Tamper-Proof Security Nuts are usually used in applications where the head of the mating bolt or screw is not accessible. The nut is tightened with some unconventional or patented drive style that makes it tamper proof.
Security Nuts Diameters
Security Nuts are available on the FCH Network with Imperial/US diameters that range from #1 to 5 and with Metric diameters that range from M2 to M65. The length of Security Nuts is usually measured from the point to the underside of the head.