Yes, the tread is 1 inch thick.
1 and 1/16th is the actual thickness
The treads are right at 60" so you would loose the blade width with your cut. The oak treads are full 1" thick, but I imagine that local building codes would dictate whether you could use just two stringers. I don't have any wood tables that show the deflection versus load over 30".
Yes, all my treads were solid edge glued red oak. I ripped some of them and glued them onto other tread pieces to make them into 24" deep shelves.
unfortunately no. 11.5 is the widest size available.
We do offer a 72" Red Oak tread through the Home Depot Store's special order program. We have them in stock and they would ship right away. If you need help please let us know. Thank you Stairtek Customer Service
Belated thank you for the fast shipping. We ordered the Stairtek oak box tread to use as a hefty shelf, and it was straight, true, and without flaws or nicks. It didn't even need sanding before we stained it black. Would definitely order more.
The unfinished stair treads have no chemicals applied to them; they are "raw" wood. You make the decision either stain them and then apply a polyurethane finish, or leave them unfinished.
They are for replacement.