A cable gland lets a lead into a sealed box without letting water and dust in with it. The gland screws through a hole in the enclosure wall and a lock nut holds it from the inside. When you do the dome nut up, a rubber insert closes down onto the cable, so it seals and clamps the cable in one go. A tug on the lead then pulls on the gland, not on the terminals inside.
These are black nylon IP68 glands in eight metric sizes, M8 to M25, covering round cable from 2.5mm up to 18mm across. Pick the size by the cable's outside diameter first, then drill the hole to suit that thread. Each one comes assembled with its lock nut and panel gasket, and they are sold singly, so you can mix sizes for one box.
Pick your size
| Size | Thread | Panel hole | Cable outside diameter |
|---|---|---|---|
| M8 | M8 x 1.25 | 8mm | 2.5-4.5mm |
| M10 | M10 x 1.5 | 10mm | 2.5-5mm |
| M12 | M12 x 1.5 | 12mm | 3-6.5mm |
| M16 | M16 x 1.5 | 16mm | 4-8mm |
| M18 | M18 x 1.5 | 18mm | 5-10mm |
| M20 | M20 x 1.5 | 20mm | 6-12mm |
| M22 | M22 x 1.5 | 22mm | 10-14mm |
| M25 | M25 x 1.5 | 25mm | 13-18mm |
Specifications
Great for
Fitting a cable gland
- Measure the cable
Measure across the outer sheath and pick the size whose range it sits in, ideally near the middle.
- Drill the hole
Drill to the thread size (20mm for M20) with a step drill or hole saw, and deburr it so the gasket sits flat.
- Mount the gland
Gasket on the thread, push it through from outside, then do the lock nut up from inside.
- Run and seal the cable
Back the dome nut off, feed the cable through, then tighten until the insert grips. Give the cable a tug to check it holds.
Note: a gland is a mechanical cable entry with no voltage or current rating of its own. Mains wiring still has to meet NZ wiring rules and be done or checked by a licensed electrician.