American Standard Welded Link Chain American standard welded link chain is a sort of welded link chain complying with standards of ASTM & NACM. The American standard welded link chain provided includes grade 30 proof coil chain, grade 43 high test chain, grade 70 transport chain, grade 80 alloy chain, and grade 100 alloy chain. Besides, we are also able to customize non-standard welded link chain.