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  1. Trailer Bearings Races Seals Caps
  2. Bearing Buddy
  3. Caps
  4. Bearing Protector Grease Cap
  5. 1.938 Inch
Bearing Buddy Bearing Protectors - Model 1938SS - Stainless Steel (Pair)

Bearing Buddy Bearing Protectors - Model 1938SS - Stainless Steel (Pair)

Item # BB1938SS
Our Price: $34.39
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Trailer Bearings Races Seals Caps
Shipping Weight: 1.01 lbs
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BB1938SS - Bearing Protector Grease Cap Bearing Buddy Caps
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Great for marine applications; the stainless steel construction provides the best in corrosion resistance. The design makes Bearing Buddy an easy way to protect your bearings by keeping water out and ensuring enough grease is in the hub. Great Prices for the best trailer bearings races seals caps from Bearing Buddy. Bearing Buddy Bearing Protectors - Model 1938SS - Stainless Steel (Pair) part number BB1938SS can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (25)
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Bearing Buddy Trailer Bearings Races Seals Caps - BB1938SS

  • Caps
  • Bearing Protector Grease Cap
  • 1.938 Inch
  • Bearing Buddy

Great for marine applications; the stainless steel construction provides the best in corrosion resistance. The design makes Bearing Buddy an easy way to protect your bearings by keeping water out and ensuring enough grease is in the hub.


  • Replaces the grease cap in the axle hub
  • Prevents wheel-bearing failure
    • Keeps water and dirt out of hubs and bearings
    • Allows boat trailer wheels to be completely submerged
    • Stops corrosion and pitting on bearings
  • Provides easily accessible grease fitting
    • Makes adding grease to the bearings quick and simple
  • Maintains slight, controlled pressure (3 psi) with spring-loaded piston, preventing water from entering hub
  • Prevents overfilling and rear seal damage with automatic pressure-relief feature
    • Grease seeps around piston edges and into barrel when full
  • Constructed of stainless steel
    • Ensures longer-lasting fit than plastic or aluminum products
  • Includes rubber covers
  • Installs easily
  • Made in the USA


  • Fits 1.938" hub bore
    • Works with outer bearing model 09067
    • Works with outer bearing cup (race) models 09194, 09195 and 09196
  • Lifetime warranty

Bearing Buddy installed diagram

Bearing Buddy Operation

Replace your existing grease cap with a Bearing Buddy to ensure a safe, easy way to monitor and control the level of grease in your axle hub. To adjust the amount of grease in the hub, use a grease gun to add more through the appropriate fitting. Adding grease moves the Bearing Buddy spring-loaded piston outward 1/8".

The O-ring inside the barrel of the Bearing Buddy maintains a seal from the outside. The interior of the Bearing Buddy is pressurized, preventing water from entering the barrel and diluting the grease.

An automatic pressure-relief feature is built into the Bearing Buddy. When the device is full, grease will seep around the edges of the piston and into the barrel. This prevents overfilling that can damage the inner seal.

You can manually check the grease level in your Bearing Buddy by pressing on the edge of the piston. If you can rock or move the piston, the hub is properly filled.

42308 Bearing Buddy Model 1938SS - Stainless Steel (Pair)

Customer Satisfaction Score:

Customer Reviews

Bearing Buddy Bearing Protectors - Model 1938SS - Stainless Steel (Pair) - BB1938SS

Average Customer Rating:  4.8 out of 5 stars   (25 Customer Reviews)

Great for marine applications; the stainless steel construction provides the best in corrosion resistance. The design makes Bearing Buddy an easy way to protect your bearings by keeping water out and ensuring enough grease is in the hub.


I have packed my wheel bearings on my trailer for the last time. Ordered a set of Bearing Buddies from and it took maybe 10 minutes to install them. Very high quality and will probably outlast my trailer. If you own a trailer and do not have Bearing Buddies on it.....Why not?

Marty M.


