- 2 Min Read
- By: Andrew Peng
6 Tips for Effective Use of Anti Seize
Anti-seize compound is commonly applied to fasteners to prevent the threads from becoming galled or damaged - especially when dissimilar metals are involved. For people that live in locations where corrosion is a persistent issue, anti-seize is an invaluable tool to have, helping to prevent thread damage and contamination from corrosion. Keep these tips in mind when reaching for the tube of anti-seize next time you're working on a car.
- Use Anti-Seize Sparingly
The goal of using anti-seize is to coat the threads with the compound - this prevents corrosion and adhesion between the thread and the fastener. Too much anti-seize applied to the thread can attract debris that may contribute to contamination the thread and preventing the fastener from being removed cleanly.
- Reduce Torque Values by 25% - 30%
Commonly forgotten - torque ratings on fasteners are based on their target clamping force. Anti-seize will act as a lubricant - the lubricating properties will significantly decrease the required torque to achieve the desired clamping force. In extreme situations, using anti-seize without reducing the required torque value can strip the threads or stretch the bolt. The exact value of torque reduction varies with material.
- Use the Right Type of Anti-Seize For the Application
Most people are familiar with the ubiquitous silver tube of anti-seize made by Permatex, which is stable up to 1600F. Permatex also makes a copper compound anti-seize which is stable to 1800F, and a nickel compound anti-seize that is stable to 2400F. The copper compound also conducts electricity, and the nickel compound is designed to be used when fasteners must be kept free of copper contamination since the plain anti-seize and the copper anti-seize contain copper.
- Know When Not to Use Anti-Seize
While anti-seize can seem like an excellent idea on some stubborn fasteners or as a shortcut to a proper repair of damaged fasteners, some applications should not use anti-seize. If the thread is already damaged or cross-threaded, do not use anti-seize to help install the fastener. The threads need to be chased, re-tapped, or repaired. Do not use anti-seize as a lubricant such as on caliper slide pins or on threads for a bushing press or any mechanical assembly that requires a lubricant. Don't use anti-seize on exposed threads because the compound can attract contaminates that may contribute to thread damage when the fastener is removed.
- Know When to Use Anti-Seize
Anti-seize should be used when dissimilar metals are involved (steel bolt into an aluminum brake caliper), when threads may be exposed to corrosive effects (suspension fasteners), where high-heat may accelerate corrosion (manifold, turbo, and exhaust fasteners), and on fasteners that frequently get removed (underbody trays covering the oil pan).
- Clean Excessive Anti-Seize After Assembly
When putting your component back together and installing the fasteners, wipe off excessive anti-seize that is exposed. As mentioned above, extra anti-seize will attract contaminants that may damage threads. The only part of the fastener that needs anti-seize is where the two materials meet, under the head of the fastener and in the threads. For through-hole applications, clean the exposed thread as well.
About the Author: Andrew Peng
Andrew is an aerospace engineer and car fanatic that enjoys working on his garage of Volvos and Subarus. When he's not busy attending car meets and shows or taking things apart, he enjoys driving his cars and finding interesting new ways to break them. He can be reached via his personal website at http://andrewpeng.net, Facebook, Google+, Instagram, or Twitter.
Andrew is an aerospace engineer and car fanatic that enjoys working on his garage of Volvos and Subarus. When he’s not busy attending car meets and shows or taking things apart, he enjoys driving his cars and finding interesting new ways to break them. He can be reached via his personal website at http://andrewpeng.net, Facebook, Google+, Instagram, or Twitter.