Despite their small and simple design, cable glands are an important component of electrical installations. They are used in nearly all areas of industry and trade.
They ensure safe cable entry, provide strain relief, and make sure that cables are introduced into junction boxes, distribution boards, control cabinets, and similar enclosures in a dust- and watertight manner. Cable glands protect electrical components from mechanical stress such as bending and kinking, as well as from environmental influences like dust and moisture, by securely and tightly connecting the cable to the enclosure wall.
In principle, a cable gland consists of three parts: cap nut, sealing insert for cable glands and socket. The cap nut can perform additional functions to protect the cable from mechanical influences. This can be a bend protection for polyamide cable glands or made from brass, or a particularly strong external strain relief from plastic or brass. Even stronger cable protection can be achieved by using plastic or metal cable protection hoses. These protect the cable against extreme conditions with integrated connections (plastic / metall).
Table of thread/clamping ranges for metric cable glands
The table below shows the different thread sizes and clamping ranges of metric cable glands. Metric cable glands ensure a secure and tight connection for cable installations. Thanks to their reliable sealing, they provide optimal protection against environmental influences.
Typical sizes range from smaller cable glands such as M12 and M16, to the widely used M20 and M25, up to large metric cable glands like M63 and M75. Unlike PG or NPT cable glands, versions with metric connection threads use an internationally standardized ISO thread.
| Thread | Major diameter | Tap drill diameter | Clamping range | Clamping range ESKV Plus |
| Cable gland M12 x 1.5 | 12.0 mm | 12.0 + 0.2 mm | 3 - 7 mm | - |
| Cable gland M16 x 1.5 | 16.0 mm | 16.0 + 0.2 mm | 4,5 - 10 mm | - |
| Cable gland M20 x 1.5 | 20.0 mm | 20.0 + 0.2 mm | 6 - 13 mm | - |
| Cable gland M25 x 1.5 | 25.0 mm | 25.0 + 0.2 mm | 9 - 17 mm | 13 - 17,5 mm |
| Cable gland M32 x 1.5 | 32.0 mm | 32.0 + 0.3 mm | 13 - 21 mm | 19 - 25 mm |
| Cable gland M40 x 1.5 | 40.0 mm | 40.0 + 0.3 mm | 16 - 28 mm | 26 -32 mm |
| Cable gland M50 x 1.5 | 50.0 mm | 50.0 + 0.3 mm | 21 - 35 mm | 32 - 39 mm |
| Cable gland M63 x 1.5 | 63.0 mm | 63.0 + 0.3 mm | 34 - 48 mm | - |
| Cable gland M75 x 1.5 | 75.0 mm | 75.0 + 0.4 mm | 48 -62 mm | - |
Cable gland cable diameter table
Table of thread/clamping ranges for cable glands with PG thread
PG cable glands are classic cable entry solutions primarily used in older machinery, control cabinets, and existing installations. Unlike metric cable glands standardized according to ISO or NPT cable glands with tapered threads for the US market, PG cable glands use the Panzergewinde (armored conduit thread) in accordance with DIN standards.
The table showing thread sizes and clamping ranges for cable glands with PG threads provides all relevant information for selecting the appropriate cable gland. For example, a PG11 cable gland can reliably secure cables with a diameter of 5 to 10 mm. Polyamide and brass PG cable glands therefore offer dependable protection against the ingress of dust and moisture.
| Thread | Pitch | Threads per inch | Major diameter | Tap drill diameter | Clamping range |
| Cable gland PG7 | 1.27 | 20 | 12.5 mm | 12.5 + 0.2 mm | 3 - 6 mm |
| Cable gland PG9 | 1.41 | 18 | 15.2 mm | 15.2 + 0.2 mm | 4 - 8 mm |
| Cable gland PG11 | 1.41 | 18 | 18.6 mm | 18.6 + 0.2 mm | 5 - 10 mm |
| Cable gland PG13,5 | 1.41 | 18 | 20.4 mm | 20.4 + 0.2 mm | 6 - 12 mm |
| Cable gland PG16 | 1.41 | 18 | 22.5 mm | 22.5 + 0.2 mm | 8 - 14 mm |
| Cable gland PG21 | 1.58 | 16 | 28.3 mm | 28.3 + 0.2 mm | 10 - 18 mm |
| Cable gland PG29 | 1.58 | 16 | 37.0 mm | 37.0 + 0.3 mm | 16 - 25 mm |
| Cable gland PG36 | 1.58 | 16 | 47.0 mm | 47.0 + 0.3 mm | 22 - 32 mm |
| Cable gland PG42 | 1.58 | 16 | 54.0 mm | 54.0 + 0.3 mm | 28 - 38 mm |
| Cable gland PG48 | 1.58 | 16 | 59.3 mm | 59.3 + 0.3 mm | 36 - 44 mm |
Table of thread/clamping ranges for cable glands with NPT thread
When selecting the right cable gland with an NPT thread, it is important to consult the cable gland size chart showing the thread sizes and clamping ranges. Unlike metric cable glands, NPT versions use tapered threads.