After a year the bearing buddies are working just as good as the day that I installed them. What used to be a half day job packing the wheel bearings are a half minute job.


Put bearing buddies on my boat trailer last year greased them up and basically you never have to worry about your wheel bearings. Checked them in the spring this year put 1 shot of grease in each side and trailer's good to go fishing for the season.


Ordered the wrong Bearing Buddies the first time the return process was quick and painless. My re-order arrived quickly and of course fit perfectly. These will make maintaining my trailer simple and quick, I'll never have a trailer without them.



Perfectly as expected.


I know the Bearing Buddy works great and just needed a replacement. etrailer has an easy to navigate site and more trailer parts than one could imagine. Their prices are great too!The customer service received at was STUPENDOUS!

I ordered the two new Buddies and within 10 minutes George J. with erailer emailed me and said the parts were in stock and would ship. An hour later I received another e-mail. This one was from Nancy W. She said the order was complete and had shipped. The e-mail provided a tracking number too. I chose the cheapest ship (4.99) and although I live in Washington state the package was received in 2 days. Everything was perfect!

I cannot overstate how great etrailer's customer service/communication was. I have never been a recipient of such great service on-line, no joke! Go with etrailer!!!!


One of the best internet ordering experiences I have ever had!!!!!!!!!! I use the Bearing Buddies on a 1950's Model WH60, Serial #2 John Deere disc harrow. Your follow-up and completing my order in such a timely manner is greatly appreciated. I was back to plowing this morning. Thank you, George


Bearing Buddies are a great addition to your trailer for easy axle maintenance


Great product for boat trailer. Have had them on all my trailers.


They were very helpful and delivered the bearing buddies quickly. I am using them on a sprayer to cut down on maintenance and repairs.


Great customer service in returning the wrong size that my trailer company recommended. Thanks to Chris W. for making this so easy. Have now received the new size in no time at all.


Used these for years there great. First time ordering from etrailer they were EXCELLENT to deal with great price and quick shipping. Thanks


The Bearing Buddy's arrived faster than expected and was actually cheaper than the manufacturers website!!


super fast shipping great product web site is super easy to use. thank you e-trailer.


Fit just like they should have. No issues and great quality!



Still no issues!


Great to do business withProduct was a hard to find item.
A call to etrailer verified that it was exactly what I needed.
Will buy from again.



Great product. Timely delivery. Easy install. Makes lubrication quick and easy.


The best service I have had in such a long time. Shipping was excellent , unbelievable FREE or 7.95 for 3 days- what a great deal!! Very happy , satisfied with eTrailer, I placed another order for rims. Getting return # was a sinch, very helpful, awzum personality peoples !!! Thanx for everything BTW, Bearing Buddy fit perfect, super quality. I could not find these anywhere else but


It’s the wrong size

Etrailer Expert

Heather A.


This particular bearing buddy fits a 1 and 938 thousandths inch hub bore. I recommend to measure the hub bore with a digital caliper to get the most exact measurement.


The product matched the description and arrived on the date it was supposed to.


Fast shipping great customer sevice


Thank you!



Fast delivery and very responsive!



by: 10/20/2021


See what our Experts say about this Bearing Buddy Trailer Bearings Races Seals Caps

