I use to buy my T-parts at Snyder's but this time it went wrong with the set # T-2710-AS.
The thread on the (brass)oilers does not fit in the thread on the head of the spindle bolt. It seems that Snyder's can not help me this time !
I live in Belgium and I am not familiar with the US thread sizes. Is there anyone who can help me ?
Take a look at this thread from 2007 on spindle bolts.
E-mail Snyders and see what they think is the problem and how to correct it.
I think the oilers are 1/8" National Pipe Tapered thread for 1909-1916 twist type oilers. For 1917-1927 they used the flip top oilers and I think they are just a push fit, no threads.
Hello Thomas, the problem is indeed what Bob Stoeckley described already in 2007.The pipe thread oilers don't even screw in 1/4 turn before the thread binds.And I need this brass ones, my T is a 1915. I reported this problem at Snyder's, and they wrote me that all the threaded oilers they have do fit perfectly in the spindle bolts...I live in Belgium, far away, and I am sure they know the problem, but they don"t want to correct it. Tom Jordan let me know that I had to buy a 1/8" tap for trying to change the thread in the spindle bolt, so he knows the problem! Not very helpful. Since last week I know that it must be a NPT tap and now you tell me that it must be a tapered one. That was my last question, yesterday at Snyder's, but they don't answer anymore...I told you before, I live in Belgium and all the thread sizes here are metric. Finding a 1/8" tapered NPT tap is very difficult and Snyder's does not want to sell or send me one !
You may not be able to tap material from the hole in the spindle bolt anyway... It is too hard.
I would suggest modifying the threads on the brass oilers to fit the spindle bolts.
Or, if you can get one or two turns of the thread to engage, then take them to your local jeweler and have the oilers soldered to the splindle bolts with a very small spot of silver solder.
There are US several pipe threads. I am familiar with NPT,NPSI, and NPTF to name a few. The NPSI is a straight thread and the NPT and NPTF are tapered. The T does not mean thread, it indicates taper. If you use a straight internal thread, the tapered fitting will enter it and tighten until the threads interfere and you won't see any problems with sealing.
So for this application, any tap of the correct size whether tapered or straight should work.
I have noticed this problem with the oilers and always assumed it was because the spindle bolts are hardened after they are tapped.
I have the same issue with the spindle bolt from Langs I purchased this summer. Most likely I will lightly sand down the threads on the brass oilers to make them go in farther, then use some loctite.
I believe 6 mm by 1 mm pitch taper thread is very close to 1/4 NPT. This thread is used for modern metric grease fittings. The spindle is hard and cannot be tapped, but the threads on the oilers can be re threaded. You should be able to find a 6 x 1 die in Belgium.
Might be the 10 X 1 size that is close. Look at metric grease fittings.
More on National Pipe Tapered thread sizes may be found at Engineering Toolbox
I think it's 1/8"-27 NPT. That's over 3/8" OD. 1/4" NPT is over 1/2" OD. Keep in mind that pipe is sized by the nominal ID. The threads on the OD are much larger.
6mm is close to 1/4" for sure but that is standard thread and bares no equivalent to pipe thread. I just re-tapped some wing nuts this morning with 6mm x 1.0. The wing nuts were originally 1/4-20 and it worked ok. (I needed wing nuts for a Ford Escort air cleaner.)
I have Randall Andersons spindle bolts in both of my '13s. They are made correctly, and the oilers screw right in. If you have an early T, I recommend them.
What did you remove and is it possible to get the old items thread checked? Some times just holding the old & new parts and laying one thread against the other (like a thread gauge) can show a difference. The few I've done were apparently the 1/8-27 npt mentioned so no problems. A dumb question: I assume the holes are clean and not caked with old, dry, concrete hard grease. That'll stop you cold too. though you may not be able to re-tap your bolts a 1/8-27 npt bottoming tap may clear dirty or disturbed threads.
Charlie, I removed nothing yet ! What I'm talking about is a brand new set of spindle bolts and threaded twist type oilers #T-2710-AS I bought at Snyder's. Actually, on my '15 T are the later flip top oilers (pressed in) and I wanted to change them together with the spindle bolt and the spindle bushing.
Sorry. Didn't know the bolts were new/uninstalled too. So basically you're back to square 1. One of the items, either the bolts or the oilers it tapped wrong or differently and their not compatable. I think, since according to others, the bolts can't be re-tapped I'd try to find out what thread size they have in them. Changing the oilers to that size appears to be your only option.
Thanks to everybody who was trying to help me!
Snyder's acknowledge the problem and sent me two new spindle bolts with the brass oilers already mounted on. Problem solved.