Starting at 3/8” nominal diameter, D-LOC’s are inventoried up to 2-1/2”. Stocking grades include ASTM-A194, grades 2 & 2H and ASTM-A563, grades A-C & DH. Standard finishes are plain, zinc and hot dipped galvanized. Threads are UNC and 8UN. Samples are available. Special D-LOC’s can be manufactured up to 18” nominal diameter, with all types of standard and non-standard threads. DYSON can also produce special D-LOC’s in a wide variety of shapes, sizes and materials. The D-LOC principle can be applied to thick, jam, flange and coupling nuts. These customized lock nuts can be hexagon or square patterns. Other materials available include alloys, stainless & other exotics.