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Good morning folks,
Yes, those cross-shaft bolts are 2"X 1/4-20 grade 8 hex-head bolts. For added protect against corrosion or rusting, you can buy them zinc coated. The nuts are the nylok type.
This means the bolts are 2 inches long from the bottom of the head to the tip of the threads. The shoulder is 1 inch long, the threaded length is also 1 inch and the diameter is 1/4 of an inch. There will be 20 turns or threads on that 1" section of the bolt.
The shoulder of the bolt is the strongest portion of the bolt. At one end of the cross-shaft, the shoulder will just pass thru to the other side of the cross-shaft with the nut barely tightening to the surface of the square tube. At the other end, the nut will tighten against the shoulder of the bolt without touching the tube surface. That's OK because it still won't come loose. In-other-words, the nut is going to be approxiamately 1/4" away from the side of the square tube.
Any more questions, you all know where I am.
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