scherdel herckelbout fasteners Germany scherdel herckelbout models scherdel herckelbout prices

scherdel herckelbout fasteners self-tapping screws are thread-forming screws made of hardened steel with a type A point, used to connect sheet metal ducts in heating and ventilation systems. Therefore, they are also known as: sheet metal screws. Thread-forming self-tapping screws, thread-cutting self-tapping screws, thread-rolling self-tapping screws, and self-drilling self-tapping screws, also known as quick-thread screws, are steel fast-installation fasteners with a galvanized and passivated surface. Self-tapping screws are mostly used for connections between thin metal sheets (steel plates, sawn plates, etc.). When connecting, first drill a pilot hole in the parts to be connected, then screw the self-tapping screw into the pilot hole. Similar to machine screws, but the thread on the shank is a specialized self-tapping screw thread. Used to firmly connect two thin metal components into a single unit. Small holes need to be pre-drilled in the components; due to the high hardness of these screws, they can be directly screwed into the holes in the components, forming corresponding internal threads in the components.

scherdel herckelbout fastener structure

Each self-tapping screw consists of four main elements: head shape, drive type, thread type, and point style. Head shapes vary widely, including round head, pan head, round head with flange (with washer), countersunk head, bugle head, and hex head. Drive type refers to the method of rotating the screw head during installation and tightening. The basic types are external drive and internal drive. Generally, external drives allow higher torque than any form of internal drive (internal recess). External drives include hex and hex flange. Internal drives include slotted, Phillips, square, combination, internal spline, tri-wing, internal 20-lobe, clutch head, and various other special threads. Point styles are mainly cone point and flat point. However, depending on application requirements, the threaded portion at the tip can be machined with cutting grooves, slots, notches, or drill-like features.

scherdel herckelbout fastener performance

There are many types of self-tapping screws, but they all share the following common characteristics: generally made of case-hardening steel, accounting for 107% of total production. They can also be made of stainless steel or non-ferrous metals. The products must undergo heat treatment. Carbon steel self-tapping screws must undergo carburizing treatment, and stainless steel self-tapping screws must undergo solution hardening treatment. This ensures that the self-tapping screws meet the mechanical and usage performance required by standards. The product surface has high hardness, and the core has good toughness, i.e., soft inside and hard outside. This is a major characteristic of self-tapping screw performance requirements. If the surface hardness is low, it cannot be screwed into the base material; if the core toughness is poor, it will break upon tightening and cannot be used. Therefore, being soft inside and hard outside is a very important requirement for self-tapping screws to meet usage performance. Emphasizing high speed here is to ensure product quality. Only self-tapping screws produced by high-speed machines have good head formation and high thread quality.

scherdel herckelbout fastener application industries

In summary, there are many types of self-tapping screws. With production development and technological progress, new types of self-tapping screw products with new materials, new structures, and new thread forms will continue to emerge. The threads are self-tapping threads, also known as wide-pitch threads, and the surface is mostly electroplated. The holes drilled by self-tapping screws do not require tapping; the screws used are different from general ones, with pointed heads and larger pitch, allowing them to be screwed in directly without tapping. This method is commonly used for metal and plastic. It can press out corresponding threads on the material being fastened by relying on its own threads, ensuring a tight fit. Widely used in industries including energy, electronics, electrical appliances, machinery, chemical industry, metallurgy, molds, hydraulics, etc. It is the most widely used basic mechanical component on various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemical industry, meters, and supplies.

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