Demons eye nut D type M5X13 [Sunday / woodworking / shelving / female / screw holes and dowel with Carpenter /DIY products / connectivity / driving nuts]
1-thread shape's tapered circumference.
○ low insertion resistance and cracking the neji込meまsu straight without too much difficulty.
1 an independent thread and cut affect xylem to notch grooves, so don't have to worry about Returns or loosening.
1 if the collar features washer, tighten across the beams softwood or suitable.
1 for buried nuts.
1 use if you do not have relatively low strength materials to conclude, members screwed enough fastening strength.