mottura fasteners Germany mottura model mottura price

mottura 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 screwed on, tightly connecting these two parts into a single unit. This type of connection is called a stud connection, which is also a detachable connection, mainly used when one of the connected parts has greater thickness, requires a compact structure, or frequent disassembly makes bolt connections unsuitable. The press-fit nut stud has a hexagonal shape at one end and a cylindrical shape at the other, with a relief groove between the hexagonal edge and the cylindrical section. Its interior features internal threads. By using a press 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 firmly onto the thin plate and forming an effective fixed internal thread.

mottura fastener applications

A stud refers to a cylindrical fastener with threads on both ends. It is used in large equipment where accessories need to be installed, such as sight glasses, mechanical seal seats, gearbox frames, etc. In these 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 substantial, and double-ended bolts are employed to prevent loosening. In actual operation, external loads such as vibration, changes, and high-temperature creep of materials can reduce friction. At certain moments, the normal pressure in the threaded pair disappears, resulting in zero friction, which causes the threaded connection to loosen. If this happens repeatedly, the threaded connection will become loose and fail. Therefore, anti-loosening measures for studs must be applied according to different operating environments. They are widely used in power generation, chemical industry, oil refining, valves, railways, bridges, steel structures, automotive and motorcycle parts, machinery, boiler steel structures, cranes, large-span steel structures, and large buildings.

mottura 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, high current, and smaller melt depth. Therefore, they can be welded onto very thin plates. Stud welding workpieces must be welded from one side. They can be welded in all positions, and with the help of extenders, even on restricted vertical partitions. Due to short-duration welding and minimal post-weld distortion, no trimming is required. Since the welded structure does not require drilling, there will be no 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: Good economic efficiency compared to other welding methods lies in welding power. For mass-produced workpieces, standard studs are low-cost, and stud welding offers higher quality reproducibility and lower scrap rates.

mottura fastener maintenance

During each maintenance session, newly replaced studs and other accessories should be inspected. Focus 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 occur, they must not be used again. When installing the connecting rod cap, use a torque wrench. Tighten according to specified standards—torque should neither be too large nor too small—and ensure matching manufacturer bolts and studs are selected. Regular maintenance of studs is essential. Under prolonged mechanical friction, issues may arise. When problems occur, remove the engine oil pan and carefully inspect the condition of the engine bearings, checking whether the gap between the bearings is excessive. If the gap is too large, replace them promptly.

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