Why no 9/16 bolts

[m_fumich]

Sometimes in fabricating, one needs the biggest bolt possible, but cannot go 5/8, or 3/4 because the hole would weaken the structure.

That makes sense. Why they’re not more readily available is the big question to me.


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[fatfillup]

Since I said I didn't recall seeing a 9/16 bolt, I thought I would check my individual tap display and darned if don't have a slot for 9/16 fine and course taps.  I have 2 fine but no course.  Apparently I had a couple when I made up the cabinet.

[gtermini]

Sometimes in fabricating, one needs the biggest bolt possible, but cannot go 5/8, or 3/4 because the hole would weaken the structure.

That makes sense. Why they’re not more readily available is the big question to me.


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Because they're a (mostly useless) antiquated size. They don't do anything that 1/2" G8 or 5/8 won't do better. Same with #12-24, #5-40, #8-36, and all the other once common screws that have gone the way of the dodo. Finding holes near 9/16" is usually just manufactures grossly oversizing clearance holes for 1/2" bolts to account for wide open fabrication tolerances.

[slip knot]

I've got a 9/16 fine die. I seem to recall it was for u bolts or spring bolts. been in the box a long time now.

[john k]

Was at a John Deere dealer today,  size chart and the bolt bins had coarse and fine threaded bolts , nuts.

[pep]

I've got a 9/16 fine die. I seem to recall it was for u bolts or spring bolts. been in the box a long time now.

Correct, also drag link, tie rod, & hair pins, heim joint & rod ends.