Understanding AN fitting sizes is crucial for anyone working with high-performance fluid systems. This comprehensive guide provides everything you need to know about AN fitting sizes, from decoding the dash numbers to selecting the right fit for your application. We’ll cover the sizing system, common sizes, and provide a helpful chart to simplify the selection process.
Choosing the correct AN fitting size is essential for ensuring a secure, leak-free connection and optimal system performance. This guide will empower you with the knowledge to navigate the AN sizing system with confidence, avoiding costly mistakes and ensuring your fluid system operates flawlessly.
What Is An Fitting?
AN (Army-Navy) fittings are a type of flare fitting widely used in high-performance fluid systems, particularly in aerospace, motorsports, and other demanding applications.
Originally designed for military use, they adhere to strict standards and specifications, ensuring reliability and performance under extreme conditions. AN fittings utilize a 37-degree flare angle and are known for their robust construction, precise threading, and ability to withstand high pressures, temperatures, and vibrations. This makes them a preferred choice for critical applications where leaks or failures are unacceptable.
AN Fitting Size Chart
AN (Army-Navy) fittings are a staple in high-performance fluid systems, prized for their reliability and leak-free connections. Understanding AN fitting sizes is absolutely crucial for selecting the right components for your application. The AN sizing system, while seemingly simple, can be a source of confusion if not properly understood.
This comprehensive guide will delve deep into AN fitting sizes, providing you with the knowledge to navigate this system with confidence.
AN Sizing System
AN fitting sizes are designated by a dash number (e.g., -4, -6, -8, -10), which represents the nominal size of the fitting in 1/16th of an inch. So, an AN-6 fitting is nominally 6/16″ (or 3/8″), an AN-8 is 8/16″ (or 1/2″), and so on. It’s important to note that this is a nominal size, and the actual dimensions of the fitting, especially the threads, can vary. The dash number often, but not always, corresponds to the inner diameter of the hose the fitting is designed to accommodate.
Key Measurements and Their Significance
When working with AN fittings, several key measurements are important:
- Flare Diameter: This is the outside diameter of the flared portion of the fitting that creates the seal. It’s crucial for matching the fitting to the correct mating component.
- Thread Size: AN fittings use specific thread sizes that are unique to each dash size. This ensures proper engagement and prevents cross-threading.
- Hose Size: If you’re connecting a hose to an AN fitting, you need to know the hose’s inner diameter. This should generally correspond to the AN dash size of the fitting.
- Overall Length: While not directly related to the AN size designation, the overall length of the fitting can be important for space constraints and system layout.
How to Use an AN Fitting Size Chart
An AN fitting size chart is an invaluable tool for identifying and selecting the correct fittings. These charts typically list the following information for each AN size:
- Dash Size: The nominal size designation (e.g., -4, -6, -8).
- Flare Diameter: The actual outside diameter of the flare.
- Thread Size: The thread specification for the fitting.
- Hose Size (Recommended): The recommended hose inner diameter for the fitting.
When using a chart, start with the hose size (if applicable) or the desired flow rate. Then, find the corresponding AN dash size and note the flare diameter and thread size to ensure compatibility with your other components.
Common AN Fitting Sizes and Applications
While AN fittings are available in a wide range of sizes, some are more common than others. Here’s a table summarizing common AN sizes and their typical applications:
| AN Size | Nominal Size (inches) | Flare Diameter (inches) | Thread Size (inches) | Common Applications |
|---|---|---|---|---|
| AN-4 | 4/16 (1/4) | ~0.438 | 1/4″-28 UNF | Small fuel lines, instrumentation, brake lines |
| AN-6 | 6/16 (3/8) | ~0.562 | 3/8″-24 UNF | Fuel lines, oil lines, coolant lines, brake lines |
| AN-8 | 8/16 (1/2) | ~0.750 | 7/16″-20 UNF | Fuel lines, oil lines, hydraulic lines |
| AN-10 | 10/16 (5/8) | ~0.875 | 9/16″-18 UNF | High-flow fuel lines, hydraulic lines |
| AN-12 | 12/16 (3/4) | ~1.062 | 3/4″-16 UNF | Large fuel lines, high-flow hydraulic lines |
| AN-16 | 16/16 (1) | ~1.312 | 1″-12 UN | Large hydraulic lines, specialized high-flow applications |
| AN-20 | 20/16 (1 1/4) | ~1.688 | 1 5/16″-12 UN | Very large hydraulic lines, specialized applications |
Note: The flare diameters and thread sizes in this table are approximate. Always consult a reputable AN fitting size chart for precise measurements. UNF denotes Unified National Fine thread, and UN denotes Unified National thread.
Understanding AN fitting sizes is essential for anyone working with high-performance fluid systems. By familiarizing yourself with the AN sizing system, key measurements, and size charts, you can confidently select the right fittings for your application, ensuring reliable and leak-free connections. Remember to always double-check measurements and consult manufacturer specifications for the most accurate information.
AN Fitting Dimensions
Understanding AN fitting dimensions can be a bit complex, as they don’t directly translate to simple measurements.
AN Size Designation:
- AN sizes are indicated by a number (e.g., -4AN, -6AN, -8AN).
- Historically, this number relates to the outside diameter (OD) of the tubing the fitting was designed for, in 1/16-inch increments. So, a -8AN fitting roughly corresponds to 8/16 inch, or 1/2 inch.
Thread Sizes:
- Each AN size has a corresponding standardized thread size. This is crucial for proper fitting and sealing.
- You’ll find variations between male and female thread dimensions.
Hose and Tube Dimensions:
- AN hose sizes are based on the inner diameter (ID) of the hose.
