※ 引述《Sodium (Sodium)》之銘言： : 這是高低牙自攻螺絲 : http://i.imgur.com/MpBiLFI.png : 最大特徵是螺絲牙有兩種，高與低 : 我查詢到的資料是說 可以降低物件被鎖裂的風險 : 請問除了這個優點外 還有其他的嗎?? : 謝謝前輩先進 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 不論拿到好牌或爛牌， 最重要的事——把牌打出好結果。 --

※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 223.139.39.178 ※ 文章網址: https://webptt.com/m.aspx?n=bbs/WoodworkDIY/M.1484894787.A.EE8.html 推 b9111111111b: thank you 01/20 21:20