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)

Child Classifications

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• F16B 39/01 specially adapted to prevent loosening at extreme temperatures
• F16B 39/02 in which the locking takes place after screwing down (F16B39/01 takes precedence; split-pins, circlips, or the like for preventing relative axial movement only F16B21/10; fastening nuts by welding or riveting F16B37/06)
• F16B 39/22 in which the locking takes place during screwing down or tightening (F16B39/01 takes precedence)