Patent ID: 8801336

Claim:
A rock bolt comprising: an elongate tubular shank which has a defined outer diameter, an external surface which has an external surface diameter less than said defined outer diameter, an inner bore with an inner diameter and which elongate tubular shank has a first end and an opposing second end; keying formations formed on the external surface of the elongate tubular shank, said keying formations forming said defined outer diameter of said elongate tubular shank; and a component comprising a body with a defined external shape and with a component inner passage formed through said body and into which component inner passage the first end of the elongate tubular shank slidably extends, which component inner passage has a smooth component inner passage surface and has a component inner passage diameter which is substantially equal to the defined outer diameter of the tubular shank, which component is placed on an end of the external surface of the elongate tubular shank with said component inner passage surface in contact with said keying formations, is fixed to the end of the elongate tubular shank by welding of said component body to said keying formations and to said external surface of said elongate tubular shank and which component external shape is a nut with a hexagonal outer surface.