Abstract: A novel wire bundle bounding method that meets the requirements of aerospace specifications is disclosed as well as a novel cable tie used in the method. The method starts with a bundle of wires and the cable tie. The cable tie has a strap body and a locking head with first and second strap passages. The first and second strap passages each have a pawl that locks in the same direction. The strap body is then wrapped around at least one of the wires and then inserted through the first strap passage. Then the strap body is wrapped around the bundle and then inserted through the second strap passage. The strap body is then tightened and the residual strap portion clipped.