Join Date: Jan 2011
Thanked 29 Times in 29 Posts
Rep Power: 5
Re: Aluminum screws instead of stainless
Aluminum screws should actually work fine. 6061-T6 has a min yield of 35ksi compared to 316 stainless steel with a yield of 45ksi. That means that a 3/8" machine screw of 6061-T6 will handle 3864 pounds before deforming permanently where the stainless can go to 4968 pounds. Yes, there is a difference, but is the aluminum screw already overkill? That's something that you'd have to decide. Is the decrease in strength worth the decrease corrosion? But . . . have you pulled any two aluminum components apart lately? I pulled my gooseneck out of the boom and found gobs of corrosion inside. Quite frankly, regardless of the numbers, stainless is still probably the best answer. New technologies aside, sometimes the old ways are the best ways, tried and true.