Fastener cap

Abstract

A fastener cap includes a shank having a longitudinal hole with a closed first end and an open second end. The shank further includes at least one engaging section on an inner wall delimiting the longitudinal hole. The engaging section has an inner diameter smaller than that of a remaining portion of the longitudinal hole. The engaging section is engaged with threading of an exposed portion of a shank of a screw and thus shields the exposed portion of the shank of the screw. The closed first end of the fastener cap improves the rust-preventing effect for the screw.

1 . A fastener cap comprising: 
 a shank comprising a longitudinal hole, the shank further comprising a closed first end and an open second end, the shank further comprising at least one engaging section on an inner wall delimiting the longitudinal hole, said at least one engaging section having an inner diameter smaller than that of a remaining portion of the longitudinal hole, said at least one engaging section being adapted to engage with threading of an exposed portion of a shank of a screw.    
   
   
       2 . The fastener cap as claimed in  claim 1  wherein the longitudinal hole of the fastener cap has a diameter slightly greater than that of exposed portion of the shank of the screw.  
   
   
       3 . The fastener cap as claimed in  claim 1  wherein said at least one engaging section includes an annular teeth.  
   
   
       4 . The fastener cap as claimed in  claim 1  wherein said at least one engaging section is substantially triangular in section.  
   
   
       5 . The fastener cap as claimed in  claim 1  wherein the fastener cap further comprises a head on the closed first end thereof.  
   
   
       6 . The fastener cap as claimed in  claim 1  wherein said at least one engaging section is formed on an intermediate portion of the inner wall of the tubular shank of the fastener cap.