Grade 70 transport chain is a kind of welded carbon steel link chain. The chain is an improvement over high test chain. Load rating of grade 70 chain are approximately 20% higher than grade 43. Grade 70 transport chain meets ASTM and NACM standards. The chain is most popular in the cargo industry as trailer tie downs, however the chain is not used for overhead lifting purposes.
The grade 70 transport chain generally features a gold chromate finish, which makes it easily identifiable. Besides, it is usually embossed with 7, 70 or 700.

Transport Chain ASTM80(G70)

Rade Size Material Diameter Working Load Limit Proof Test Breaking Force Minimum Max Length Per 100 Links 　Max Weight Per 100 Feet IN IN MM LBS KG LBS KN LBSL KN IN M LBS KG 1/4 0.281 7.1 3150 1430 6300 28.0 12600 56.1 98 2.49 84 38 5/16 0.343 8.7 4700 2130 9400 41.8 18800 83.6 110 2079 120 54 3/8 0.406 10.3 6600 3000 13200 58.7 26400 117.4 134 3.40 176 80

Transport Chain NACM84/90 (G70)

Nominal Size Material Diameter Working Load Limit Proof Test (Min) Breaking Force Min Inside Length Inside Width MM IN MM IN KG LBS KN LBS KN LBS MM IN MM IN 7.0 1/4 7.0 0.276 1430 3150 27.0 6100 53.9 12100 31.5 1.24 9.8 0.38 8.0 5/16 8.7 0.343 2130 4700 41.6 9400 83.5 18800 33.5 1.32 12.2 0.48 10.0 3/8 10.0 0.394 2990 6600 55.0 12400 110.0 24700 35.0 1.38 14.0 0.55

Transport Chain NACM96 ( G70 )

Nominal Size Material Diameter Working Load Limit Proof Test(Min) Breaking Force Min Inside Length Inside Width MM IN MM IN KG LBS KN LBS KN LBS MM IN MM IN 7.0 1/4 7.0 0.281 1430 3150 28.0 6300 56.0 12600 31.8 1.24 9.8 0.38 8.7 5/16 8.7 0.343 2130 4700 41.8 9400 83.6 18800 32.8 1.29 11.2 0.44 10.0 3/8 10.3 0.406 2990 6600 58.7 13200 117.4 26400 35.0 1.38 14.0 0.55