The Pushnut 5/8-inch Axle Cap Set is engineered as a quick, reliable replacement for split pins and retaining rings. Each cap is precision-stamped from spring-tempered steel, then finished with ASTM-grade mechanical zinc plating to fight rust in warehouse, yard, or roadside conditions. Radial teeth flex over a 0.625 in. axle and lock tight, forming a vibration-proof hold without threads or tools. At only 0.47 in. tall, the low-profile dome protects cargo and operators while keeping debris out of wheel hubs. Ideal for fleet maintenance on delivery dollies, lawn trailers, and utility carts—this six-pack keeps mission-critical spares ready for instant repairs.