Back Home / Fasteners / Nuts / HEX NUT UNC ZINC #4-40 GR 5 HEX NUT UNC ZINC #4-40 GR 5 SKU: N440 Categories: Fasteners, Nuts Hex machine screw nuts made from low carbon steel. Threads are Unified Standard, Class 2B. Designed to be used specifically with machine screws. Zinc plated. Size: #4-40. Case Quantity: 100 Log In For Pricing