crimping tool 22 has a small diameter cylindrical portion 24 and a lower end with a larger diameter cylindrical portion 25 a bore 26 extends from near the top end of cylindrical portion 24 and terminated adjacently the lower end of the portion 25 the lower end of the bore 26 terminates in a generally conically shaped section 27 into which extend a pair of isolated projections 28 and 29 the projections 28 and 29 are generally inclined relative to the axis of the bore 26 of the tool 22 and have a width which is chosen so as to provide the desired amount of locking area to provide the desired amount of locking torque in a preferred embodiment of the invention the incline of the projections 28 and 29 is at approximately a twenty degree angle to the normal or vertical axis of the tool 22 to provide an included angle of forty degrees this is a lesser angle than has been previously employed for this purpose and is possible due to the controlled deformation however for low height nuts it may be desirable to increase the angle of inclination of the projections 28 and 29 to limit the depth or distortion of the locking projections 17 and 18 in the finished nut 11 in addition it will be noted that the sides of the projections 28 and 29 are parallel along their entire length to minimize metal flow beyond the deformed areas 44 and 45 of the nut 11 the mandrel 23 has a cylindrical part 31 that.