0BA Half Nuts (BS 57:1951) - Steel 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 have a BA Thread. BA, or British Association Thread, was introduced in 1884 and is gradually being phased out in favour of metric fasteners, but it is still widely used in various sectors around the UK. These Half Nuts are made from Self Colour Steel. For larger quantities or items not listed, please email and one of our team will provide you with a quotation. 0BA Half Nuts (BS 57:1951) - Steel Self Colour