In order to ensure quality, only grease fittings that have been certified to AS standards can be used when AS standards are specified. Vendors must provide proof of AS9100D certification and are often required to provide several documents including:
- Certificate of Conformance
- Chemical / Physical Analysis
- Heat Treating
- Dimensional Data
- Test Data
There is no difference between a “Grease Fitting” and a “Zerk” or “Zerk Fitting”, they are commonly used in place of one another. Additionally, the words “Grease Nipple”, “Grease Zerk”, and “Alemite Fitting” are also commonly used in place of the most universally accepted term of Grease Fitting.
In our last blog post we boiled grease fitting sizes down to three critical dimensions (Thread Size, Overall Height, and Hex) for the purpose of gaining a fundamental understanding of grease fitting sizes and how to determine the right size grease fitting for your application. In this post we will expand on those fundamentals and dive a little deeper into the anatomy of a grease fitting because Murphy’s law inevitably comes into place when one finds themselves working in crammed spaces and it never hurts to be prepared!
NOTE: We will once again reference the ¼”-28 Taper Thread Grease Fittings as our example because these are the most commonly used grease fittings.
A figure similar to the one below was used in our last post to help demonstrate the 3 fundamental/primary dimensions used when determining the size of grease fitting you need for your application.
There are a wide variety of grease fitting sizes and styles available to choose from, but determining the correct size for your needs can be boiled down to just critical 3 dimensions. A basic understanding of the ‘anatomy’ of a grease fitting will turn a grease fitting novice into an expert in no time.
NOTE: The figure below is used for reference and show ¼”-28 Taper Thread Grease Fittings in straight, 45°, and 90° orientation, which represents the most common type, and for all intents and purposes, the foundation of all other grease fitting styles.