Design a turnbuckle to connect the rods of roof structure. Maximum pull in the the rods is 50 kN, The material of the coupler is FG 200 (S 200 N/mm²) and that of the rod is 30 CB (S400N/mm²) Factor of safety is 5. for threads M36x3 thread core dia 31.093 mm M42 x4.5 thread core dia 36.479 mm