M20 x 1.5mm Fine Pitch Half Nuts (DIN 439) - Steel Gr.4 Zinc Plated Half Nuts, also known as Jam Nuts or Lock Nuts, are thin nuts that are frequently used in applications where a high thread engagement is required. Half Nuts can be used to hold another Hexagon Nut into position or alternatively can be utilised when a standard Full Nut is too thick for application. These Half Nuts are made from High Tensile Steel, and coated in a Bright Zinc Plating which provides a level of corrosion and oxidation resistance. For larger quantities or custom lengths, please email and one of our team will provide you with a quotation. M20 x 1.5mm Fine Pitch Half Nuts (DIN 439) - Steel Gr.4 Zinc Plated