Z-ring chains feature the patented Z44 sealing rings, which greatly improve performance and wear life, making previous X-ring and Z-ring chains obsolete 50% reduction in friction compared to traditional o-rings Constant lubrication from special high-temperature grease in the critical pin/bushing area provides long life High-carbon alloy pins to minimize wear and increased roller thickness to prolong durability Thicker outer plates and quad-riveting for greater tensile strength Rivet type link included. CHAIN 520ZRP X 120 LINKS
