The Russian Bridge Science and Production Center has recently developed new bolt standards for high-strength fasteners, marking an important step in the advancement of industrial fastening technology. These standards cover preloaded high-strength structural bolt assemblies, with several key parts outlined. Part 1 sets out the general requirements, while Part 2 details specific technical specifications. Parts 3 through 6 include various components such as s.s.s.s.s.s.s.s.s., which likely refer to different types of washers or specialized fastening elements. Part 6 specifically addresses Chamfer Flat Pads, highlighting the importance of precision in bolt assembly design.
The drafting of this standard is currently open for public discussion, allowing industry professionals, engineers, and manufacturers to provide feedback and suggestions. This collaborative approach ensures that the final standard will be both practical and widely accepted across the sector.
As part of its ongoing efforts to promote quality and safety in fastener manufacturing, the Golden Spider "Fasteners" quarterly editorial department continues to monitor and report on developments in this area. Their coverage helps keep the industry informed about the latest standards and best practices.
This initiative reflects a growing emphasis on uniformity and reliability in fastener systems, particularly in critical applications where structural integrity is paramount. With the involvement of multiple stakeholders, the new standard is expected to enhance performance, reduce failure risks, and support safer engineering solutions globally.
Aluminum Nitride Ceramic
The AIN crystal is a covalently bonded compound with a [AIN4] tetrahedron as a structural unit, and has a wurtzite structure and is a hexagonal system. Chemical composition AI 65.81%, N 34.19%, specific gravity 3.261g / cm3, white or grayish white, single crystal colorless and transparent, sublimation decomposition temperature under normal pressure is 2450 °C. It is a high temperature heat resistant material. Thermal expansion coefficient (4.0-6.0) × 10 -6 / ° C. Polycrystalline AIN has a thermal conductivity of 260W/(MK), which is 5-8 times higher than alumina, so it has good thermal shock resistance and can withstand extreme heat of 2200 °C. In addition, aluminum nitride is not attacked by aluminum liquid and other molten metals and gallium arsenide, and particularly has excellent corrosion resistance to molten aluminum liquid.
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