Grease fitting size for 1937 ford spindles

Here's a picture of some round-back spindles I had where you can see they are 1/4-28.
 

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Kurt is correct, they are pipe threads, not 1/4-28 keeping in mind that the fitting has seal against leakage. They are so close to one another that it is easy to mistake one for the other.
 
they are Ford #353043-S7 which is 1/4-28 1/2" tall according to the Green Book, but in the 1928-38 catalog it lists 1/8" npt for 37-38 and 1/4-28 for 34-36

As David Says, they are close as 1/8" NPT is 1/4-27 so you can actually managae to install the wrong one and it'll still somewhat work
 
DavidG said:
Kurt is correct, they are pipe threads, not 1/4-28 keeping in mind that the fitting has seal against leakage. They are so close to one another that it is easy to mistake one for the other.
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I,m going to have to disagree with you 1/4-28 is .250 in diameter, 1/8 pipe is close to .400 in diameter. They are nowhere close.
1/8 pipe and 3/8-24 are the one that are close.
I just finished putting kingpins in a pair of 37 spindles and they are 1/4-28.
I have 3 more sets and they are 1/4-28.
Compare a 1/8 pipe fitting and a 1/4 bolt to see the difference.

Bill
 
35fordtn said:
they are Ford #353043-S7 which is 1/4-28 1/2" tall according to the Green Book, but in the 1928-38 catalog it lists 1/8" npt for 37-38 and 1/4-28 for 34-36

As David Says, they are close as 1/8" NPT is 1/4-27 so you can actually managae to install the wrong one and it'll still somewhat work
Click to expand...

1/8 pipe is not 1/4-27, it is about .400-27 which is .150 larger than 1/4".
Bill
 
I know my 32 spindles are 1/8 pipe but my 39s are 1/4-28. So at some point in between Ford made the change.
 
I know my 32 spindles are 1/8 pipe but my 39s are 1/4-28. So at some point in between Ford made the change

35 Fords have 1/4 28 NF grease nipples, so change must have occurred then
 
As far a a grease fitting sealing because of a taper, the 1/4-28 fitting are tapered, even though the threaded hole is not. If you look close at a 14/-28 grease fitting you can see the slight taper. They are supposed to tighten at the last thread and seal, at least seal enough so that grease doesn't squirt out.
The 1/8 pipe ones are also tapered, just like a pipe fitting would be. As others have said 1/8 pipe is much bigger than 1/4 inch.
 
Oh lord, it sounds like I need to buy both!!! I should have pulled them out before I had the axle cleaned up and painted. As always thanks, this site is awesome!!
 
I looked thru all my individual chassis parts catalogues to clarify the issue. They didn't. The 1/8" pipe grease fitting is listed as 353027-S7 and then its called 353047-AS7 and eventually 353043-S7. But it is eventually listed as being used for 33-34, 37, 38-48.

The 353034-S7 1/4" x 28 grease fitting seems to have been used on some 34 spindles and on all 35-36 spindles.

God Bless Henry and his Merry Men!!!
 
I have found nothing but 1/8" NPT on each and every 39-40 spindle I have ever worked with.
 
Kube said:
I have found nothing but 1/8" NPT on each and every 39-40 spindle I have ever worked with.
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Kube, I've got 2 sets in front of me and 1 set I just installed on the axle, all 37-41 round back spindles. All have 1/4-28 threads I just put the grease fittings in last night 1/4-28 stainless fittings.

Bill
 
1/8-27 NPTF specs, thread dia is listed as .390
 

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