electrical terminal 100 fig5 and 6 to a substrate 110 fig5 and 6 provided on an aircraft a railway line and so on the fixing device comprises a bush 20 a dowel 50 and a weak region 70 interconnecting the bush 20 and the dowel 50 the fixing device may be cast machined or cold formed as a unitary item from aluminum copper stainless steel or titanium and finally machine finished to a high standard before possibly being provided with a coating the bush 20 has a cylindrical body 22 defining front and rear ends 24 26 and a bore 28 extending axially therethrough the cylindrical body 22 is intended for location in an opening 112 in the substrate 110 and is sized to engage closely the portion of the substrate inside the opening 112 such that electrical energy may be conducted between the bush 20 and the substrate 110 the bush 20 also includes a plate 30 provided on the front end 24 of the cylindrical body 22 and is sized to extend radially someway therebeyond the plate 30 has a generally planar rear face 36 and a generally planar front face 38 to which the terminal 100 can be secured an aperture 40 is formed in the centre of the plate 30 for allowing the passage of a screw 114 bolt or other mechanical fastener to be discussed below in connection.