This specification covers Grade 100 heat-treated alloy steel chain for such applications as slings, lifting assemblies, and load binding. The alloy steel shall be fully killed and have an austenitic grain size of five or finer. The steel shall be made by the electric welding or gas welding process. After welding, alloy steel chain shall be heat treated before applying the proof test. Heat and product analysis shall be performed and shall meet the required chemical composition in carbon, phosphorus, and sulfur. All chain shall be tested to at least the proof load and breaking force test specimen shall consist of a length from the lot containing at least the number of links. All chain shall be in the quenched and tempered condition before the elongation is measured.

1.1 This specification covers Grade 100 heat-treated alloy steel chain for such applications as slings, lifting assemblies, and load binding.

1.2 This specification is a performance standard for Grade 100 chain used between −20 and 400°F [−29 and 205°C]. The chain manufacturer should be contacted for use at temperatures outside this range.

1.3 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.

1.4 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.