LINCOLN INDUSTRIAL, 1/8 NPTF, 3/4 Length, Button Head Grease Fitting, Metallic The LINCOLN INDUSTRIAL LNI-5701 is a button head grease fitting designed for high-volume lubrication needs in heavy machinery and industrial applications. This fitting features a 1/8 NPTF male thread and a straight configuration, making it suitable for direct and efficient grease delivery. Constructed with heat-treated and zinc-plated components, the LNI-5701 offers exceptional durability and corrosion resistance, ensuring a long service life in demanding environments.