  • Bearing Buddy for Hub with 1.928 Hub Bore & 09074 Outer Bearing
    The best option for you would be Bearing Buddy # BB1938. Your hub bore is 1.928 and this Bearing Buddy is for 1.938 hub bores. It will be a little snug, but that is not a bad thing when it comes to bearing protectors. This same Bearing Buddy is offered in a stainless steel version # BB1938SS.
    view full answer...
  • Recommended Grease Cap for Hubs With 1.931 Inch Diameter
    The Bearing Buddy Bearing Protectors - Model 1938 - Chrome Plated (Pair) # BB1938 or # BB1938SS in stainless steel are the closest fit to your hub bore with a diameter of 1.938 inches. These are drive in bearing protectors that will keep the concrete dust out and keep your system well maintained. They are drive in caps that are within 7/1000ths of an inch so they should work seeing as even a digital caliper can have that slim margin of error.
    view full answer...
  • Correct Buddy Bearing Protectors for 1-15/16 Inch Hub Bore
    The correct set of Bearing Buddy Bearing Protectors for a 1-15/16" hub bore is part # BB1938 for chrome or part # BB1938SS for stainless steel.
    view full answer...
  • Bearing Buddy for 1.938 Hub Bore
    We offer them. Your hub probably uses a 09067 outer bearing with a 1.938 hub bore. If that's the case, we offer a Bearing Buddy model that will fit. For a chrome plated model, use # BB1938 or for a stainless finish, use # BB1938SS
    view full answer...
  • Bearing Buddy Recommendation for Dust Cap that Measures 1-15/16 Inch
    1-15/16 inches in decimal form is 1.9375 inches which means for a Bearing Buddy you would want the # BB1938SS for stainless steel or part # BB1938 for chrome.
    view full answer...
  • Bearing Buddy Recommendation for Fitting Hub Bore that Measures 1-15/16 inch in Diameter
    The correct Bearing Buddy for fitting a hub bore that measures 1-15/16 inches is the Bearing Buddy part # BB1938SS which is a fit for 1.938 inch bores. Which 1-15/16 inch in decimal form is 1.9375 inch.
    view full answer...
  • Outer Diameter Measurement of Bearing Buddy Model 1938SS
    According to Bearing Buddy, there is actually a slight variation in the outer diameter so there won't be an exact measurement. The variation will be somewhere between a hundredth or thousandth of an inch. Either way, since the # BB1938SS is designed to fit a 1.938" hub bore you will be able to use these with your hub. These are drive in caps that are supposed to be snug so they won't fall out, and the .003" difference is acceptable.
    view full answer...
  • What is the Correct Bearing Buddy for Use on 2005 Airstream Classic
    You can determine what type and size of Bearing Buddy to use on your Airstream trailer by taking a look at the current hubs. You will need to know if the hub bore is threaded or not and you'll also need to take a precise measurement of the hub bore diameter using a dial or digital caliper. You'll need to measure to the nearest thousandth of an inch, or three decimal places like 1.781-inches. Once you know your type and size of hub bore you can use the linked page to select those features...
    view full answer...
  • Recommended Bearing Buddy Grease Caps for 1-15/16 Inch Diameter Trailer Hub
    If your hub measures 1.9375 inches like you referenced then # BB1938 in chrome or # BB1938SS in stainless steel will fit. These are often paired with the Spindle Grease Seal Set for 15123 Inner Bearing and 1.980T or 1.938 Bearing Buddy # BB60009 to give you a strong grease seal.
    view full answer...
  • Bearing Buddy Bearing Protector For a Hub With Grease Cap 1.90"
    The Bearing Buddy Bearing Protectors # BB1938SS are the closet we have to your 1.90" measurement. These fit a hub bore of 1.938". If you can send me some additional information on your hub/spindle including bearing sizes and grease seal dimensions I can see if we have a replacement hub that will come with a grease zerk or allow you to have a different size grease cap.
    view full answer...
  • Do You have Grease Caps for a 1.935 Bore Diameter Hub
    If there is any corrosion built up on the hub, it could be built up corrosion built up on the hub bore making the hole read smaller. Grease caps do not have to be very deep. They only have to go in far enough to fit snug and tight inside the hub bore. Many grease caps have a flange length of just a little over a 1/4 inch, and most are well under a 1/2 inch. If their is a bit of corrosion, try lightly scrubbing with some steel wool. After cleaning it up, a 1.943 cap like part # F001524...
