In a security cover, or
system, for a
fastener both (1) a step
washer, and (2) a
hollow cylinder rotating to the contained step
washer, are affixed to a surface by a nut, or by a bolt head, that is to be protected from tampering. A (3) hollow cap fits loosely over the bolt head or nut, and is either (A) compressively forced upon the step
washer, the cap being within cylinder that is then rotatable relative to the cap, step washer and nut or bolt head; or else (B) compressively forced into the hollow of the cylinder, therein to rotate together with the cylinder relative to the step washer and nut or bolt head. The (3) hollow cap may also be fit compressively over, as opposed to within, the cylinder. No matter to which component the cap fits compressively, and whether mounted to the interior or exterior of the cylinder, the outermost structure—normally the cylinder—(A) rotates freely to the bolt head or nut contained therein, (B) is, by action of the lock washer, highly resistant to becoming compressed so as to
gain purchase on the enclosed bolt head or nut for malicious loosening and tampering, and (C) is, by its compression fit, highly resistant to removal. An optional (4) ring can be fit between the cap and the cylinder and into complimentary circumferential grooves on each. The rotating incompressible cover in three, or in four, parts provides permanent, unremovable, security to a bolt head, or a nut, from tampering.