推 kidd0932: 一般螺絲行都定的到 02/15 17:46
※ 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。
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※ 文章網址: https://www.ptt.cc/bbs/WoodworkDIY/M.1484894787.A.EE8.html
推 b9111111111b: thank you 01/20 21:20