grease insert locking bolt
logical locking and electrical locking
effective diameter of bolt or high-strength bolt
Fastening Bolt， Binding Bolt
reamer bolt [= rimer bolt]
taper bolt [= tapered bolt]
[endoscopic]locking knob
2PL two-phase locking protocol
A new phase locking method with zero crossing
absolute frequency locking
active-active transient mode-locking technology