性欧美巨大丨日本精品视频一区丨国产在线不卡一区二区三区丨一级黄色性片丨亚洲精品自产拍在线观看亚瑟丨日韩成人三级丨日韩三级网址丨日本中文字幕一区二区丨精品久久a丨少妇高潮21p丨国产亚洲精品a在线观看下载丨亚洲aⅴ男人的天堂在线观看丨无码纯肉动漫在线观看丨无遮挡国产丨中文字幕日产乱码中文字幕丨久草资源网站丨在线播放毛片丨日韩欧精品无码视频无删节丨少妇裸体做爰免费视频网站丨欧美大片在线观看

Cup head socket head, socket screw, Stainless steel screw

Hex socket screw its force surface has six, relative to only two sides of the word screw and cross screw, cup head hexagon socket screw to bear more load.When used, the whole screw can sink into the inside of the machine to keep the smooth and beautiful surface of the machine.Compared to hexagonal bolts, it is convenient for assembly and maintenance, especially when used in narrow applications.Because the disassembly of the cup head inner hexagon screw must use a special wrench, ordinary people are not easy to remove, this is also one of the benefits.In addition, according to different use scenarios, the cup head socket hexagon screw has the specifications of M1.4-M30, you can choose the specifications suitable for your own products according to the use scenarios, or according to the drawings or samples of non-standard customization

Hardness and grade of cup head hexagon socket screws

Cup head hex socket screw according to hardness, tensile resistance, yield strength, there is a grade classification, that is, the level of hex socket screw.Hexagon socket screws can be divided into ordinary grade and high strength grade according to grade strength.Common hex socket screws refer to 4.8 and 8.8 grade, high strength cup head inner flow screws refer to 10.9 and 12.9 grade