Attachment device for fixing on a plate having a hole and assembly comprising such an attachment device

An attachment device changeable between an unengaged state and an engaged state, comprising:

• a nut member extending along an axis and having an axial thread-engaging bore, wherein the nut member comprises blocks, the blocks having abutment faces defining a polygonal outline with side faces;
• a flange member extending transversely to the axis and having an opening, the flange member being spaced axially from nut member in the unengaged state;
• and
• tabs connecting the flange member to the nut member, each tab extending alongside an abutment face on a side face and having a first end connected to the nut member and a second end connected to the flange member;
• wherein, when the attachment device in the unengaged state is inserted into a hole in a plate to be fastened, with the flange member abutting the plate at one side of the hole and the nut member extending through the hole, the abutment faces oppose an inner wall of the hole, thereby preventing rotation of the attachment device when a threaded fastener inserted into the bore of the nut member is tightened to change the attachment device from the unengaged state to the engaged state while the attachment device is in the hole,
• wherein the nut member comprises four blocks and the polygonal outline is a square outline.

An attachment device changeable between an unengaged state and an engaged state, comprising:

• a nut member extending along an axis and having an axial thread-engaging bore, wherein the nut member comprises blocks, the blocks having abutment faces defining a polygonal outline with side faces;
• a flange member extending transversely to the axis and having an opening, the flange member being spaced axially from nut member in the unengaged state;
• and
• tabs connecting the flange member to the nut member, each tab extending alongside an abutment face on a side face and having a first end connected to the nut member and a second end connected to the flange member;
• wherein, when the attachment device in the unengaged state is inserted into a hole in a plate to be fastened, with the flange member abutting the plate at one side of the hole and the nut member extending through the hole, the abutment faces oppose an inner wall of the hole, thereby preventing rotation of the attachment device when a threaded fastener inserted into the bore of the nut member is tightened to change the attachment device from the unengaged state to the engaged state while the attachment device is in the hole,
• wherein one block and one tab are located along each side face of the polygonal outline.