FASTENERS / NUTS / HEAVY FLEX LOCK NUT Filters Finish BLACK ZINC Your Results Showing 1 - 1 of 1 results. 1 NYLON INSERT LOCK NUTNM & NE SERIESIFI 100/107 SAE J99566 NYLON INSERT 250 MAX TEMPPROOF LOAD 90KSI Part Number Description Grade Finish Type 001-03125C-FX 5/16-18 HEV FLEX LOCKNUT STEEL ZINC STANDARD 1