Each model is designed to meet specific technical requirements—whether temperature resistance, grounding, protection against dust and water ingress, or resistance to pressure. WISKA ensures a safe and reliable cable entry solution.
| Thread | Pitch | Major diameter | Tap drill diameter | Clamping range |
| Cable gland NPT 1/4" | 1.41 | 13.7 mm | 14.1 + 0.2 mm | 3 - 7 mm |
| Cable gland NPT 3/8" | 1.41 | 17.1 mm | 17.4 + 0.2 mm | 4,5 - 10 mm |
| Cable gland NPT 1/2" | 1.81 | 21.3 mm | 21.6 + 0.2 mm | 6 - 13 mm |
| Cable gland NPT 3/4" | 1.81 | 26.7 mm | 27.0 + 0.2 mm | 9 - 17 mm |
| Cable gland NPT 1" | 2.21 | 33.4 mm | 33.7 + 0.2 mm | 13 - 21 mm |
| Cable gland NPT 1 1/4" | 2.21 | 42.2 mm | 42.5 + 0.2 mm | 16 - 28 mm |
| Cable gland NPT 1 1/2" | 2.21 | 48.3 mm | 48.7 + 0.2 mm | 21 - 35 mm |
| Cable gland NPT 2" | 2.21 | 60.3 mm | 60.7 + 0.2 mm | 34 - 48 mm |
At first glance, they may seem inconspicuous—but WISKA cable glands are cutting-edge technology. Each cable gland embodies decades of development and innovative know-how. Worldwide, WISKA cable glands are used across a wide range of industries, contributing to the reliable operation of technical systems. Whether exposed to extreme temperatures, dirt, water, moisture, or mechanical stress, WISKA’s high-quality, waterproof cable glands withstand even the harshest conditions.
The right cable gland for every application
Since 1925, the founders of WISKA have developed the first plastic cable gland, laying the foundation for the company’s comprehensive cable gland portfolio today. WISKA’s product range includes metal cable glands (stainless steel and brass) as well as plastic cable glands in a wide variety of designs, from standardized to highly specialized. In addition, threadless cable entry systems and a full range of accessories and tools for cable glands are available. Anything not in the standard range can be custom-developed by WISKA to meet individual customer requirements.
The WISKA Product Finder online helps you select the right cable gland: Is the device exposed to high or very low temperatures? What IP rating (Ingress Protection) is required? Which thread type is needed? Is a specific color (e.g., a black cable gland) or material preferred? What is the cable diameter? WISKA identifies the suitable product and provides all the necessary help and details.
The SPRINT® cable gland system by WISKA has a modular design. Its components are completely compatible with one another and offer a solution for virtually any installation. SPRINT® cable glands are available in brass, stainless steel and plastic, and are suitable for use in a wide range of applications and branches. The comprehensive cable gland range offers metric, PG and NPT threads in various lengths, as well as cable glands that can be used in temperatures down to as low as -60 °C. Custom designs, such as different thread types and special seals, can be made upon request.
Quick and easy installation
SPRINT® cable glands are easy to combine and require only a single, size-dependent installation tool. A 4-in-1 principle means every cable gland has a simple and precise construction: four elements – the cap nut, sealing insert, an optional EMC insert and fittings – gives a SPRINT® cable gland. Whether they’re made of plastic, brass or stainless steel, all cable glands have identical clamping ranges. The comprehensive range of multiple sealing inserts, reduction sealing inserts and special sealing inserts is compatible with all types of material and a wide variety of cable entries. The SPRINT® cable gland system fulfils all requirements for the protection classes IP 68 and IP 69. Our latest SPRINT® development, the Push-In, no longer requires the installation of a locknut. This saves valuable installation time and still provides high strain relief in accordance with DIN EN 62444 and IP 68 protection.
