Double Seam Overlap Calculator

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Precision is essential when it comes to maintaining the integrity of a double seam. There are several crucial elements to calculate when seaming to ensure the seam is neither too tight nor too loose.  

When defects crop up, measurements are the best place to start. Our handy double seam overlap calculator was created to provide an estimated value of overlap, overlap % and BH butt when used with a mechanical micrometer gauge.  

Before you use the double seam calculator, let’s define the double seam inspection points it can help you measure. 

Double seam inspection points

• Overlap: the overlap is often referred to as the “secondary seal” in the double seam. It measures the outer side of the double seam, as it interlocks over the body wall. 

• Overlap %: simply a percentage of the overlap within the seam.  
• Body hook butting (BH butting): percentages showing how much the body hook is embedded into the seaming compound and how much space there is available for the body hook in the seam.  

Masters of metal packaging

Across the Industrial Physics portfolio, we make a wide range of double seam inspection tools and accessories. The options range from innovative handheld devices like the CMC-KUHNKE QbyV SEAMetal Portable through to fully automated measurement systems such as the CMC-KUHNKE AUTO-XTS. Please take some time to explore our whole catalog of double seam inspection options. 

In the knowledgebase section of our website we like to share our knowledge. Why not check out our glossary of double seam defects? Then you could read this blog on how to measure a double seam.  

If you’re still thirsty for double seam inspection advice, you’ll find a deeper exploration of can inspection problems and solutions in our double seam inspection guidebook, or just get in touch!    

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