Adjustable type open jaw wrench for butterfly nuts

Aiming at the problems that one existing butterfly nut wrench only can fasten butterfly nuts of a single specification and can not fasten butterfly nuts when the screwing-in ends of butterfly nuts are non-opened, and when a monkey wrench is adopted, butterfly nuts are prone to lateral wing deformation and root cracking, the invention discloses an adjustable type open jaw wrench for butterfly nuts. The single wrench can achieve fastening of butterfly nuts of series specifications and can also achieve fastening of butterfly nuts without opened ends. The wrench is composed of a handle and fixed chuck assembly and a movable chuck assembly. The gap for clamping the lateral wings of butterfly nuts in the two assemblies can be adjusted by a rotary knob; the interval of a jaw between the movable chuck assembly and the handle and fixed chuck assembly can also be changed by the rotary knob. The adjustable type open jaw wrench for butterfly nuts is suitable for the occasions where various butterfly nuts are fastened.