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Hooks and screws

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Hooks & Bolts

Hooks and bolts fall into the broad category of cable management components. The availability of different types of hooks and screws in the market is considerable. They can be used in many areas including electrical applications. These seemingly small parts can significantly affect the operation of certain connections. Therefore, they should always be matched according to their parameters.

Hooks and bolts: characteristics

Hooks and bolts play a very important role also in electrical engineering, since they are responsible for the durability of specific connections and wires. A hook is a device in the form of a curved metal bar that is used to hook, hold or suspend various types of loads. It is a basic device usually in craning equipment, being a part of a block or a sling. Each hook consists of: eye, ratchet, horn, throat and bolt. The basic parameters to be checked when choosing a hook are: lifting capacity, usually given in kilograms, throat size, and safety factor.

For an activity such as wire fixing, galvanized steel hooks are usually chosen. These are ideal for attaching overhead line clamps to pole poles, although they can also sometimes be used for attaching to building walls. They are normally manufactured in M16 and M20 thicknesses. Sometimes they can be available in M12 option. The most durable way to mount line fittings to overhead wires is with a stainless steel hook bolt. The industry standard, however, is hot-dip galvanized steel hooks, which are available on the market in several versions.

Any simple hook bolt for suspension of accessories such as end holders, through-holes and corner fasteners is ideal for insulated low voltage overhead power lines. Hook bolts are also suitable for installation in holes of ŻN concrete and E concrete poles as well as in building walls. In M16 and M20 thicknesses, they range from 160 to 600 millimetres in length. Hook bolts are usually equipped with two square washers and a nut. There are also expansion hook bolts, used in the installation of low voltage insulated line equipment into masonry walls when it is not possible to drill through the wall and install a standard hook bolt for the overhead connection. These types of hook bolts are steel studs, fitted with a hook. They are either M12 or M16 in diameter.

Hooks and bolts: hook types

A distinction is made between different hook types such as nut hooks, band hooks, shank hooks, base hooks and also stand hooks, so-called shackle hooks. Nut hooks are short hooks made of galvanized steel and connected to a nut with M16 or M20 thread. They are suitable for screwing onto the protruding threads of existing hook bolts. This application makes it possible to obtain a second hook on the pole of an insulated low voltage power line at low cost. Tape hooks are suitable for suspension of equipment on low voltage overhead lines and are suitable for installation on round E or wood pole with steel straps using a tensioning tool. Tape hooks are available in M16 and M20 thickness in short and long version. In the long version they are called distance hooks or distance-nut hooks if a particular model offers the possibility of fastening with a screw. A third group of hooks is the hook which is welded into a rigid steel clamp, suitable for suspending equipment on low voltage overhead power lines. They usually require an additional clamp for their installation. There are also hooks with bases, known as hook clamps with plate. These are used to mount line accessories on flat surfaces, such as walls, for example. Because they are used outdoors, they are protected from corrosion by hot-dip galvanizing. Standoff hooks, on the other hand, are used for mounting insulated overhead connections to low buildings, where it is necessary to lift the overhead line into the building on a steel pipe.