※ 引述《Sodium (Sodium)》之铭言： : 这是高低牙自攻螺丝 : http://i.imgur.com/MpBiLFI.png : 最大特徵是螺丝牙有两种，高与低 : 我查询到的资料是说 可以降低物件被锁裂的风险 : 请问除了这个优点外 还有其他的吗?? : 谢谢前辈先进 引用http://www.shakeproof.com/products/threaded/hi-lo.html HI-LO® Fasteners - For Plastic and Other Low Density Materials Hi-Lo The HI-LO® fastener is the minimal performance solution for fastening in low pressure environments such as plastic, particle board, masonite, and wood. It ’s designed with a double-lead thread where the HI thread is sharper than a conventional one. More material is trapped in between the threads which helps to resist pull-out. This also allows for a lower driving torque. ADVANTAGES: Perfect screw for low-stress applications Reduced cracking in plastic bosses Smaller sized bosses can be designed to save in material and space Increased pull-out resistance AVAILABLE FEATURES: SEMS - add a washer under the head to span larger holes, protect fragile surfaces, and distribute load. The 30º included angle of the high thread displaces less material when it is driven into plastic or wood and, therefore, requires lower driving torques. A greater amount of material remains between the high threads, increasing the stripping torque. Low driving torque and high stripping torque provide maximum protection against stripping problems. -- 人生 不论拿到好牌或烂牌， 最重要的事——把牌打出好结果。 --

※ 发信站: 批踢踢实业坊(ptt.cc), 来自: 223.139.39.178 ※ 文章网址: https://webptt.com/cn.aspx?n=bbs/WoodworkDIY/M.1484894787.A.EE8.html 推 b9111111111b: thank you 01/20 21:20