Well, let's look at the math.

7/16 = 28/64, so a larger hole drilled.

13/32 = 6.5/16

Larger hole and smaller tap. No idea what they're thinking, but that doesn't sound like a good idea. Tap will probably go right through the hole. You can find drill/tap charts online to confirm. Pretty sure that combo doesn't work.

 

I am most likely reading this wrong; I'm pretty new to this. But here's what the instructions say and the accompanying picture:

"12. If you don’t have one already, you really need to pick up a matched 7/16″ x NF20 Drill Bit and Tap Set like the one shown here.

 

Correct, that's the tap size. Corresponding drill bit is 25/64. That set they picture has been coming with the wrong size drill bit. Just double check.

 

This is the size I used, worked perfect.

 

Where did you get that set? I'm going to be putting these on soon and need to get all the tools lined up for a smooth install.

 

I got mine from Lowe's

 

Fastenal.

 

I have the 7/16 20 Tap on order. Is this the wrench I need?

Klein Tools 68310, 5 1/2-Inch Ratcheting Refrigeration Wrench - - Amazon.com

I'm probably going to buy that if its the right one. Also I'm thinking about just Drilling tapping and bolting like 2 on each side. Just to get it on then weld the rest. If I ever need to get them off I can just cut them off. Maybe I'm just lazy but Drilling and tapping 14 holes does not seem like a fun time. I'll have to see how the first holes go then decide if I want to do the rest.

 

That Klein is correct. Yellow Jacket or Ritchie make them as well.

 

I think once you drill and tap the first couple of holes you will see it is not that bad. I worried more than I should have and it ended up going smooth as silk. Just use cutting fluid when threading and you will be fine. Good luck with the install.