Connected sets produced by the Company through the National Center for Construction Engineering Quality Supervision, Inspection and Testing, all items are standard. With the performance of not less than 45 carbon structural steel, mechanical properties, chemical composition consistent with GB699 standard bearer connection set of the flexor report force and tension capacity of the standard value is greater than the corresponding bearing capacity of reinforced? .10 times. 
 Connected sets is greater than the tensile strength of joints made of reinforced steel base metal tensile strength, greater than 0.9 times the measured tensile strength of steel base metal. 
 Accuracy is based on GB197 with the provisions of thread, the sleeve thread 6H-class, wire threaded 7g level, tooth type surface roughness according to the provisions of GB/T1031, Ra is 6.3um, the other processing parts of the surface roughness Ra is 12.5um. 
 Anti-embroidered surface treatment, no rust, oil, crack, Black and other defects. Both ends of the screw holes with plastic protection plugs.