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Ken in Texas 
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Joined: 11 Sep 2009
Location: Henderson, TX
Points: 5919
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 Topic: U joint grease fittings
Posted: 07 Dec 2019 at 5:49pm |
NOT 1/8th or 1/4 NPT. Somewhere in between . Need 2 to be able to keep my Brush Hog Drive Shaft U joints Greased. Replaced yoke using same old cross and cups. Old yoke was not for a 1 3/8" 6 spline gearbox output shaft. Noted the grease fittings were both missing. TSC had what I needed. Broke the Bank to take the right yoke home. I thought I had a good selection of Grease Fittings until nothing I have threads into these old crosses . Is there such a thing as a 3/16 Grease Fitting?
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ACinSC
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Joined: 16 Dec 2015
Location: South Carolina
Points: 2904
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Posted: 07 Dec 2019 at 6:26pm |
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Could they be metric ?
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DiyDave
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Joined: 11 Sep 2009
Location: Gambrills, MD
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Posted: 07 Dec 2019 at 6:34pm |
Drill them out, to the next biggest size you have, and tap them to that size... 
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
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Posted: 07 Dec 2019 at 7:55pm |
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the smaller one is a 1/4 inch bolt thread... the larger one is 1/8 inch pipe... never seen one in between.
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Like them all, but love the "B"s.
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shameless dude
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Joined: 10 Apr 2017
Location: east NE
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Posted: 07 Dec 2019 at 9:49pm |
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might be the "push in" type. found that on a new mower I have, one dropped out and the hole wasn't threaded, and the dealer told me they were the push/pound in type. I got some and ruined one when I pounded it in. found a really small metal tube and pounded on that after placing the zerk up inside it.
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Ken in Texas
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Joined: 11 Sep 2009
Location: Henderson, TX
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Posted: 08 Dec 2019 at 6:09pm |
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You got it Backwards Steve The small zerks in my assortment are 1/8 NPT the bigger are 1/4 NPT. Went online and found 3/16 grease zerks . All shapes , straight , 45 and 90s . Problem is 3/16 WHAT?
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Ken in Texas
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Joined: 11 Sep 2009
Location: Henderson, TX
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Posted: 08 Dec 2019 at 6:12pm |
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You got it Backwards Steve The small zerks in my assortment are 1/8 NPT the bigger are 1/4 NPT. Went online and found 3/16 grease zerks . All shapes , straight , 45 and 90s . Problem is 3/16 WHAT? All I know is a 1/8 is to small and a 1/4 is to big
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DiyDave
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Posted: 08 Dec 2019 at 6:29pm |
 Ken in Texas wrote:
You got it Backwards Steve The small zerks in my assortment are 1/8 NPT the bigger are 1/4 NPT. Went online and found 3/16 grease zerks . All shapes , straight , 45 and 90s . Problem is 3/16 WHAT? All I know is a 1/8 is to small and a 1/4 is to big |
He might have mis read. Size wise, 1/4" x28 tpi bolt thread are the smallest. Check hole with a 7/32 drill bit. If hole is bigger, use a 21/64 drill bit and check if that's it, then its a 1/8 pipe thread... Never heard of a 3/16 bolt or pipe thread.
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Ray54
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Joined: 22 Nov 2009
Location: Paso Robles, Ca
Points: 4660
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Posted: 08 Dec 2019 at 7:52pm |
They do make metric.You got it at TSC ? Made in China cheap. No matter how much they charge. Would be nice if information given and you check with drill bits it is USA thread. But if that is not looking right try metric.
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jaybmiller
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Joined: 12 Sep 2009
Location: Greensville,Ont
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Posted: 08 Dec 2019 at 8:06pm |
oods are real good they are METRIC ! I've got some 7/8" bore pillowblocks here.....Zerks ARE metric.... I assume the default nowadays is Metric. then 'soft' conversion, then Imperial. Soft means stuff that goes bothways....like 5/16<>8mm
Jay
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3 D-14s,A-C forklift, B-112
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
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Posted: 08 Dec 2019 at 8:39pm |
3/16 zerk is smaller than the 1/4 inch bolt thread size... You drill a 3/16 hole and POUND it in.. not threads, just TEETH.
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Like them all, but love the "B"s.
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steve(ill)
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Location: illinois
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Posted: 08 Dec 2019 at 8:43pm |
there are a variety of zerk threads.. the two most STANDARD are the 1/4 inch bolt thread and the 1/8 inch pipe... you can also find 1/4 inch pipe and other, but not that common.
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Like them all, but love the "B"s.
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steve(ill)
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Location: illinois
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Posted: 08 Dec 2019 at 8:52pm |
a 1/4 inch BOLT thread is .250 inch diameter - an 1/8 inch pipe is .400 inch diameter a 1/4 inch pipe is .540 inch diameter a 12 mm ( metric) zerk is .470 inch diameter. ( or about half way between the two pipes).
Edited by steve(ill) - 08 Dec 2019 at 8:55pm
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Like them all, but love the "B"s.
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