M30 x 1.5mm Fine Pitch Half Nuts (DIN 439) - Steel Gr.4 Self Colour 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 Gr.4 High Tensile Steel and have a black self colour finish. For larger quantities or custom lengths, please email and one of our team will provide you with a quotation. M30 x 1.5mm Fine Pitch Half Nuts (DIN 439) - Steel Gr.4 Self Colour