I'm cleaning up my grandpa's old bottle jack. The plunger (first pic) seal was completely deteriorated and I'm not completely certain the type of replacement seal I need. I have seen similar plungers with what looks like several o-rings, washers, etc stacked. But I am not sure that is what I am looking for.

Does anyone know what type of seal I am looking for?

Unfortunately, I do not know tonnage capacity, brand, etc.
Plunger specs:
OD 12mm
ID 5.7mm

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Posted by Unobtanium

Baton Rouge

Member since Nov 2009

1899 posts

Posted on 2/20/26 at 6:12 pm to bmela12

Try these folks - Lazzar's

They fixed me up on an old Craftsman floor jack years ago.

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Posted by Clames

Member since Oct 2010

19377 posts

Posted on 2/20/26 at 6:15 pm to bmela12

Probably a cup seal for the tip of the plunger and a dust seal around the shaft. Lots of places carry seal rebuild kits, may just have to call around and give them those measurements.

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Posted by bmela12

Baton Rouge

Member since Mar 2009

431 posts

Posted on 2/20/26 at 6:43 pm to Unobtanium

quote:
Unobtanium

I played around on the site and I think a U Cup seal may be my answer.

U-Cup Seal

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Posted by Tree_Fall

Member since Mar 2021

1207 posts

Posted on 2/20/26 at 9:03 pm to bmela12

Don't believe everything AI tells you...Great West bottle jack 1940-1960. Sold through auto, farm, etc shops. Might accept Simplex parts with kits on Ebay...LINK

Note that bag of seals is $60.

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Posted by Spankum

Miss-sippi

Member since Jan 2007

61673 posts

Posted on 2/23/26 at 2:12 pm to Tree_Fall