Caterpillar-style premium aftermarket hardened washer. Part reference 3K5234. Size/application: Washer 1 HD. Compatible bolt references in this catalog include 4F4042, 4J9058, 4J9208, 5P8136, 1J5607, 1J3527, 1D4637, 1D4635, 8J2928, 7X0481. Distributes clamping load and protects the joint surface in the matching heavy-equipment assembly. Brand compatibility: Caterpillar and premium aftermarket systems built to the matching Caterpillar specification. Standardized dimensions may also fit other major brands when diameter, thread, length and seat are identical. Confirm inside diameter and washer profile.