How to judge whether the chain shackles are qualified?

1. Material compliance: Generally, alloy steel is selected for manufacturing. 2. Breaking force test results should meet the design requirements. 3. Surface hardness test should comply with the design requirements. 4. Assembly dimensions should conform to the design requirements. 5. Thread assembly should be free of abnormalities. Surface anti - corrosion treatment should be in place. 6. When conditions permit, try to choose chain shackles produced by forging process.