圓頭花齒頸螺栓

a) A ribbed neck screw is a type of fastener designed with a special feature on its shank or neck. Instead of a smooth or threaded surface, the neck of the screw has ribbed, serrated, or knurled features. These ribs or serrations provide additional grip and resistance when the screw is driven into a material, preventing it from rotating or loosening.

 
Description 
MaterialCarbon steel
Driving recess typeSlot recess
Head TypeTruss head
Thread TypeInch size
Surface colorZinc plating
Thread size / diameter1/4 - 20
Length1/2 or 5/8
Field of applicationConstruction / Garage door
Special featureRibbed neck
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