Screws / sheet metal screws / special screws
1 to 16 (from a total of 51)
Screw head
The head of a screw is used to screw the screw into the workpiece and also serves optical purposes. A distinction is made between the head shape (e.g. countersunk head, lens head, external hexagon, cylinder head, etc.) and the drive. There are many different types of drive for screws. External or internal hexagons are typical in the field of mechanical engineering. In the past, the longitudinal slot was common, which was improved by the Phillips PH cross slot and the Pozidriv PZ cross slot. Nowadays, TORX® drives are particularly popular because they enable better power transmission. We also have over 15 different screws with a safety drive [Link]
Production of screws
The production of screws with a head is usually carried out using the cold extrusion process, in which wire as the starting material is shaped in such a way that the desired screw head is formed. The thread is then applied without cutting using a thread rolling machine. A process that is rather rare in mass production is the hot pressing process (forging), in which round material in bar form is heated to over 1000°C and then shaped. The thread is usually applied using a CNC milling machine.
Types of screws
The number of different types of screws that we carry is very high. For example, a distinction must be made between machine screws, threaded screws, wood screws (e.g. chipboard screws, patio screws or screws for drywall construction, the so-called plasterboard screws). Another way to differentiate between screws is the type of thread: screws with metric threads, wood threads, thermoplastic threads, sheet metal threads or a thread-forming thread, which leaves a metric thread after unscrewing, for example.
Corrosion and rust protection
Corrosion is the biggest enemy of screws. Water, whether through direct contact or the water content in oxygen, causes screws to rust unless they are protected from the weather by corrosion protection or are made of a special steel, stainless steel. Stainless screws, usually A1 and A2, offer limited rust protection, while highly acid-resistant steels such as A4 and A5 are also resistant to acids or salt water. The far larger class of screws, however, are made of bare steel with variable strength (e.g. 4.6, 8.8 or the high-strength materials 10.9 or 12.9). These are usually bare, i.e. untreated, and rust 'immediately'. The most common treatment is electrogalvanizing, but hot-dip galvanizing, zinc flake coating, burnishing, phosphating or chromating are also common processes that protect against rust.
Thread forms
Most screws on the European market have a metric standard thread, which is also called a right-hand thread. In addition, we offer left-hand thread, trapezoidal thread, inch thread or fine thread screws. The advantage of the fine thread is a larger number of threads. This means that many more threads mesh with each other. When screwing in, the screw has to be turned more often, but a better hold and also better tightness against liquids or gas (see gas thread) is achieved.
The head of a screw is used to screw the screw into the workpiece and also serves optical purposes. A distinction is made between the head shape (e.g. countersunk head, lens head, external hexagon, cylinder head, etc.) and the drive. There are many different types of drive for screws. External or internal hexagons are typical in the field of mechanical engineering. In the past, the longitudinal slot was common, which was improved by the Phillips PH cross slot and the Pozidriv PZ cross slot. Nowadays, TORX® drives are particularly popular because they enable better power transmission. We also have over 15 different screws with a safety drive [Link]
Production of screws
The production of screws with a head is usually carried out using the cold extrusion process, in which wire as the starting material is shaped in such a way that the desired screw head is formed. The thread is then applied without cutting using a thread rolling machine. A process that is rather rare in mass production is the hot pressing process (forging), in which round material in bar form is heated to over 1000°C and then shaped. The thread is usually applied using a CNC milling machine.
Types of screws
The number of different types of screws that we carry is very high. For example, a distinction must be made between machine screws, threaded screws, wood screws (e.g. chipboard screws, patio screws or screws for drywall construction, the so-called plasterboard screws). Another way to differentiate between screws is the type of thread: screws with metric threads, wood threads, thermoplastic threads, sheet metal threads or a thread-forming thread, which leaves a metric thread after unscrewing, for example.
Corrosion and rust protection
Corrosion is the biggest enemy of screws. Water, whether through direct contact or the water content in oxygen, causes screws to rust unless they are protected from the weather by corrosion protection or are made of a special steel, stainless steel. Stainless screws, usually A1 and A2, offer limited rust protection, while highly acid-resistant steels such as A4 and A5 are also resistant to acids or salt water. The far larger class of screws, however, are made of bare steel with variable strength (e.g. 4.6, 8.8 or the high-strength materials 10.9 or 12.9). These are usually bare, i.e. untreated, and rust 'immediately'. The most common treatment is electrogalvanizing, but hot-dip galvanizing, zinc flake coating, burnishing, phosphating or chromating are also common processes that protect against rust.
Thread forms
Most screws on the European market have a metric standard thread, which is also called a right-hand thread. In addition, we offer left-hand thread, trapezoidal thread, inch thread or fine thread screws. The advantage of the fine thread is a larger number of threads. This means that many more threads mesh with each other. When screwing in, the screw has to be turned more often, but a better hold and also better tightness against liquids or gas (see gas thread) is achieved.