Introduction
“Are cable glands universal?” is a common question. The short answer: No — cable glands are not universal. They come in different thread types, sizes, and materials. This guide explains what “universal” means and how to choose the right gland.
Why Aren’t Cable Glands Universal?
Cable glands have three variables that must match:
- Thread type — M (metric), PG, NPT, or G (BSPP)
- Size — M12, M16, M20, M25, etc.
- Cable range — The range of cable diameters the gland seals
If any of these don’t match, the gland won’t fit or won’t seal properly.
Thread Types Are Not Interchangeable
| Thread Type | Region | Interchangeable? |
|---|---|---|
| M (Metric) | Global / Europe / Asia | Standard, most common |
| PG | Europe / older equipment | Close to M but not interchangeable |
| NPT | North America | Tapered, not interchangeable |
| G (BSPP) | UK / Commonwealth | Parallel, not interchangeable with NPT |
What Is “Universal” in Cable Glands?
Some manufacturers market “universal” or “multi-size” glands. These typically mean:
- Multi-diameter seals — One gland seals a range of cable sizes (e.g., 6–12mm)
- Universal thread adapters — Includes adapters to fit different thread types
- Combination glands — Can be used with multiple cable sizes
But even “universal” glands have limits — they won’t fit every enclosure or every cable.
How to Choose the Right Gland
- Identify your enclosure thread — Measure the drill hole or check the equipment manual
- Measure your cable — Outer diameter, not individual wires
- Match the thread type — M, PG, NPT, or G
- Match the cable range — Cable must fall within the gland’s range
- Choose the right material — Nylon, brass, or stainless steel for your environment
FAQ
Can I use an M gland in a PG hole?
If the sizes are close (e.g., M20 in a PG13.5 hole), it might fit loosely but won’t seal properly. Always match the thread type.
What’s the most common thread type?
Metric (M) is the most common globally. PG is still widespread in European and Asian industrial equipment.
Are there “universal” glands that fit everything?
No — but some glands include adapters to fit multiple thread types. Check the product specifications.
Conclusion
Cable glands are not universal — they must match the enclosure thread, size, and cable range. When in doubt, measure the enclosure hole and the cable outer diameter, and order accordingly. Contact us for help choosing the right gland.
