Drill size for 11/16 NF tap

Hey Machinists, what size drill bit to use for 11/16 NF tap for Ford tie rod ends? Cant find it in any of my publications.
Thanx, Dave

 

pretty sure those are fine thread so a 3/4-16 tap is what you need

 

5/8"

 

9/16 is 33/64 and 5/8 is 37/64

<TABLE cellSpacing=0 cellPadding=2 width=591 border=1><TBODY><TR><TD align=middle width=97 height=16>

9/16-18​

</TD><TD align=middle width=76 height=16>UNF</TD><TD align=middle width=109 height=16>

18​

</TD><TD align=middle width=160 height=16>

.5625​

</TD><TD align=middle width=100 height=16>.5264</TD><TD align=middle width=125 height=16>.4943</TD><TD align=middle width=89 height=16>.5024</TD><TD align=middle width=82 height=16>

33/64​

</TD></TR><TR><TD align=middle width=97 height=16>

5/8-11​

</TD><TD align=middle width=76 height=16>UNC</TD><TD align=middle width=109 height=16>

11​

</TD><TD align=middle width=160 height=16>

.6250​

</TD><TD align=middle width=100 height=16>.5660</TD><TD align=middle width=125 height=16>.5135</TD><TD align=middle width=89 height=16>.5266</TD><TD align=middle width=82 height=16>

17/32​

</TD></TR><TR><TD align=middle width=97 height=16>

5/8-18​

</TD><TD align=middle width=76 height=16>UNF</TD><TD align=middle width=109 height=16>

18​

</TD><TD align=middle width=160 height=16>

.6250​

</TD><TD align=middle width=100 height=16>.5869</TD><TD align=middle width=125 height=16>.5568</TD><TD align=middle width=89 height=16>.5649</TD><TD align=middle width=82 height=16>

37/64​

</TD></TR></TBODY></TABLE>

Splitting the difference gives us 34/64 = 17/32
Splitting the difference between the math there gives 5/8 drill size.

 

http://www.physics.ncsu.edu/pearl/Tap_Drill_Chart.html

 

5/8" drill bit for 11/16-18 threads

 

11/16 24 thread use a 41/64 for Alum. brass and plastic. Use a 21/32 for steel, stainless and iron.

 

I use 5/8". I think 21/32" is "correct" but almost impossible to find and (very) expensive when you do. I have the left and right "Speedway" taps and find 5/8" produces a good result.

 

I remember when I made my tie rod and drag links out of DOM tubing, and used those left and right hand taps from Speedway, that I had a hard time holding that super smooth tubing still while the tap was getting in there real deep. It's hard to get a grip on that smooth DOM. I was using a collet in a huge lathe at work and it just kept sliding. So I drilled out some large nuts that were about 1-1/16 across the flats and slipped them over the DOM and welded them on, then it was easy to get a grip, and the hex nuts really came in handy later on doing alignment adjustments and stuff later on. I welded the nuts on further down the tubing beyond the threaded area so that the heat of the welding wouldn't distort the threads or weaken the steel in the thinned down wall of the threaded area.

 

to figure any tap drill size, ex. 11/16-18 you need the pitch diameter , take 1 divided by 18 =.0555 subtract this number from the 11/16 ex. .6875-.0555= .632 the closest drill is a (16.00 mm =.6299)or a (5/8=.625) .21/32 or 41/64 are too large. use a good tapping fluid one with a high ash content.

 

Okay what is a good source for a 11/16 Die????

 

Check with MSC.

(Manhattan Supply Company.)

They have a lot of stuff, their catalog runs over 1000 pages.

As an example, my couple years old catalog has 41 pages of drills alone.

 

https://www.pts-tools.com

 

Yep its 11/16 24 . Been messing with the same thing. Cant find a die.

 

did you guys check mcmaster carr for the die and drill bits? They have most everything

www.mcmaster.com

can I borrow your tap when your done? ha ha

 

I think you should invest in a threads per inch gauge,early ford tie rods and drag links are 11/16-18

 

The tie rod end is NOT 24 thread. It's 18 threads per inch. The 5/8" diameter drill IS the correct one. Why do need a die? To clean up threads on the tie rod end itself? The tap is available from Speedway-both left and right hand. You'll probably play hell trying to find the left hand anywhere else.

 

I use 50's and early 60's ford rod ends and they are 11/16 24 thread.

 

Thanx HAMBrs, got my info and McMaster Carr has the bits in their catalog.

 

If you need a die just to clean up threads, i've always used my thread file on the bigger or oddball stuff , it's saved my ass a bunch of times. I think from Snap-on it was like 20-25 bucks.

 

Okay ther seems to be alittle confusion on knowing your drag links etc. 28-34 used a different size then the later brothers. These used a female in and screwed over a tapped tube while the laters used the commonly Speedway style tie rod end. So if you got a thread gauge and you are measuring correclty then maybe you need to attend a class on how to measure the gauge.. Heres some pics for comparrison.






You can plainly see in this pic that they are totally different threads one is fine and one is very fine.

 

Thank you , thank you, thank you !!!! Now if the right people read it .. And I do have a thread gauge .

 

I worked in job shops for 30 yrs, What Fenders is dead on the money. Divide 1 by pitch ( no. of threads), subtract that from basic o.d. (11/16= .6875) that gives you .632. 5/8=.625, bingo.

 

Where do you get that ? We are talking about the top one , the fine thread the 11/16 24 .. Neither one is 5/8 ..

 

5/8 is the tap drill size, thats what were talking about right?

 

Dirty2,
Now I got you,read a earlier post and thought you were asking tap drill for 11/16 18 tpi., tap drill for that is .632, close enough to 5/8 (.625.). For 11/16 24 use 41/64 tap drill. 1 divided by 24 (tpi) = .04166 minus (11/16) .6875, =.6458. 41/64 drill is .6406, close enough.

 

This posting clarified the whole thing. I never thought about anything other than the "Usual/normal" tie rod end which is 11/16-18. However, Machinery's Handbook lists 11/16-24 as "NEF" or "National EXTRA Fine" (which I had never heard of.). But, on the other hand, Machinery's Handook does NOT list 11/16-18 as N.F. either-in fact they don't list 11/16 dia in any of the other thread charts.






quote=Dirty31;2572622]Okay ther seems to be alittle confusion on knowing your drag links etc. 28-34 used a different size then the later brothers. These used a female in and screwed over a tapped tube while the laters used the commonly Speedway style tie rod end. So if you got a thread gauge and you are measuring correclty then maybe you need to attend a class on how to measure the gauge.. Heres some pics for comparrison.






You can plainly see in this pic that they are totally different threads one is fine and one is very fine.
[/quote]

 

We kinda got off the original post. what fenders and Dale Fairfax said that a 32 drag link was 5/8 18 and we (me and Dirty31) have been working on that and it is 11/16 24 . so Dirty31 posted some picts to show the differance. what fenders even commented that I need to get a thread gauge which I have . Oh well there are people that help and there are people that wont to find fault . Thanks thirty7slammed for helping with the drill size. I was needing a 11/16 24 die , but we got it repaired . We was dealing with an orig 32 tie rod .

 

Wholesale Too lin Warren, MI has an 11/16-24 die for $11.50 in their latest sale flyer. www.wttool.com. Stock number 0504-0585

 

Thanks for the link .
Danny