5/16" Grease fitting question

[Furu]

I have a grease fitting on my equipment trailer tongue jack that broke off several months back. None of my standard fittings fit it and I determined the thread was 5/16"-24 which is not a normal fitting it seems. I found a couple of stores that said they could order me a fitting but the cost would be $8 to $9 a fitting. Thinking that was a bit steep I continued to look. Last week when I was down near Sacramento I went into TSC (we don't have them up here) and there was a Speeco 5/16" grease fitting. I bought the bag of four fittings. I tried them tonight and even though they are 5/16" according to the bag they do not fit.
Does anyone have knowledge of 5/16" grease fittings that can educate me on a solution?

 

[CowboyRon]

I have a grease fitting on my equipment trailer tongue jack that broke off several months back. None of my standard fittings fit it and I determined the thread was 5/16"-24 which is not a normal fitting it seems. I found a couple of stores that said they could order me a fitting but the cost would be $8 to $9 a fitting. Thinking that was a bit steep I continued to look. Last week when I was down near Sacramento I went into TSC (we don't have them up here) and there was a Speeco 5/16" grease fitting. I bought the bag of four fittings. I tried them tonight and even though they are 5/16" according to the bag they do not fit.
Does anyone have knowledge of 5/16" grease fittings that can educate me on a solution?

Try tapping some new threads, and use a different grease zert.

 

[Furu]

Thought about that option but all the normal fittings are smaller than the existing threaded hole. I would have to find a much larger grease zerk than I currently know of.

 

[David_Kb7uns]

I picked up both the SAE and Metric grease fitting assortments at Harbor Freight and they have most of the thread sizes that you will come across.

David Kb7uns

 

[Furu]

I picked up both the SAE and Metric grease fitting assortments at Harbor Freight and they have most of the thread sizes that you will come across.

David Kb7uns

That was what I thought two years ago and since then I have found several sizes that are not included in that assortment. I have both.

 

[mrmikey]

Thought about that option but all the normal fittings are smaller than the existing threaded hole

You could go with a 1/8" npt grease fitting which takes a 'Q' size drill (0.332) which is a tad under 11/32....Mike

 

[Furu]

You could go with a 1/8" npt grease fitting which takes a 'Q' size drill (0.332) which is a tad under 11/32....Mike

That is what I thought was the answer but it means I have to buy a 1/8"NPT tap. Mine are all straight thread taps and dies.

 

[Soundguy]

good excuse for tools!

other option could be to plug and redrill for a standard 1/4 zerk.

5/16/24 plugs / set screw could be used, then redrill a new hole.. etc...

soundguy

 

[number two]

Edelmann offers a 5/16 x 24 straight grease fitting part #623000 through Carquest or others.Good Luck!

 

[brucew44guns]

I welded a zerk on once, when I was desperate to get it greasable.