I recently added Rokblokz mudflaps to my 2023 Bronco Black Diamond. I like how they mount, but they do not provide long enough screws to properly assemble the front flaps. Rokblok has added a metal plate to stiffen the assembly on the front plates, but did not update the screw lengths to accommodate the thicker stack of material. The provided 1/2" long 10-24 barely engage one thread on the holes which go through the metal stiffening plate. I ordered 9/16" 10-24 screws to assemble these properly, and this fit well. I made Rokblokz aware of this problem and their response was: "Thanks...but we know what we are doing." Not a great response, especially given the cost. Good engineering practice we teach at Caltech is that screws should engage 1.5 screw diameter. For a #10 screw, (0.190" dia.), this means the screw should thread in 0.285", which is 7 turns.
I had a similar encounter as you did with the regular rally style flaps from them, felt like thread engagement was barely there. Never had them on long enough to see if they would hold up or not before changing to their step back style due to tire rubbing.
I recently added Rokblokz mudflaps to my 2023 Bronco Black Diamond. I like how they mount, but they do not provide long enough screws to properly assemble the front flaps. Rokblok has added a metal plate to stiffen the assembly on the front plates, but did not update the screw lengths to accommodate the thicker stack of material. The provided 1/2" long 10-24 barely engage one thread on the holes which go through the metal stiffening plate. I ordered 9/16" 10-24 screws to assemble these properly, and this fit well. I made Rokblokz aware of this problem and their response was: "Thanks...but we know what we are doing." Not a great response, especially given the cost.
Good engineering practice we teach at Caltech is that screws should engage 1.5 screw diameter. For a #10 screw, (0.190" dia.), this means the screw should thread in 0.285", which is 7 turns.
I had a similar encounter as you did with the regular rally style flaps from them, felt like thread engagement was barely there. Never had them on long enough to see if they would hold up or not before changing to their step back style due to tire rubbing.
Ok… thanks the reply. Rokblokz insisted that with thread locker it will be fine 🧐
For the love of god (and $450) just provide the correct screws.