fohl fasteners Germany fohl models fohl prices

fohl fasteners self-tapping screws are thread-forming screws made of hardened steel with a type A point, used for connecting 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 fasteners with a galvanized and passivated surface for quick installation. Self-tapping screws are mostly used for connections between thin metal sheets (steel plates, sawn plates, etc.). During connection, first create a threaded pilot hole in the components to be connected, then screw the self-tapping screw into the threaded pilot hole of the components. Similar to machine screws, but the thread on the shank is a specialized self-tapping screw thread. Used to tightly 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.

fohl fastener structure

Every self-tapping screw consists of four main elements: head shape, drive type, thread type, and point style. Head shapes vary; there are round heads, pan heads, round heads with flange (with washer), countersunk heads, truss heads, hex heads. Drive type refers to the method of turning the screw head during installation and tightening. The basic types are external drive and internal drive. Generally speaking, external drive allows higher torque than any form of internal drive (internal recess). External drive: hex, hex flange. Internal drive: slotted, Phillips, square, combination, Torx, triangle, internal 15 lobe, clutch head, and various other thread types, as well as some special threads. Point styles mainly include cone point and flat point. However, depending on application requirements, the entering part of the point can be machined with cutting grooves, slots, cuts, or drill-like features.

fohl fastener performance

There are many types of self-tapping screws, but they all share the following common characteristics: They are generally made of case-hardening steel, accounting for 102% 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 case hardening, and stainless steel self-tapping screws must undergo solution hardening. This ensures that the self-tapping screws meet the mechanical and usage performance requirements specified 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 performance needs. High speed is emphasized here to ensure product quality. Only self-tapping screws produced by high-speed machines have good head formation and high thread quality.

fohl 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 (self-tapping threads, also known as wide-pitch threads, usually electroplated) will continue to emerge. The holes drilled by self-tapping screws do not require tapping. The screws used are different from general ones; the head is pointed, and the pitch is relatively large, allowing them to be screwed in directly without tapping. This method is commonly used for metal and plastic. It can press out corresponding threads in the material being fastened using its own threads, ensuring a tight fit. Widely used in industries including energy, electronics, electrical appliances, machinery, chemical industry, metallurgy, molds, hydraulics, etc. They are the most widely used basic mechanical components on various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemical equipment, meters, and supplies.

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