zafirakis fasteners Germany zafirakis model zafirakis price

zafirakis fastener studs are a type of fastener used in sheet metal, thin plates, chassis, and cabinets. During connection, one end must be screwed into a part with an internal threaded hole, while the other end passes through a part with a through-hole, and then a nut is tightened to securely join the two parts into a single unit. This type of connection is called a stud connection, which is also a detachable connection. It is mainly used when one of the connected parts has a large thickness, requires a compact structure, or frequent disassembly makes bolted connections unsuitable. The press-fit nut stud has a hexagonal shape on one end and a cylindrical shape on the other, with a relief groove between the hexagonal edge and the cylindrical section. Its interior features internal threads. By using a press machine to force the hexagonal head into a pre-drilled hole in the thin plate, plastic deformation occurs around the hole's perimeter. The deformed portion is forced into the relief groove of the press-fit nut stud, securing it tightly to the thin plate and forming a stable internal thread.

zafirakis fastener applications

A stud refers to a cylindrical fastener with threads on both ends. It is used in large equipment where accessories such as sight glasses, mechanical seal seats, gearbox frames, etc., need to be installed. In such cases, one end of the stud is screwed into the main body, and after installing the accessory, a nut is placed on the other end. Studs are used when the thickness of the connected bodies is significant, aiming for anti-loosening purposes in double-ended bolt connections. In practical work, external loads such as vibration, changes, high-temperature creep of materials, etc., can reduce friction, causing the normal pressure in the threaded pair to disappear momentarily, resulting in zero friction and loosening of the threaded connection. If this happens repeatedly, the threaded connection will become loose and fail. Therefore, anti-loosening measures must be applied. Studs are widely used in various environments including power generation, chemical industry, oil refining, valves, railways, bridges, steel structures, automotive and motorcycle parts, machinery, boiler steel structures, cranes, long-span steel structures, and large buildings.

zafirakis fastener installation

Studs save time and costs as all structures do not require drilling, punching, threading, riveting, screwing, or finishing steps, continuously expanding the application potential of structural design. They support high current and have a smaller melt depth, allowing welding onto very thin plates. Stud welding must be performed from one side of the workpiece. Full-position welding is possible, and with the help of extenders, it can even be done on restricted vertical partitions. Due to the short welding time and minimal post-weld deformation, no trimming is required. Since welded structures do not need drilling, there is no risk of leakage. Joints can achieve very high strength, meaning the joint strength of stud welding exceeds the strength of the stud itself. How to install double-ended bolts offers good economic benefits compared to other welding methods, particularly in terms of welding power. For mass-produced workpieces, standard studs are low-cost, and stud welding provides higher quality reproducibility and lower scrap rates.

zafirakis fastener maintenance

During each maintenance session, newly replaced studs and other components should be inspected. Focus particularly on the head and guiding sections of the studs, strictly checking each part of the threads for cracks or indentations. Also examine the tooth shape of the studs for any changes. Check if the pitch is abnormal; if abnormalities are found, the studs must not be used again. When installing the connecting rod cover, use a torque wrench. Tighten according to specified standards—neither too tight nor too loose—and ensure that bolts and studs from compatible manufacturers are selected. Regular maintenance of studs is essential. Over time, mechanical friction can cause issues. When problems arise, remove the engine oil pan and carefully inspect the condition of the engine bearings. Check if the clearance between the bearings is excessive; if so, replace them promptly.

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