At the end of the analysis, the best fitting systems were determined as follows: 1) the eccentric fitting system was best for labor costs; 2) the screw-in type fitting system was best for material costs; 3) the inserted bolt lock and T fitting systems were best for the energy used during the assembly process; and 4) the screw-in type fitting system was best for the total visible costs.
The assembly time periods for the panels (average standard time) were 69.11 seconds for the eccentric fitting, 75.12 seconds for the inserted bolt lock fitting, 80.30 seconds for the T fitting, 74.92 seconds for the screw-mounting fitting, 105.94 seconds for the screw-in type fitting, and 105.84 seconds for the bracket and strip fitting (Table 2).
The lowest direct labor cost related to the assembly of the fittings on the panels was $80.63 for the eccentric fitting, followed by the screw-mounting, inserted bolt lock, T, bracket and strip, and screw-in type fittings.
The lowest cost fitting system is the eccentric fitting, which has the lowest assembly time period from the aspect of direct labor, followed by the screw-mounting, inserted bolt lock, T.
In addition to having the lowest costs for direct labor, the eccentric fitting is the second lowest in terms of energy costs expended during the assembly stage of the fittings.