ASTM A391/A391M-07(2012)

1.1 This specification covers Grade 80 heat-treated alloy steel chain for such applications as slings, lifting assemblies, and load binding.

1.2 The Grade designation is ¹/₁₀ of the minimum breaking strength in newtons divided by two times the nominal cross-sectional area of the chain in square millimetres.

1.3 The values stated in either SI units or in other units shall be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system must be used independently of the other, without combining values in any way.