Self-drilling expanding anchor bolt

A self-drilling expanding anchor bolt and a drilled hole, comprising:

• a drill bit for drilling;
• an anchor rod connected to the drill bit;
• an expanding sleeve surrounding the anchor rod, the anchor rod having an expansion cone at a first end adjoining the drill bit, having a neck region behind and contiguous with the expansion cone, and having a threaded segment at a second end of the neck region remote from the drill bit, the expansion cone expanding the expanding sleeve in a radial direction when the expansion cone is pulled into the expanding sleeve;
• and
• a transition part between the drill bit and the expansion cone of the anchor rod, a maximum diameter of the transition part being smaller than a diameter the drill bit;
• wherein a difference between the diameter the drill bit and the maximum diameter of the transition part is no greater than a thickness of the expanding sleeve.

A self-drilling expanding anchor bolt and a drilled hole, comprising:

• a drill bit for drilling;
• an anchor rod connected to the drill bit;
• an expanding sleeve surrounding the anchor rod, the anchor rod having an expansion cone at a first end adjoining the drill bit, having a neck region behind and contiguous with the expansion cone, and having a threaded segment at a second end of the neck region remote from the drill bit, the expansion cone expanding the expanding sleeve in a radial direction when the expansion cone is pulled into the expanding sleeve;
• a transition part between the drill bit and the expansion cone of the anchor rod, a maximum diameter of the transition part being smaller than a diameter the drill bit;
• and
• a chamfer at the junction of the drill bit and the transition part.

A self-drilling expanding anchor bolt and a drilled hole, comprising:

• a drill bit for drilling;
• an anchor rod connected to the drill bit;
• an expanding sleeve surrounding the anchor rod, the anchor rod having an expansion cone at a first end adjoining the drill bit, having a neck region behind and contiguous with the expansion cone, and having a threaded segment at a second end of the neck region remote from the drill bit, the expansion cone expanding the expanding sleeve in a radial direction when the expansion cone is pulled into the expanding sleeve;
• and
• a transition part between the drill bit and the expansion cone of the anchor rod, a maximum diameter of the transition part being smaller than a diameter the drill bit;
• wherein a height of the transition part is less than a height of the drill bit.