What Is a Cable Gland and Why Size Matters

Cable glands are small but essential parts used in electrical installations. Their main job is to secure the cable entering a device, panel, or junction box. They also help keep water, dust, and other particles out of the enclosure, which is especially important in outdoor or industrial environments. Without the right gland, cables can become loose, damaged, or exposed to the elements, leading to potential hazards or equipment failure.

Getting the correct cable gland size is not just about a good fit—it’s about safety and performance. A poorly sized gland may not properly grip the cable, which can allow moisture in or cause strain on the wires. That’s why professionals use size charts to find the perfect match based on cable diameter and thread type. This small step helps ensure a reliable, sealed, and long-lasting connection in any setup.

Common Cable Gland Types and Standards

There are several types of cable glands, and they vary based on material, thread style, and region. The most common thread types include Metric, PG (Panzer-Gewinde), NPT (National Pipe Thread), and BSP (British Standard Pipe). Metric and PG types are more common in Europe, while NPT is widely used in North America. Each has its own sizing system, which can be confusing at first glance.

For example, a Metric M20 gland might fit a cable with a diameter range of 6 to 12 mm. But a PG11 gland, which is roughly similar in size, uses different measurements. That’s why size charts are important—they help translate between standards and ensure the right gland is used. When selecting a gland, consider the cable’s outer diameter, the thread type required for your enclosure, and the environmental conditions.

Understanding the Cable Gland Size Chart

A cable gland size chart is a handy reference that helps electricians, installers, and engineers choose the right gland based on the cable’s outer diameter. These charts typically list thread types and sizes in one column, and the corresponding cable diameter ranges in another. You’ll often find other details, too—like dimensions, wrench sizes (A/F), and IP ratings.

Using a chart helps avoid guesswork and mistakes. For instance, if you have a cable with an outer diameter of 10 mm, the chart will show which gland sizes from each thread standard will work. This is especially helpful when working with multiple cable sizes or international products. Many manufacturers follow similar ranges, but always check the specific chart for the brand or type you’re using. A downloadable PDF makes it even easier to keep a copy on hand or print it out for job sites.

Key Information in the Size Chart

When you look at a typical cable gland size chart, you’ll see several important columns. First is the thread type and size, such as M16, PG9, or 1/2” NPT. Next is the cable diameter range, showing the minimum and maximum cable sizes the gland can grip. This is often given in millimeters. Then you’ll usually see measurements like the gland’s body length, thread length, and A/F (across flats) size, which helps you know what tools you’ll need.

Some charts also include the IP rating, which tells you how well the gland seals out dust and water. IP68, for example, means it’s fully dustproof and can handle long-term immersion in water. A good chart gives all the details in one place so you can quickly pick the right gland without trial and error. That’s why having a reliable, easy-to-read PDF chart can save time and effort.

Download the Cable Gland Size Chart PDF

Whether you’re working in a busy workshop, wiring a control panel, or installing outdoor lighting, having quick access to a cable gland size chart can make the job smoother. A PDF version of the chart is especially useful because it can be downloaded, shared, or printed for use on-site. Instead of flipping through catalogs or searching online every time, you’ll have the right sizes at your fingertips.

This chart is organized by thread types and includes a wide range of sizes and specifications. It’s ideal for electricians, technicians, and engineers who need reliable sizing info. It’s also a great resource for learners or those new to electrical installations. The downloadable version is clean, simple, and designed to be user-friendly—no technical jargon, just practical data. Keeping a copy of this chart nearby helps you make faster, safer choices when selecting cable glands for any project.

Why Keep a PDF Version Handy

Even in today’s digital world, sometimes it’s easier to work with a printed guide. A PDF chart can be stored on your phone, computer, or even in your toolbox. It’s searchable, printable, and doesn’t require an internet connection, which is a plus when working in remote areas. Having one reference sheet that covers all major thread types and cable sizes also cuts down on confusion.

You can also share it easily with coworkers or trainees, ensuring everyone’s using the same information. And since cable gland sizes don’t change often, one good chart can serve you for years. Whether you’re double-checking before a purchase or confirming the fit on-site, the PDF is a reliable tool. It’s just one small file—but it can make a big difference in how smoothly your projects run.