- AN tube sizes are based on the outer diameter (OD) of the tube.
Variations and Considerations:
- Dimensions can vary slightly between manufacturers and depending on the type of hose or fitting.
- It’s essential to use compatible components within an AN system to ensure proper sealing and prevent leaks.
- It is very important to remember that AN fittings utilize a 37 degree flare.
To get precise measurements, it’s best to consult detailed AN fitting dimension charts, and please find us online to get a clue about the an fitting dimensions chart.
How to Measure AN Fitting Size
Measuring AN fitting size correctly is crucial for ensuring proper fit and function in your fluid system. The AN sizing system, based on 1/16th inch increments, can be a bit confusing at first, but with a few simple steps, you can accurately determine the size you need. Remember, the dash number (e.g., -6, -8, -10) refers to the nominal size, which often, but not always, corresponds to the inner diameter of the hose it’s designed for. Accurate measurement is key to avoiding leaks and ensuring a secure connection.
This guide will walk you through the process of measuring AN fittings, ensuring you get the right fit every time. We’ll cover measuring both the fitting itself and the hose it’s intended to connect to, as both are important factors in selecting the correct AN size. Understanding these measurements will save you time, frustration, and potential system failures.
Step 1: Identify the Fitting Type
Before measuring, determine the type of AN fitting you’re working with (e.g., straight, elbow, tee). This will help you identify the correct points to measure. Different fitting types have different geometries, so knowing what you’re working with is the first step. This is especially important when dealing with complex fittings like tees or elbows, where multiple measurements might be necessary.
Knowing the fitting type also helps you understand its intended function within the system. For example, a bulkhead fitting will require a measurement of the panel thickness it’s designed to pass through, while an adapter fitting might require you to identify the type of connection it’s adapting to. This contextual information is crucial for accurate measurement and selection.
Step 2: Measure the Fitting’s Flare
For most AN fittings, the key measurement is the flare size. This refers to the diameter of the flared portion of the fitting that seals against the mating component. Use a caliper or ruler to measure the outside diameter of the flare at its widest point. This measurement, when converted to 16ths of an inch, will correspond to the AN dash size.
It’s important to measure the flare accurately, as even small discrepancies can lead to leaks or improper sealing. Ensure your measuring tool is calibrated and that you’re taking the measurement at the widest point of the flare. If you’re unsure, it’s always best to err on the side of caution and double-check your measurements.
Step 3: Determine the Hose Size (if applicable)
If you’re matching a fitting to a hose, you’ll also need to determine the hose size. For braided hoses, measure the inner diameter of the hose. Again, use a caliper or ruler for accuracy. This inner diameter should roughly correspond to the AN dash size of the fitting you need.
Keep in mind that hose sizes are also typically given in 1/16th inch increments. Matching the hose inner diameter to the AN fitting size is crucial for ensuring proper flow and a secure connection. If the hose size doesn’t perfectly match a standard AN size, you might need to use an adapter or consult with a hydraulics specialist to find the appropriate solution.
Step 4: Convert to AN Size
Once you have the measurements, convert them to 16ths of an inch. The resulting number will correspond to the AN dash size. For example, if the flare measures 6/16th of an inch, it’s an AN-6 fitting.
Remember that the AN dash size is a nominal size, and the actual dimensions of the fitting and its threads may vary slightly. Always consult the manufacturer‘s specifications for precise measurements and tolerances. This is especially important when working with critical applications where even small variations can impact performance.
How to Identify AN Fitting Size
Identifying AN fitting sizes correctly is crucial for ensuring proper fit and function in your fluid system. The AN sizing system, based on 1/16th inch increments, can be a bit confusing at first, but with a few simple steps, you can accurately determine the size you need. Remember, the dash number (e.g., -6, -8, -10) refers to the nominal size, which often, but not always, corresponds to the inner diameter of the hose it’s designed for. Accurate identification is key to avoiding leaks and ensuring a secure connection.
Step 1: Look for the Size Designation
Most AN fittings will have the size designation stamped or engraved directly on the fitting body. This is usually in the form of a dash number (e.g., -6, -8, -10). This is the easiest way to identify the size, so always check the fitting itself first.
Step 2: Measure the Flare Diameter
If the size designation isn’t readily visible, you can measure the outside diameter of the flare at its widest point using a caliper or ruler. This measurement, when converted to 16ths of an inch, will correspond to the AN dash size. Accurate measurement is crucial here.
Step 3: Check the Thread Size
While the flare diameter is the primary indicator of AN size, the thread size is also important for compatibility. You can use a thread gauge or pitch gauge to determine the thread size. This information can be cross-referenced with AN size charts to confirm the fitting size.
Step 4: Consult an AN Size Chart
If you’re still unsure, consult a reputable AN size chart. These charts list the nominal size, flare diameter, and thread size for each AN fitting size. This is a valuable resource for double-checking your measurements and ensuring you’ve correctly identified the fitting.
Conclusion
Understanding AN fitting sizes is crucial for anyone working with high-performance fluid systems. This guide has provided a comprehensive overview, from the numbering system to practical applications, empowering you to confidently select the correct components for optimal performance and reliability.
Mastering AN fitting sizes minimizes the risk of leaks, maximizes flow efficiency, and ensures system longevity. Whether you’re a professional mechanic or a DIY enthusiast, choosing the appropriate fittings is essential for success in any high-performance fluid application.
For high-quality AN fittings at competitive wholesale prices, contact DF Hydraulics today. Our extensive inventory and expert team are ready to assist you. Get in touch now to discuss your needs and experience the DF Hydraulics difference.
