Cable connectors
What is a M25 cable gland?
M25 cable glands from manufacturers such as WISKA and Lapp feature a metric thread with a diameter of 25 mm. The structure of an M25 cable gland differs from manufacturer to manufacturer with regard to certain details but the handling is similar in many respects. This applies to both a SKINDICHT or SKINTOP cable gland from Lapp as well as the comparable WISKA cable glands.
Features of an M25 cable gland: A metric Lapp cable gland of size M25 has a minimum and maximum clamping range, a seal, a union nut and a locking nut
What materials are available for M25 cable glands and where are they used?
- M25 cable glands made of metal are suitable for areas with high temperatures and can withstand high mechanical loads.
- Stainless steel cable glands are used in the hygiene and food sectors as increased corrosion resistance is essential in this area.
- M25 cable glands made of plastic are cheaper than a metal gland and are often used in electrical wiring, e.g. in control cabinets or distribution cabinets.
- If the M25 cable gland has the abbreviation Ex, it is designed for use in potentially explosive areas and is then often made of brass.
| Type according to material | Application | Advantage/disadvantage |
| Plastic cable gland | Distribution boxes, control cabinets, photovoltaics | cheap and light / not electrically conductive |
| Stainless steel cable gland | Hygiene sector, shipbuilding, ATEX / Ex-EMD | corrosion-resistant / high weight, comparatively expensive |
| Metal cable gland | Plant, vehicle and mechanical engineering | robust, temperature-resistant / high weight |
| Brass cable gland | Shipbuilding, ATEX /Ex-EMD | temperature-resistant / high weight, comparatively expensive |
Properties and colours of M25 cable glands
Generally, an M25 cable gland is made of plastic and is halogen-free. Depending on the colour of the housing, connectors are available in black, white or grey.
Thanks to their properties, cable glands in size M25 can also be used outdoors. Among other things, it is certified according to IP protection class IP69 and IP68, or is UV-resistant, depending on the version. At the same time, the M25 cable gland provides tension relief for the cable being fed through.
What types of M25 cable glands are available?
The conventional PG cable gland (PG16) is gradually being replaced by M25 cable glands which feature a metric thread for regulatory reasons. Manufacturers such as WISKA also offer M25 cable glands for difficult installation projects. Among others, the following variants are available.
| Type | Description | Application |
| M25 elbow gland | Guides cables securely around tight angles without kinking | Control cabinets, machine housings |
| M25 cable gland with long thread | Cable gland with long, metric connection thread | For housings with thick walls |
| M25 ATEX / Ex gland | Counteracts sparking and arcing, withstands explosion pressure | Potentially explosive atmospheres |
| M25 EMC gland | Protection against electromagnetic radiation | Telecommunications, measurement and control technology |
What is the diameter of an M25 cable gland and which cables fit through it?
An M25 cable gland is defined by the inner diameter of 25 mm. This also determines the minimum/maximum clamping range which defines the possible cable diameter of a wire that fits into an M25 cable gland. The most important information at a glance:
- Thread diameter: 25 mm
- Bore diameter: 25.2 mm
- Thread pitch:: 1.5
- Lead-through hole: 25.5 mm
- M25 cable gland for 2 cables: 2 x 6 mm diameter (e.g. M25 multiple sealing insert from Lapp)
What is the clamping range of an M25 cable gland?
Maximum 9 mm, minimum 17 mm
Which PG gland corresponds to an M25 cable gland?
It is not possible to assign armoured conduit threads to threads with metric size exactly. After the changeover from PG to metric threads, a PG cable gland with size 16 was equated to a metric cable gland with the dimensions M25 x 1.5.
Overview of metric threads for cable glands
| Nominal size metric | Clamping range (approx. data) | Outer Ø of the thread 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 |
| 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 |
M thread according to EN 60423 or IEC 423 or BS 6053 ISO 68/DIN13