1. Fasteners should be made of malleable cast iron with mechanical properties not less than KTH330-08.

2. Castings should not have cracks or pores; they should not have shrinkage, blisters or other casting defects that affect use; and sand sticking, pouring riser residues, cracks, burrs, etc. that affect the appearance quality should be removed. Remove the scale and other oxides.

3. The fitting surface between the fastener and the steel pipe must be strictly shaped to ensure good contact with the steel pipe when fastened.

4. The active part of the fastener should be able to rotate flexibly, and the gap between the two rotating surfaces of the rotating fastener should be less than 1mm.

5. When the fastener clamps the steel pipe, the minimum distance between the openings should be no less than 5mm.

6. The surface of fasteners should be treated with anti-rust treatment.

7. The fastener bolts shall not be damaged when the tightening torque reaches 70N?m.

8. The individual weight of right-angle fasteners shall not be less than 1.347kg, the individual weight of rotating fasteners shall not be less than 1.490kg, and the individual weight of butt fasteners shall not be less than 1.878kg.

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