Product Info Catalog Hardware Fasteners Nuts Nylon Insert Lock Nut, Zinc Plated Steel, Coarse Thread, 100-Pk., 0.25-20 Nylon Insert Lock Nut, Zinc Plated Steel, Coarse Thread, 100-Pk., 0.25-20 Request a Quote UPC: 08236072877 SKU: 312553 Model Number: 7180147 100 Pack, 1/4x20-Inch-Inch, Coarse Thread, Zinc Plated Steel, Nylon Insert Lock Nut.