View Single Post
Old August 5, 2011, 07:28 AM   #17
Senior Member
Join Date: January 23, 2001
Location: People's Republic of Kanada
Posts: 1,652
These have the appearance of being made on modern machinery, with fully-formed cut threads along the complete shank; the machinery to do that didn't exist until relatively recently, and before that, mass-produced screws and bolts were usually made by either threading and heading round stock, or by rolling.
Gun control in Canada: making the streets safer for rapists, muggers, and other violent criminals since 1936.
SDC is offline  
Page generated in 0.10137 seconds with 7 queries