A-A-52507
2.2 Heat treatment. Cross chains shall be case hardened by carburizing or carbonitriding to a case depth as specified in NACM-5179 (TC) and shall have a Rockwell hardness C53 minimum or equivalent.
2.3 Design and construction. Unless otherwise specified herein, chain assembly components shall conform to the requirements specified in NACM-5179 (TC), such as wire sizes, dimensions, and tolerances.
2.3.1 Chain assemblies. Chain assemblies shall be comprised of side chains, cross chains, side chain fasteners, and cross chain hooks as illustrated in figure 1. Chain assemblies shall be constructed and selected for the tire sizes listed in table I. For the tire sizes listed in table II, chain assemblies shall conform to the requirements as specified in table II.
2.3.1.1 Cross chains. Cross chains shall be constructed of regular, twist link chain.
2.3.1.2 Side chain fasteners. Side chain fasteners shall provide a secure attachment to one side chain end, and shall provide a quick, secure lock to the other side chain end. The lock shall be readily opened and closed. Side chain fasteners shall not be open-type keeper links.
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