... . Double pitch conveyor chains with attachments: 2040,2050,2060,20809. Nickel-plated chains: 25NP,35NP,41NP,40NP,50NP10. Coupling chains Model428 428H ... ,40MN,A3 available hereTreatment1.Shot peening 2.Bluing 3.Phosphating4 .Nickel-plated 5.Zincing 6.Heat treatment7.Carburizing 8.Quenching 9.Tempering10 ...