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Old 02-22-2007, 08:30 AM   #1 (permalink)
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Tap and Die question

Two questions when looking for tap and die sets.

What does the "NC" and "NF" mean

And where can I find a single 7/8's LH tap and a 7/8's RH tap?
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Old 02-22-2007, 08:40 AM   #2 (permalink)
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NC= SAE standard, or coarse thread pitch
NF= SAE fine thread pitch

There are also some intermediate thread pitches found in larger sizes, but they are pretty uncommon outside manufacturing facilities.

Off the top of my head, places that should have left and right taps, Graingers, Mcmaster carr, Fastenal, Most industrial tool and die supplies, or industrial fastener supplies.

You may want to try searching google for more info. You can find most of the above info, as well as the actual TPI for the different thread pitches according to bolt size.

Later,
Jason
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Old 02-22-2007, 09:08 AM   #3 (permalink)
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Quote:
Originally Posted by Trogdor View Post
where can I find a single 7/8's LH tap and a 7/8's RH tap?
e-taps.com
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Old 02-22-2007, 09:40 AM   #4 (permalink)
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Does this sound right for a 7/8 tap in a 1.25 DOM with a .25 wall? I'm trying to make a tie rod and drag link with 7/8 TRE's.


for 7/8"-18 thread hole size is .828
for 7/8"-9 thread hole size is .766


Also what does the last number mean on the sizes?
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Old 02-22-2007, 09:57 AM   #5 (permalink)
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The last number in the tap sizes is the TPI's or threads per inch.
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Old 02-22-2007, 10:14 AM   #6 (permalink)
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Thanks guys. one last question.

What do these types mean?
Taper
Plug
Bottoming?

I think I understand the Taper one to be self centering, am I correct in the assumption?
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Old 02-22-2007, 10:18 AM   #7 (permalink)
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Actually nevermind....Google rawks lol
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Old 02-22-2007, 03:22 PM   #8 (permalink)
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Quote:
Originally Posted by Trogdor View Post
Does this sound right for a 7/8 tap in a 1.25 DOM with a .25 wall? I'm trying to make a tie rod and drag link with 7/8 TRE's.
for 7/8"-18 thread hole size is .828
for 7/8"-9 thread hole size is .766
7/8-18 UNS tap drill size is .815-.828

7/8-9 UNC tap drill size is .755-.778
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Last edited by krb; 02-22-2007 at 03:27 PM.
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Old 02-23-2007, 09:44 PM   #9 (permalink)
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Be aware that you've got one fine-thread tap, and one coarse-thread tap, listed there. (That's the -9 and -18 thing)...

The tie rod ends I assume you're going to be needing these taps for? They'll most likely both be fine-thread. Fine or coarse, either way you'd still have one useless tap.
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Old 02-23-2007, 10:31 PM   #10 (permalink)
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and if your going to make tie-rod ends fit into a knuckle you might need to get a tapered reamer also..if your making the hi-steer brackets.just a fyi
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Old 02-25-2007, 02:58 PM   #11 (permalink)
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Tie rod end would probably be 7/8" x 18. The Chevy 1/2 ton TREs I used on my Jeep were anyhow.
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