HenryKrinkle
NAXJA Forum User
- Location
- WI
I'm trying to find the right hardware for mounting rock rails into the frame rails. So far I know they need to be 3/8x about 1 1/2" and "self - threading". There are about 3 types of self-threading screws I've found. I'd like to get the strongest mount possible. Here's what I've found:
1 Thread-Cutting: Cuts its own threads. For thicker material. Weaker threads. Hardware not graded.
2 Thread-Rolling/Thread-Forming: Displaces material into thread. For thinner, less brittle material. Stronger hold, can remove and install without damage. Hardware not graded.
3 Drilling and tapping: I could pre-drill and then tap the hole to use a grade-8 screw. Little more expensive, but would likely be the strongest option. Depending on the thickness of the frame rails I'd either cut or form the threads with the appropriate tap.
So, who has seen how thick this material is? Would you consider it soft, hard, brittle, malleable, etc?
I'd like to roll/form the threads for strength- anyone think they'd need to be cut in instead?
Thanks...
1 Thread-Cutting: Cuts its own threads. For thicker material. Weaker threads. Hardware not graded.
2 Thread-Rolling/Thread-Forming: Displaces material into thread. For thinner, less brittle material. Stronger hold, can remove and install without damage. Hardware not graded.
3 Drilling and tapping: I could pre-drill and then tap the hole to use a grade-8 screw. Little more expensive, but would likely be the strongest option. Depending on the thickness of the frame rails I'd either cut or form the threads with the appropriate tap.
So, who has seen how thick this material is? Would you consider it soft, hard, brittle, malleable, etc?
I'd like to roll/form the threads for strength- anyone think they'd need to be cut in instead?
Thanks...