heico-lock fasteners Germany heico-lock models heico-lock prices

heico-lock 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, firmly connecting these two parts into a single unit. This type of connection is called a stud connection and is also a detachable connection, mainly used when one of the connected parts has a large thickness, requires a compact structure, or is frequently disassembled, making bolt connections unsuitable. The press-fit nut stud has a hexagonal shape on one end and a cylindrical shape on the other, with an undercut groove between the hexagonal edge and the cylindrical section. Its interior features internal threads. By using a press to insert the hexagonal head into a pre-drilled hole in the thin plate, plastic deformation occurs around the hole's perimeter. The deformed portion is squeezed into the undercut groove of the press-fit nut stud, securing it tightly to the thin plate and thereby forming an effectively fixed internal thread on the thin plate.

heico-lock 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, and gearbox frames need to be installed. 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 connected bodies have significant thickness. The purpose of using double-ended studs for anti-loosening is that in actual work, external loads such as vibration, changes, and high-temperature creep of materials can reduce friction. At certain moments, the normal pressure in the thread 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 must be taken. Studs are applied in different usage environments and are widely used in power, chemical, oil refining, valves, railways, bridges, steel structures, automotive and motorcycle parts, machinery, boiler steel structures, tower cranes, large-span steel structures, and large buildings.

heico-lock fastener installation

Stud welding saves time and costs. All structural connections eliminate the need for drilling, punching, threading, riveting, tapping, and finishing steps, continuously expanding the application potential of structural design. It features high current and shallow penetration depth, allowing welding onto very thin sheets. Stud welding requires single-sided access. It supports all-position welding and, with the aid of extensions, can be applied to restricted vertical partitions. Due to the short welding time and minimal post-weld distortion, no finishing is required. Since the welded structure does not require drilling, leakage is prevented. The joint achieves high strength, meaning the stud weld joint strength exceeds the strength of the stud itself. How to install double-ended studs: Good economic efficiency. An advantage over other welding methods lies in the welding power. For mass-produced workpieces, standard studs are low-cost, and stud welding offers high quality reproducibility and a low scrap rate.

heico-lock fastener maintenance

During each maintenance, newly replaced studs and other newly replaced components should be inspected. The inspection should focus on the head and guiding part of the stud, strictly checking each part of the thread for cracks or indentations, and examining whether the tooth shape of the stud has changed. Check if the pitch is abnormal; if any abnormalities are found, the stud must not be used again. When installing the connecting rod cover, a torque wrench should be used. Tighten according to the specified standards; the torque should neither be too large nor too small. Also, pay attention to selecting bolts and studs from matching manufacturers. Therefore, regular maintenance of studs is necessary. Problems may arise due to long-term mechanical friction. When issues occur, the engine oil pan should be removed, and the condition of the engine bearings should be carefully checked. Check if the gap between the bearings is excessive; if so, replace them promptly.

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