To measure Inserts, Plastic Caps and Ferrules, follow these key steps:
1. Measure the External Tube Diamater
The external tube diameter is the measurement from one outside edge of the tube to the opposite outside edge, passing through the center. This dimension is crucial for determining the correct size of inserts, caps, or ferrules. To measure accurately, use a caliper or ruler, ensuring it’s aligned with the tube's center. For best results, take multiple measurements around the tube’s circumference to account for any slight variations in shape, and average these readings for accuracy.
Additionally, consider the tube material, as some may slightly expand or contract due to environmental conditions. Minor variations in diameter can affect the fit, so it’s advisable to measure in the same environment where the assembly will be used. With the correct external diameter measurement, you can confidently select the appropriate insert, cap, or ferrule, ensuring a secure and professional fit.
2. Measure the Tube Wall Thickness
Next, measure the tube wall thickness. This can be calculated by subtracting the internal diameter from the external diameter of the tube (Tube wall thickness = External Diameter – Internal Diameter). Understanding this measurement is important for selecting the right insert or cap, especially when dealing with varying wall thicknesses.
Our comprehensive range of round, square, and rectangular inserts is specifically designed to fit flush with your hollow tubes. Each insert features side fins that retract upon insertion, ensuring a snug and secure fit. For commonly used sizes, we offer plastic inserts that accommodate different tube wall thicknesses, providing versatility for various applications.
Tube wall thickness is often referred to as a "gauge." Below is a table that correlates tube wall thickness with the corresponding gauge number:
| Tube Wall Thickness (mm) | Gauge |
|---|---|
| 0.91 | 20 |
| 1.01 | 19 |
| 1.21 | 18 |
| 1.42 | 17 |
| 1.62 | 16 |
| 1.82 | 15 |
| 2.03 | 14 |
| 2.33 | 13 |
| 2.64 | 12 |
| 2.94 | 11 |
| 3.25 | 10 |
| 3.65 | 9 |
| 4.06 | 8 |
| 4.47 | 7 |
| 4.87 | 6 |
| 5.38 | 5 |
| 5.89 | 4 |
Conclusion
With accurate measurements of your external tube diameter and wall thickness, we can provide you with the appropriate plastic inserts and caps to meet your needs.
The same measurement principles apply to our rod and wire end tips, plastic ferrules, rubber ferrules, and rubber bungs. For bolt and nut caps, measurements are based on the thread diameter, which corresponds to a standard hexagonal head size. Threaded tube inserts should be measured in the same manner as blanking plugs, focusing on external tube diameter and tube wall thickness.
We offer a wide range of imperial and metric sizes for tube fittings. If you're unsure of your measurements, simply provide the closest dimensions you can, and we'll recommend the best available options.
If you'd like to test our products, please feel free to contact us for a free sample of our tube fittings. We're happy to assist you in finding the perfect fit for your application.
