Breakaway Nuts
Vandlgard breakaway nuts are used when the 1" square base of the Tufnut is too broad to fit the fastening surface. In the 5/16 size, the base of the breakaway nuts is 5/8" OD.
Vandlgard sign security nuts are available in zinc, aluminum, or steel, and can be installed with regular tools, including socket wrenches.
Upon tightening, the hex head shears off, leaving the conical nut base locked into the fastening. The 5/16-18 size (all part numbers ending in "L") break off at a low torque of 40-60 inch-pounds to create a secure fastening without causing a sign face to dimple from too much pressure.
All other part numbers are for breakaway nuts with higher torque ratings designed for metal-to-metal or wood fastenings where torque is not a problem. All the break-off specs are included in the Breakaway Nut Specifications below.
Breakaway nuts can be removed, but are not re-usable once unfastened.