Federal Specification, Chains and Attachments, RR-C-271E, Dec 2010
This specification covers welded and weldless chain of commercial quality together with sundry attachments (links and shackles) most commonly used with this chain.
NACM Welded Steel Classification
These specifications cover properties and grades of welded steel chain for industrial and commercial uses produced to accepted commercial tolerances.
IACS Anchor Testing reqs
INTERNATIONAL ASSOCIATION OF CLASSIFICATION SOCIETIES Requirements concerning MOORING, ANCHORING AND TOWING