Chicago Screw Chicago Screw is a specially designed fastener consisting of two parts: mother screw and daughter screw. This design is typically used in situations that require high safety and anti disassembly. Product Display 304 Stainless Steel Chicago Screws Chicago Screw Gold Plated Chicago screws black zinc plated Chicago Screw Black Oxide Hexagon socket Chicago screws Cross recessed Chicago screws Flat head Chicago screw Pan Head Chicago Screws Custom Chicago Screws Chicago Screws with Tooth Slotted Chicago Screws Carbon Steel Slotted Chicago Screws Standard bolts & nuts View more Various standard parts are available for immediate delivery Non-standard custom fasteners View more Customize various non-standard fasteners, anti-theft fasteners, special-shaped fasteners COLD HEADING WORKSHOP COLD HEADING WORKSHOP