A702 Hub Spoke Tap

[Wayne]

Would that be the same size as Aemotor used on some of there towers. I had an Aermotor tower once and the bolts were larger than 3/8. They also had a sloted head.

[windybob]

Wayne, I throw those as far as I can.

[pcowley (RIP)]

Windybob, correct me if I am incorrect.
Aermotor threaded all bolts with standard thread and then galvanized all the bolts.That is the reason that a standard nut will not fit them.They used the same tap for the hub that they used for the nut because the spokes were threaded before galvanizing thus a larger diameter tap is required for the hub and nuts. Standard bolts are loose in both the nuts and the hubs. I have been told that the tap is a English thread.All I know for sure is that 6 foot tail sheet nuts will fit the outer thread on ether a 6 or 8 foot spoke.

[windybob]

Paul, I don't really know about that. I think they are true 32nd sizes, because threads that are not galvanized are also off kilter. Don't know about an English thread. Metrics are pretty close though. I have some metric taps I use for hub threads. But don't tell anyone. It's not kosher.

[Wayne]

SHHH. What was amazing about the sloted head bolts they all came apart easely. Not only did Aermotor get the blades right who ever mixed their galvanizing got it right.

[pcowley (RIP)]

Wayne, They made a special slotted screw driver to use with those slotted screws that are in the old Aermotor towers. Bryon or Mark Welch in FtWorth might have a picture of one.

[Wayne]

Thanks for the info Paul. I wonder why slotted bolts when every one else was using regular bolts. Maybe figured we could use them then make a tool we could sell with the windmill extra bucks.