ความคิดเห็นที่ 21
Stud Bolt= a bolt with threads on both ends, to be screwed permanently into a fixed part at one end and receive a nut upon the other; - called also standing bolt.
Nut=a small (usually square or hexagonal) metal block with internal screw thread to be fitted onto a bolt
Screw=A metal pin with incised threads and a broad slotted head that can be driven as a fastener by turning with a screwdriver, especially:
a. A tapered and pointed wood screw.
b. A cylindrical and flat-tipped machine screw.
จากคุณ :
AnMe 
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18 ก.ย. 48 20:41:39
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