the structural fastener is an internal longitudinal , reversible , gear - driven interlocking screw assembly and coupling device . the structural fastener uses a spring - loaded , gear driven coupler shaft with a threaded stud that mates with a female threaded socket so as to form an invisible joint that is easily decoupled . the structural fastener can be arranged in polar or linear arrays to increase its load - bearing capabilities , its air or water tight sealing capabilities or for redundancy . the structural fastener makes a rigid , reliable coupling between coupled members and forms a smooth external splice that is virtually invisible . the structural fastener is reversible , reusable , scaleable , precisely torqueable , and can be used with o - rings or sealing gaskets to provide air or water - tight seals . the structural fastener provides rapid assembly or non - destructive disassembly using simple hand tools or power - driven tools thus reducing the labor required to assemble the framing for adding a florida - style room or a greenhouse ; or erecting a garage , a pool enclosure or utility building ; or similar endeavors . the structural fastener can be scaled to meet various load - bearing requirements thus enabling manufacturers to produce shorter load - bearing members that can be assembled in a quick and efficient manner with simple tools and thus reduce shipping and labor costs .