WebSteel Heavy Hex Head Screwsfor High-Pressure Applications. These Grade B7 steel screws are nearly twice as strong as our stainless steel screws for high-pressure applications. Also known as pressure bolts, they meet the high- pressure, high-temperature regulations of ASTM A193 and are used to secure pressure tanks, valves, and flanges. http://www.medxtmc.com/articles/jlxlb7.html
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B7和弦组成音到底是啥?为啥有#F? - 知乎
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