SPRINT distinguishes itself in the efficient installation of the WISKA cable gland system. The components can be easily combined and require only a single, size-dependent installation tool
The SPRINT® cable gland range offers special solutions for unique demands such as cable glands with flex and bend protection. Spiral-shaped cable glands ensure maximum security and the protection of flexible cables, making them even safer to use.
WISKA also offers SPRINT® cable glands with integrated or additional external strain relief that prevents mechanical forces from interfering with the cable connections. The patented WISKA lamella system ensures optimal sealing and cord grip.
WISKA also offers SPRINT cable glands with integrated or external strain relief that prevents mechanical forces from interfering with the cable connections
WISKA offers two different EMC cable gland solutions for protection against electromagnetic interference. EMC cable glands are available with either an earthing cone or a contact spring insert. EMC cable glands by WISKA guarantee effective 360° shielding and long-lasting imperviousness with a protection class of IP 68/69K.
Get to know our specially developed MagikNUT® EMC plastic locknut with integrated stainless steel clip for EMC shield contacting. It can be combined with all plastic cable glands and thus offers the user significantly greater flexibility during installation.
Two EMC cable glands: earthing insert (above), contact spring insert (below) EMC cable glands by WISKA are available with either earthing cones (above) or a contact spring insert (below)
The ex-cable glands by WISKA are the perfect option for applications in hazardous areas. Explosion-proof cable glands are available with various types of ignition protection according to ATEX guidelines, IECEx standards, Inmetro requirements and EAC norms.
WISKA’s ex-portfolio encompasses everything from cable glands, screw plugs and extensions to adapters.
WISKA’s ex-portfolio encompasses everything from cable glands, screw plugs and extensions to adapters
Electrical installations that are subject to major temperature fluctuations and high moisture require a unique solution. WISKA’s innovative pressure equalisation cable gland VentGLAND® contains a semi-permeable ePTFE membrane, which ensures constant pressure equalisation between the inside and outside of the casing.
VentGLAND® allows the casing to breathe. In this way, pressure equalisation cable glands minimise the hazard of condensation formation.
The VentPLUG is used when a cable gland with an additional pressure equalization unit is required to vent the enclosure.
Pressure equalization units from WISKA are now also available in thread sizes M20 and M40, in addition to M12. Both feature a flat, space-saving design to enable flexible usage. Thanks to an improved membrane, the air flow rate of the new VentPLUG in the sizes M20 and M40 has more than doubled. The high air flow version even achieves a 2.5 times higher value.
You may also use our venting calculator to compute the optimal application of our pressure equalization products.
Pressure equalisation cable glands by WISKA reduce the hazard of condensation formation in the casings
Hygienic design cable glands by WISKA are easy to clean and are used wherever sanitary conditions are necessary
Multiple sealing inserts by WISKA securely fasten cables of various sizes to the cable gland
As an alternative to cable glands, WISKA has membrane cable entries in its product portfolio. CLIXX® enables simple cable entry thanks to a soft component with simultaneous strain relief. CLIXX® is fitted on one side without a locknut or tool: simply click, push the cable through and you're done. If several cables are to be inserted, MultiCLIXX® offers a space-saving solution for up to four cables.
The membrane range is complemented by QUIXX®, a 2-component cable entry system for threaded or plug-in installation. QUIXX® enables the insertion of special cables and replaces cable glands in standard installations.
The threadless CLIXX cable entries are considerably flatter than conventional threaded cable entries
The split cable gland CONMAXX® Gland from WISKA allows for the easy installation of pre-assembled cables (M20 to M63) and wiring—even during operation. Each piece ensures a secure, tight (IP66), and strain-relieved installation. In combination with split and multiple sealing inserts, the cable gland can be installed with exceptional flexibility and versatility.
CONMAXX® Gland split cable gland
Products and their materials that are used in the railroad sector must be tested in accordance with the fire protection standard DIN EN 45545. The entire Railway series has successfully undergone fire resistance testing in accordance with DIN EN 45545-3:2013-08. Furthermore, all RW components meet the highest Hazard Level 3 requirements that can be placed on materials used in the railroad sector. This makes WISKA one of the first European manufacturers to have successfully tested a complete range of fittings in plastic, brass and stainless steel in accordance with this standard and hazard level.
The WISKA Railway series - cable glands according to DIN 45545
