Cable connectors
Metric cable glands
Metric cable glands - designs and sizes
Metric ISO threads are standardised globally and replace the old PG threads. All metric cable glands are available in plastic, metal, brass or stainless steel. The focus of the metric thread sizes made today is between M12 and M63 and has a thread pitch of 1.5mm.
Special sizes such as cable glands M75, M85, M90, M100 and cable glands M110 are now only available in brass and stainless steel. Because a thread of a plastic cable gland is not stable enough.
You will find the most common metric cable glands in the table below.
Overview of the metric threads in cable glands:
| Nominal size, metric | Clamping range | Outer diameter in mm | Pitch |
| M12 cable gland | 3 - 7 mm | 12.0 | 1.5 |
| M16 cable gland | 4.5 - 10 mm | 16.0 | 1.5 |
| M20 cable gland | 7 - 13 mm | 20.0 | 1.5 |
| M25 cable gland | 9 - 17 mm | 25.0 | 1.5 |
| M32 cable gland | 11 - 21 mm | 32.0 | 1.5 |
| M40 cable gland | 19 - 28 mm | 40.0 | 1.5 |
| M50 cable gland | 27 - 35 mm | 50.0 | 1.5 |
| M63 cable gland | 34 - 45 mm | 63.0 | 1.5 |
Locking nuts for metric cable glands
Locking nuts made of plastic are glass fibre reinforced in order to guarantee mechanical stability. They are available in the well-known RAL colours: RAL 7001 silver grey, RAL 7035 light grey and RAL 9005 black. The version in black is UV-resistant. As a metal standard, the locking nuts are offered in nickel-plated brass. The stainless steel locking nuts are made of the alloy 1.4305 (V2A). The EMC locking nut is an anomaly: It is made of brass and is nickel-plated, but has claws for reaming insulated surfaces. It can be used to achieve contact between the control cabinet and the EMC connector, for example.
Determination of the nominal size:
the connector that you need on the spot can be determined on the basis of the outer diameter. However, this can vary slightly for production reasons.
Appropriate accessories for metric cable glands "
There is a wide range of accessories to go with the metric cable glands:
- Multiple seals with 2 to 16 holes, with different diameters
- Sealing plugs
- Cuttable rubber sealing rings for a flexible adjustment of the size
- O rings
- Compression screws
- Thrust washers
- Twist nipples
- Locking nuts
Application and properties
In the case of complex connections in control cabinets, housings and many other areas of application, the metric cable gland allows the cables to be fixed, sealed and inserted reliably. The popular SKINTOP cable gland from the portfolio of Lapp cable glands is just one example of the various possible applications of a metric cable gland.
Metric cable glands can be used in many different industries. For example, they are installed on electrotechnical equipment and machines, in the robotics industry, on moving machine parts or on lighting and sound applications.
Metric cable glands made of stainless steel or brass
A metric cable gland made of stainless steel or brass provides reliable bend and kink protection during installation and serves to secure flexible cables. It prevents the cables from coming loose or being pulled out of their anchorage. It protects the cables without impairing the functional safeguarding.
A cuttable rubber sealing ring enables it to be adjusted to different thicknesses of cable. In all thread sizes, e.g. M25 or M40, the metric stainless steel cable gland also guarantees optimal sealing right on the housing as well as strain relief thanks to a patented lamellar system.
In addition, special sizes and accessories are available specifically for sensors in sizes M5, M8, M12. The metric Lapp cable glands, just like the old PG threads, correspond to the protection class IP68 and are UV-resistant. The information about the thread length, the dimensions, the width across flats and the clamping range makes it possible to choose precisely the right metric cable gland.