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Cable gland nuts

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Nuts for cable glands

Nuts for cable glands are an integral part of threaded grommets used for sealing connections of wires, cables and electrical installation pipes. Threaded cable glands are made of plastic and metals (stainless steel or brass), so the nut should be matched to the cable gland not only in terms of cross-section, but also material.

Nuts for cable glands - types and applications

On the market of electrical equipment and apparatus, cable glands, also called interchangeably glands or glands, are an important place among those that guarantee a tight connection of cable penetration between the interior of the housing and its external part.

In addition to ensuring tightness, the role of cable glands is also to protect the cable or wire against damage (e.g. breakage of the insulation continuity by a sharp edge of the opening in the housing). Among the cable glands we distinguish:

  • threaded, i.e. screwed, intended for wires and cables and installation tubes,

  • membrane, used for wires and cables,

  • pivot, used for sealing cable ducts.

An integral part of each threaded gland is the upper nut, pressing the cable in the gland and the lower nut, which holds the gland after sliding it into the hole in the device enclosure or electrical cabinet.

Key parameters of cable glands and nuts

As the nuts are an integral part of the threaded cable gland, they must have the same parameters as the cable gland. As an assembly, they ensure a certain degree of tightness, which in turn is reflected in the IP degree of protection. Most often, the glands provide a high degree of protection due to the fact that they are usually used in difficult conditions, exposed to dust, moisture and even water. Glands with IP 68, and such on the market by far the most, are completely dustproof, and also protect against the ingress of water into the connection.

Of great importance for ensuring the tightness of the gland are the nuts in its upper part, but also the nuts in the lower part must be perfectly matched with the threads, so as not to reduce the tightness of the connection of the gland with the casing.

The glands, and therefore the nuts, are usually adapted to operate not only in the presence of water and dust, but also in environments with low or high temperatures. Most often they can withstand without changing their parameters temperatures from -40 to +100 degrees Celsius, as well as large fluctuations thereof.

The most common gland nuts on the market

Both cable glands and compatible nuts are made of materials that provide the best performance in a changing environment. On the market you can get nuts:

  • polyamide - designed for polyamide cable glands, i.e. made of plastic belonging to the group of polymers and characterized by very good mechanical strength and dimensional stability as well as appropriate electro-insulating properties. Polyamides do not perform well in a humid environment (they tend to swell), but their absorbability is not so high that they are not suitable for use as a material for glands,

  • Bakelite - Bakelite nut with the gland made of this material is characterized by non-flammability, insolubility, poor electrical conductivity, low thermal conductivity and relatively high chemical resistance,

  • polystyrene - polystyrene glands are characterized by high resistance to moisture and dimensional stability, hardness and good dielectric properties. Although they are quite fragile in comparison with bakelite, polyamide and brass ones, they are used wherever chemical indifference is important - polystyrene is characterized by high resistance to saline solutions, lye and non-oxidizing acids.

  • brass - glands made of brass are designed for difficult environmental conditions. They can withstand temperatures up to 200 degrees Celsius and are resistant to solvents, acids, oils and most other chemicals.