The Genk USA 40010212 Automatic Slack Adjuster is a precision-engineered component designed to optimize brake performance in heavy-duty vehicles. With a 6” arm length, 28 splines, and a 1.50” spline diameter, it ensures a secure and universal fit. Built from durable, corrosion-resistant materials, it offers long-lasting reliability. Compatible with a wide range of replacement numbers, this slack adjuster is a versatile and cost-effective solution for maintaining optimal brake function in your fleet. Replacement Numbers: 4798, 61015, 214618, 315302, 808137, 808174, 813639, 813649, 818142, 1191689, 1191690, 3946099, 6450554, 6450884, 6910621, 10600163, 13209010, 40010212, 40501308, 40501314, 50010212