No. You can use the same commercially available bolts (the old JIS2 class and the new JIS 6g) you use currently. When we make special bolts in-house, they are manufactured to match the nut, but a different in tolerances may result. In this case, the bolt may deviate a great deal from the JIS standard range. Be aware that this may result in the HARDLOCK NUT not fitting in or the concave and convex parts not fitting together as well.