The Phillips Flat Head Male & Female Interlocking Screw Set, widely known globally as Chicago screw or book binding screw, is a matched two-piece fastener assembly consisting of a male threaded stud with a Phillips flat head and a female cylindrical barrel nut with an internal thread. Unlike conventional one-piece screws that require separate nuts and washers for assembly, this interlocking pair realizes clamping and fixing by directly screwing the male component into the female barrel, forming an integrated locking structure without auxiliary fittings. It eliminates the risk of loose falling-off accessories during installation and use, delivering reliable connection performance for sheet materials, plates, leather goods, signboards, albums, menus and various splicing workpieces.
Manufactured with precision turning and thread rolling technology, this fastener set supports customized outer diameter, overall length, head thickness and slot specifications. Standard materials include carbon steel with electro-galvanized finish and SUS304 / SUS316 stainless steel, catering to indoor dry environment usage and outdoor moisture, corrosion-resistant application scenarios respectively. The Phillips cross slot on the flat head allows universal installation with standard Phillips screwdrivers, requiring no special tools, which greatly improves on-site assembly efficiency for mass installation projects.
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