This British Standard specifies material, dimensions, characteristics and identification of sinteredbronze plain and flanged oil?retaining bushes and oil?retaining thrust washers for aircraft use. Thebushes are charged with lubricating oil and have a normal oil content of from 25% - 30% by volume,within the size range from 3/16 in. (4.8 mm) to 2 in. (63.5 mm) nominal bore.