Running threads with tap—Radius Arms

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Aug 1, 2021 | 03:20 PM

#16

ivsamhain

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From: CA

Quote:

Originally Posted by 77&79F250

Ok so we know the bolt head is 13/16, my gauge says it is a 9/16 bolt and 9/16 bolt hole. And a Harbor Freight tap/die set 1/2 NC13 tap (thread chaser) threaded right in by hand. Of course I just removed the bolt yesterday. Best is to get it started straight and just clean out the threads, you do not want to start it crooked and cut NEW threads. Liberal amount of PB Blaster or WD to wash out the crud in side, before and while cleaning with the tap.

NC is None Course, meaning the thread. So do not use a fine course tap. Now I use the HF stuff when I am cleaning out threads, but it I was to have to cut good thread in that area and any other critical tapping needed, I would definitely use WAY higher QUALITY made tools.

that would be national coarse, as opposed to national fine. In this case 9/16-12, where fine would be 18 threads per inch.

Aug 1, 2021 | 04:06 PM

#17

redroad

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From: Pa.

It is important to use a "thread chaser" in this application as opposed to a traditional tap. If you don't know the reason why give this a read ..

Aug 1, 2021 | 04:54 PM

#18

Truckerbase

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Quote:

Originally Posted by RKDxpress

You could go to the hardware store and get plumbers cleaning brush 1/2" and 3/4" for copper soldering.

Exactly. I used a .50 caliber rifle brush and pb blaster: worked good enough…

Aug 1, 2021 | 06:01 PM

#19

redroad

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From: Pa.

Quote:

Originally Posted by Truckerbase

Exactly. I used a .50 caliber rifle brush and pb blaster: worked good enough…

Well given the maximum effective range of a 50 cal. rifle is 2,000 meters I won't need my reading glasses for this job then.

Aug 1, 2021 | 06:08 PM

#20

Truckerbase

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Quote:

Originally Posted by redroad

Well given the maximum effective range of a 50 cal. rifle is 2,000 meters I won't need my reading glasses for this job then.

Yeah, I was going to use a ghost sight to get the job done; then I remembered I’m old, too….
you and me both, brother….

Aug 1, 2021 | 10:40 PM

#21

77&79F250

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Joined: Feb 2007

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From: S/W Missouri, Polk county

Quote:

Originally Posted by ivsamhain

that would be national coarse, as opposed to national fine. In this case 9/16-12, where fine would be 18 threads per inch.

I guess making a terminology correction is sort of that same as helping in the 1st place....sort of. What the hell was I drinking when I said "none course" instead of national course. And then I go and say "tap (thread chaser)" like it is one of the same.

redroad nice link, thanks.

Aug 2, 2021 | 08:24 PM

#22

ivsamhain

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From: CA

Quote:

Originally Posted by 77&79F250

I suppose it is, sort of. As, if he goes looking for a none course tap online he will not be able to find one; and of course if he goes looking for one as opposed to a fine course tap in person, they may wonder if he’s having a stroke.