The manual's chapters significantly enhanced my comprehension of various engineering topics. The manual adeptly presents explanations and examples of concepts, showcasing a high level of clarity and effectiveness in its content."

Tejas, Mechanical Engineer from a renowned Engineering College

"The release of this manual by a renowned brand such as Loctite has proven to be highly motivating for students. Its authentic content serves as a source of inspiration, encouraging students to engage actively in reading and learning."

Padmakar Deshmukh, Professor at an Engineering College