Thread size/pitch for zerk fittings? 1/4" NPT?

[Tim Ayers]

Can someone tell me the size for the zerk fittings for the trans case and pedals? I believe it's 1/4" NPT thread, but I don't have pipe thread gauges to confirm.

Thanks,

[JWL]

Most are 1/8" pipe threads. If it looks to be about 3/8" diameter it is 1/8" pipe.

[Tim Ayers]

Originally Posted by JWL

Most are 1/8" pipe threads. If it looks to be about 3/8" diameter it is 1/8" pipe.

Yes, that's it. It didn't quite fit the 3/8" size tool. Thank you!

[1948F-1Pickup]

Today the standard "common" grease fitting is
1/4-28. I fitted a few thousand of them when I
was working for a suspension manufacturer.
Don't know about our old trucks and cars.....

[rotorwrench]

It depends on year and type of vehicle. If you get a copy of the green bible, just look up the pedal part number and below it will have the lubricator fitting. In the back of the book there is a list of hardware and the different P/N 3530XX-X lubricator fittings and what size each one is.

This chassis parts catalog is a must for anything 1948 & prior.

[Tim Ayers]

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Originally Posted by rotorwrench

It depends on year and type of vehicle. If you get a copy of the green bible, just look up the pedal part number and below it will have the lubricator fitting. In the back of the book there is a list of hardware and the different P/N 3530XX-X lubricator fittings and what size each one is.

This chassis parts catalog is a must for anything 1948 & prior.

OK, will do. I have that and never thought to look in there.

[Mart]

Kingpin bosses are 1/4-28.

Most others are 1/8 NPT as said.

[drolston]

While we are on the subject of grease fittings, = why will a new grease gun not fit onto the zerk fittings on my '41? Bought another tip for the grease gun and it would not go on either. The old grease gun I have from 50 years ago goes on okay, but it does not have the flexible tube that I need to get onto some of the zerks.

[Tony, NY]

FWIW. The smallest Zerk fittings I've come across are the uncommon 1/16" pipe thread. The only application for that size thread I have ever seen.

[Kurt in NJ]

No threads, press in---- unless modified through the years

[Tim Ayers]

Originally Posted by Kurt in NJ

No threads, press in---- unless modified through the years

Hey Kurt,

For what? The zerks in the pedals and trans case most certainly have threads.

[Kurt in NJ]

I was thinking model A

[CarlG]

Originally Posted by Kurt in NJ

I was thinking model A

Model A has a mix of press in and threaded. The threaded ones are 1/8” npt.


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[40Pickup]

1/8-27 NPT, The flank angle is 60°

1/8-28 BSP, The flank angle is 55°

It's easy to mix them up, especially for us here on the other side of the pond where the BSP thread is more frequent!

Jorgen