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17.1 Engineering Class Chains – round parts configurations.
The construction of Engineering class chain is generally comparable. Configuration of pin and bush does vary and to assist in identification can be categorised as follows.
17.2 Forged Chain pins
For standard pin alloy steel material case hardened to 54/58 Hrc is the standard and proven specification.
Where corrosion resistance is required Pins are also manufactured in 420 through hardened to 45 Hrc or as is the option with this direct hardening steel surface induction hardened where a higher surface hardness value is required (Typically 54/58 and an average depth of 1.5 mm). Where considered appropriate higher mechanical properties and hardening values can be achieved with 440.
Pins are available in a variety of styles dependent on chain format and working environment. Refer to John King technical for recommendations.