Renold SD Simplex Double Cranked link (No. 30) Renold SD Simplex Double cranked link (No. 30) consists of an inner link with cranked link retained permanently in position by a rivet bearing pin. Features and Benefits Great range of sizes Excellent quality making them wear and fatigue resistant Product Application Information These chain links have been designed for machinery which is involved in construction and requires chain that can cope with heavy-duty applications. The products are fail-safe to ensure optimum efficiency and the safety of the machinery’s operators. Renold designs and manufactures roller chains for all types of construction machinery including dump trucks, excavators, loaders and fork lifts.