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Engineering (คำศัพท์วิศวกรรม) : ความหมายของคำว่า  A Sheet Metal Screw คือ ...
   
  A Sheet Metal Screw ความหมาย คือ (english) Sheet metal screws with (a) sharp-pointed ends; and (b) fewer threads per inch than type AB screws; and (c) deeper threads with bettere gripping power than type AB. The industrial Fasteners Institue incorrectly labes type A an “obsolete” thread though it is universally preferred in 18-8 stainless over type AB, especially by the marine industry.
   
 
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