This nut is not M6. All M6 screws (metal or nylon) will slip out. Beware before embedding in any construction or you ll have to rip the whole thing apart.Fellow HobbyKing customers read reviews before ordering this can save you disappointment when you receive items like these. I would like to urge Hobbyking to share the risk when items ordered does not conform to specifications: like on investigation into our claims, to at least refund in points half the value. The cost to return and resend is more than the values of the items. This is the first HobbyKing product that I have got a problem with. Although I have given this only 1 crown the quality is not that bad except that it is not M6 as stated. The thread on these nuts is approximately M7.
I have made a plan with these nuts by heating it with a heatgun to about 120 degrees C and squeeze it square with two sets of pliers until it cooled down. One small combination plier horisontal and a stubby long nose vertical in the gap of the other pliers. At least it will hold a light load secure.I've bought 2 packs (8 pcs total), only 3 of them can hold itself on a M6 bolt, others just slide out. Totally useless.A little bit shoddy this one. Still burrs left over from drill/tapping the bolt hole. Surprisingly this did not fit the 6mmx40mm bolt sold here on hobby king. A big disappointment for me, but I may have ordered the wrong bolt for this nut.