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Old 02-07-2021, 03:54 PM   #1
Rustynutz52
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Default Grease fitting size for 1937 ford spindles

What is the correct size grease fitting for 1937 ford spindles.
Thanks Mike
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Old 02-07-2021, 10:41 PM   #2
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Default Re: Grease fitting size for 1937 ford spindles

I would thing 1/4-28 thread size
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Old 02-08-2021, 06:56 AM   #3
Mart
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Default Re: Grease fitting size for 1937 ford spindles

I can confirm 1/4 - 28 (UNF)
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Old 02-08-2021, 08:25 AM   #4
Kurt in NJ
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Default Re: Grease fitting size for 1937 ford spindles

according to the parts book it is 1/8 pipe thread
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Old 02-08-2021, 08:42 AM   #5
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Default Re: Grease fitting size for 1937 ford spindles

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Originally Posted by Kurt in NJ View Post
according to the parts book it is 1/8 pipe thread

1/4-28 I just got some for my spindles.
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Old 02-08-2021, 08:58 AM   #6
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Default Re: Grease fitting size for 1937 ford spindles

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Here's a picture of some round-back spindles I had where you can see they are 1/4-28.
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Old 02-08-2021, 09:20 AM   #7
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Default Re: Grease fitting size for 1937 ford spindles

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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Old 02-08-2021, 09:41 AM   #8
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Default Re: Grease fitting size for 1937 ford spindles

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
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Old 02-08-2021, 03:24 PM   #9
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Default Re: Grease fitting size for 1937 ford spindles

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Originally Posted by DavidG View Post
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.
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
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Old 02-08-2021, 03:33 PM   #10
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Default Re: Grease fitting size for 1937 ford spindles

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Originally Posted by 35fordtn View Post
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
1/8 pipe is not 1/4-27, it is about .400-27 which is .150 larger than 1/4".
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Old 02-08-2021, 03:35 PM   #11
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Default Re: Grease fitting size for 1937 ford spindles

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.
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Old 02-08-2021, 04:26 PM   #12
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Default Re: Grease fitting size for 1937 ford spindles

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Originally Posted by bbrocksr View Post
1/8 pipe is not 1/4-27, it is about .400-27 which is .150 larger than 1/4".
Bill
You are correct..Sorry... However in the Ford 28-38 catalog it does state 1/8" pipe for 1932-34 and 1937-38
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Old 02-08-2021, 04:53 PM   #13
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Default Re: Grease fitting size for 1937 ford spindles

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
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Old 02-08-2021, 06:02 PM   #14
Jim in Wisconsin
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Default Re: Grease fitting size for 1937 ford spindles

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.
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Old 02-08-2021, 07:20 PM   #15
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Default Re: Grease fitting size for 1937 ford spindles

My bad, I guess I was thinking of the '32-'34 fittings which are 1/8" pipe threads.
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Old 02-08-2021, 07:29 PM   #16
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Default Re: Grease fitting size for 1937 ford spindles

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!!
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Old 02-09-2021, 10:04 AM   #17
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Default Re: Grease fitting size for 1937 ford spindles

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.

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Old 02-09-2021, 10:49 AM   #18
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Default Re: Grease fitting size for 1937 ford spindles

I have found nothing but 1/8" NPT on each and every 39-40 spindle I have ever worked with.
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Old 02-09-2021, 04:33 PM   #19
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Default Re: Grease fitting size for 1937 ford spindles

Quote:
Originally Posted by Kube View Post
I have found nothing but 1/8" NPT on each and every 39-40 spindle I have ever worked with.



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
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Old 02-09-2021, 05:47 PM   #20
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Default Re: Grease fitting size for 1937 ford spindles

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