    view full answer...
  • Recommended Bearing Buddy For 1.935 Trailer Hub
    I would be happy to make a recommendation for you. Based on the measurement you provided you will need the Bearing Buddy Bearing Protectors Chrome Plated # BB1938 or Stainless Steel # BB1938SS which is for a 1.938" hub bore. If you do not already have a grease gun to use with the Bearing Buddy you may be interested in the # PTW54290. I included videos for each of the products mentioned for you to take a look at.
    view full answer...
  • Availability of Bearing Buddy Bearing Protectors With Hub Bore Diameter Less Than 1.98 Inches
    I am assuming you have a Bearing Buddy that fits a 1.98" hub bore diameter like the # BB1980A-SS and are not referring to the outer diameter. The next size down from there would be the # BB1968SS which fits a 1.968" hub bore. To go beyond and take it another size smaller would be the # BB1938SS which fits a 1.938" hub bore. I have attached a link to all of our available Bearing Buddy Bearing Protectors for your reference. You can filter them by hub bore diameter should you find that you...
    view full answer...
  • Bearing Buddy Bearing Protectors For a Trailer Hub with 1-15/16" Grease Cap
    We do have the Bearing Buddy Bearing Protectors # BB1938SS which fit a 1.938" hub bore. There is also the # BB1968SS which fits a 1.968" hub bore and # BB1980A-SS for a 1.980" hub bore. I included these other options as the measurements are very close and you should verify the exact one you need with a Digital Caliper # PTW80157.
    view full answer...
  • Recommended Grease Cap With Grease Fitting
    Since I'm assuming you don't have an E-Z Lube axle or some equivalent with the zerk fitting on the end of the spindle, the only option would be to use a Bearing Buddy. What you have heard about the grease getting pushed out of the back only happens if they are overfilled. As long as you make sure to not add too much grease this will not be an issue. Before choosing a Bearing Buddy I recommend measuring the hub bore diameter. I would also use a digital caliper like the # PTW80157 since...
    view full answer...
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  • Replacement Dust Cap/Bearing Buddy For a Hub With Bore Measurement of 47MM
    The Bearing Buddy Bearing Protectors # BB1810 is the closest cap we have to your 47mm measurement. The Bearing Buddy fits a hub bore of 1.810" while 47mm is 1.850" so you will want to verify the exact measurement with a Caliper # PTW80157 to ensure if this will fit. The next largest size Bearing Buddy # BB1938SS fits a 1.938" hub bore. We currently do not have dust caps that match the measurements of the Bearing Buddy's I listed above.
    view full answer...
  • Bearing Buddy Sizes for Replacing Grease Cap on Utility Trailer
    I would first recommend getting a Digital Caliper # PTW80157 to measure the hub that the Bearing Buddy will be pressed into. This will insure that you have a correct fit. Bearing Buddy Sizes -1.781" # BB1781SS -1.810" # BB1810 -1.938" # BB1938SS -1.968" # BB1968SS -1.980" # BB1980A-SS -2.047" # BB2047SS -2.080" # BB2080SS -2.240" # BB2240SS -2.328" # BB2328SS -2.441" # BB2441SS -2.562" # BB2562SS -2.717" # BB2717SS
    view full answer...
  • Trailer Hub Bore Caps Which Fit Between 1.9" and 2.0" Hubs
    It is best to use a Digital Caliper # PTW80157 to determine the exact size of your hub bore to find the correct size cap. A 1.986" Cap # 34151200 is the most commonly found size on current 2,000lb and 3,500lb axles. We do also have a couple Bearing Buddy protectors in a few other rare sizes you can use. 1.938" Hub Bore # BB1938SS 1.968" Hub Bore # BB1968SS 1.980" Hub Bore # BB1980A-SS If none of these sizes will fit please let me know what size hub and bearings you have as I can recommend...
    view full answer...

Do you have a question about this Trailer Bearings Races Seals Cap?

Info for this part was:

Employee Tyler C
Written by:
Tyler C
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Chris R
Video Edited:
Chris R

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