Locking exclusively by special shape of the screw-thread

Full Title

Locking of screws, bolts or nuts (; locking of bottle closures B65D; locking of rail-fastening bolts for permanent ways E01B9/12; locking of fastening means for railway fishplates E01B11/38; locking devices for valves or cocks F16K) > in which the locking takes place during screwing down or tightening (F16B39/01 takes precedence) > by special members on, or shape of, the nut or bolt (F16B39/26 takes precedence; locknuts F16B39/12) > Locking exclusively by special shape of the screw-thread