Although the quality of the high strength hex socket bolts is still relatively good, it can meet the basic strength requirements, but sometimes the fatigue strength is too large for us to imagine, and the high-strength hex bolts will also break. Here is a detailed analysis of the specific reasons:
The high strength hex socket bolts can be loosened in a transverse vibration test for only one hundred times, and it needs to be repeatedly vibrated one million times in the fatigue strength test. In other words, the high-strength hex bolt is loose when using one ten-thousandth of its fatigue strength. We only use one ten-thousandth of its large capacity, so the looseness of the high-strength hex bolt is not because of the bolt. Fatigue strength.
After the high-strength hex bolt is loosened, a huge kinetic energy mv2 is generated. This huge kinetic energy directly acts on the bolt and the equipment, causing the bolt to be damaged. After the bolt is damaged, the equipment cannot work under normal conditions, further causing damage to the equipment. Fasteners that are subjected to axial forces, the threads are broken and the bolts are broken. For fasteners that are subjected to radial forces, the bolts are sheared and the bolt holes are made elliptical.
In the case of vibration and impact, the high-strength hex bolt will loosen. However, since the loosening direction of the tightening nut is the tightening direction of the lock nut, the tightening of the lock nut just prevents the loosening of the tightening nut. Retracting, the tightening nut cannot be loosened.
ASTM A490 Hex Head Bolt
ASTM A490 Hex Head Bolt Standard: ISO, JIS, GB, ANSI, BSW, DIN or non standard as customize. Material: Carbon Steel, Stainless Steel, steel, aluminum,brass, titanium, Copper,etc Size: M2-M52 or non-standard as request & design Length: M10-M300 as request & design Grade: 4.8,6.8,8.8,10.9,12.9,A2-70,A4-80,etc Surface Treatment: Zn- Plated, Ni-plated, Passivated, Tin-plated, Sandblast and Anodize, Polish, Electron Painting,Black […]
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