8.8级细幼右旋牙扣外六角螺母帽

GB61718.8级发黑六角锁紧细牙螺母螺帽M52*4M56*4M60*4M64*4M68*4

GB61718.8级细幼右旋牙外六角螺母帽M39M42M48M52M56M64M68M80*3

8.8级发黑六角锁紧细牙螺母螺帽

。61718.8级细扣六角螺母/螺帽高强度细牙螺母M40*1.540*240*3

GB61718.8级细幼右旋牙外螺母六角帽M39M42M48M52M56M64M68M80新

GB61718.8级细幼右旋螺母外六角牙帽M39M42M48M52M56M64M68M80*3