Socket head cap screws are characterized by their high-strength alloy steel material,heat-treated to Grade 8.8,offering superior tensile and fatigue performance.The internal hex drive design enables high-torque installation with a low-profile head,making it perfect for compact spaces.The black oxide surface finish enhances wear resistance and provides mild rust protection while reducing the coefficient of friction.The cylindrical head design ensures even stress distribution and helps prevent loosening.The high-precision threads conform to ISO standards,guaranteeing compatibility with nuts.These screws also exhibit excellent impact resistance,suitable for dynamic load applications like robotics or drive systems.Moreover,their reusability and ease of maintenance make them a favorite in precision assemblies.Overall,socket head cap screws balance strength,size,and cost,making them an ideal choice for high-tech industries.
Socket head cap screw specifications conform to ISO 4762 or ASTM A574 standards.The diameter range is from M4 to M20,with lengths from 10mm to 150mm;for example,common lengths for M8 screws are 30-100mm.Head diameter and height are proportionally designed;an M8 head has approximately a 13mm diameter and 8mm height.The internal hex socket size corresponds to standard Allen keys(e.g.,M8 uses a 5mm key).Threads are metric full threads,with pitch varying by diameter(M8 pitch is 1.25mm).Surface finishes include black oxide,nickel plating,or zinc plating.The black oxide layer is about 0.5-1μm thick,providing corrosion resistance for up to 72 hours in salt spray tests.The material is alloy steel containing elements like chromium and molybdenum,with a minimum tensile strength of 150,000 PSI and a hardness of HRC 32-39.Packaging is typically in boxes of 50 or 200 pieces,often with specification labels for easy identification.
Socket head cap screws are extensively used in precision engineering,automotive manufacturing,aerospace,and electronic devices.In machine tools,they secure linear guides,spindles,and jigs,providing high-precision alignment.The automotive industry uses them in engine components,transmissions,and suspension systems,where they endure high vibration and temperature fluctuations.In aerospace,their high strength-to-weight ratio is utilized in airframe structures and instrument mounting.Electronic devices like computer servers and communication racks benefit from their low-profile heads to save space.Furthermore,in medical devices and automated robotics,these screws ensure reliable connections with minimal maintenance needs.Their applications often require tight tolerances and corrosion resistance,necessitating careful selection of surface finish based on the operating environment,such as opting for nickel-plated versions in humid conditions.
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