Some of our resin pipe clamps are sold as sets that combine multiple parts, such as mounts and brackets, so even a slight size difference can greatly affect how securely they fasten. On this page, we explain how to choose the right size based on the structural features of resin pipe clamps.
What you'll learn in this article
- Our product size notation: what does compatible diameter Ø mean?
- What the markings on the body indicate
- Why the marking and compatible diameter do not always match
- Common mistakes when the wrong size is selected
- How to choose a resin pipe clamp correctly
What is compatible diameter?
Compatible diameter Ø (mm) indicates the outer diameter (mm) of the object that can actually be mounted. So when choosing a product, the key is not the nominal pipe size (A) used in piping standards or manufacturer naming, but the actual measured outer diameter (mm).
Basic selection steps
- Measure the outer diameter of the object to be mounted
- Choose a product with a compatible diameter that matches the measured value
For details, please seeHow to measure pipe outer diameter | Explaining size-check methods using calipers and a tape measurePlease check .
Why choose by compatible diameter instead of nominal size?
Nominal sizes used for piping, such as 15A and 20A, have different actual outer diameters depending on the type of pipe. For this reason, you cannot choose the right size based on nominal size (A) alone, so be sure to select based on the actual measured outer diameter (mm).
How to read the size marking on the body
The product body may have a marking indicating the nominal size or a similar size, but this is only supplementary information. It may not match the actual compatible diameter, so be sure to check the compatible diameter Ø (mm) on the product page.
Below, we explain why the marking may not match the compatible diameter.
Because they are manufactured using a common mold
To maintain quality and stable supply, some products use a common mold. Also, because pipes such as PVC pipe (VP) and gas pipe (GP) can have different outer diameters even with the same nominal size, there may be discrepancies between the marking and the compatible diameter. This is due to product specifications.
For anti-vibration types, a discrepancy occurs due to the structure
For anti-vibration types, vibration-damping rubber is bonded to the inside of the standard resin pipe clamp, which is based on piping standards. As a result, the body marking and the compatible diameter do not match for all products. This is a specification intended to ensure vibration-damping performance, so be sure to choose based on the outer diameter (mm) of the object.
How to choose a resin pipe clamp correctly (summary)
- Do not choose by nominal size (A)
- Measure the outer diameter (mm) of the object
- Choose a product with a compatible diameter Ø (mm) that matches the measured value
- Use the body marking as a reference only
When the product's compatible diameter is smaller than the outer diameter
- The clamp does not close enough, and the bolt is too short
- It cannot be combined with other parts such as mounts and brackets
- Excessive tightening increases the risk of damage to the clamp body
When the product's compatible diameter is larger than the outer diameter
- The clamp closes too much, and the end of the bolt protrudes
- The flat washer sits at an angle, making the body more likely to deform and causing loosening
- It becomes loose when combined with other parts such as mounts and brackets
When the outer diameter and the product's compatible diameter are the same
- A gap of about 10mm is secured in parallel (common to all sizes)
- The bolt tip protrudes appropriately and safely
- The flat washer makes contact evenly, reducing body deformation and making loosening less likely
- It fits securely with other parts such as mounts and brackets
Summary
The most important point when selecting a resin pipe clamp is to choose a product with a compatible diameter Ø (mm) that matches the measured outer diameter (mm), not the nominal size. Because these products are used by combining parts, selecting the exact size is what leads to safe use.
Related articles
- How to measure pipe outer diameter | Explaining size-check methods using calipers and a tape measure
- What is pipe nominal size? Explaining the differences from outer diameter, which is easy to confuse, by size
- Benefits of resin pipe holders | Differences from metal and why they maintain their appearance for a long time
- How to use resin pipe clamps