Trailer Hub Grease Cap, 2.72" OD Drive In - Qty 2

Part Number: RG04-100

110 Reviews | 10 Questions

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redline trailer bearings races seals caps hub grease cap 2.72 inch od drive in - qty 2

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The Low-Down on the Trailer Hub Grease Cap, 2.72" OD Drive In

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Great Prices for the best trailer bearings races seals caps from Redline. Trailer Hub Grease Cap, 2.72" OD Drive In - Qty 2 part number RG04-100 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.

Redline Trailer Bearings Races Seals Caps - RG04-100

Trailer Hub Grease Cap, 2.72" OD Drive In

Quantity: 2

RG04-100 Trailer Hub Grease Cap, 2.72" OD Drive In - Qty 2

Video of Trailer Hub Grease Cap, 2.72" OD Drive In - Qty 2

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

The Low-Down on the Trailer Hub Grease Cap, 2.72" OD Drive In

Video Transcript for The Low-Down on the Trailer Hub Grease Cap, 2.72" OD Drive In

Today we're going to take a look at the trailer hub drive-in dome style grease caps. These have a 2.72 overall diameter. This is for a quantity of two. These grease caps are for the trailer hubs commonly used on 5,200 pound to 7,200 pound axles. These are 22 gauge steel construction. They are a drive-in installation.

The nice thing is they have a corrosion resistant zinc plating on them. Again this part is for a quantity of two. The two important measurements are the flange diameter which is that diameter and then the overall height. We've got our ruler here. We're going to measure the flange diameter is 2.72".

The overall height from the bottom to the very highest point is going to be right at 1.44". That should do it for the review on the trailer hub drive-in dome style grease caps with the 2.72 overall diameter. It's for a quantity of two.

Customer Satisfaction Score:

99% were satisfied with this product

1% of customers were not satisfied

4.7

110 reviews

5 Stars		(89)
4 Stars		(12)
3 Stars		(4)
2 Stars		(2)
1 Star		(3)

by: Bruce 02/21/2017

Last week I started thinking about my kayak trailer and what repairs needed to be completed before the spring and summer usage.

In 2011 I converted a small sailboat trailer to a two place kayak trailer. I ordered bearing kits wheels and tires at that time from e trailer. Every year I pull the wheels and grease the bearings and I install new grease seals. Last year when I was doing my maintenance I found that the bearing races were lightly rusted and pitted because the trailer was buried under a large snowfall. The bearings were fine and I cleaned up the races with steel wool. I decided I would replace everything come winter. I ordered bearing caps to replace my old dented caps hoping that this will keep the bearings dryer. I made a place in the garage to keep the trailer from the weather.

I placed a call to you guys and was greeted by a very friendly voice on the other end of the phone. Brandon was able to find my past order saving me time and effort. (My filing system could be better.) He was able to e-mail me copies of my previous orders and shortly there after I placed my order on line for new bearing kits and a few extra seals and well you know the rest. I tell everyone about the excellent service I get from etrailer.com.

keep up the good work.

Click to Enlarge

Bruce One Year Later

2/26/2018

Its very nice that you would follow up. The products I purchased performed perfectly. I am only able to purchase the double lip seals through you. I cannot find them localy. Thank you for selling a superior product.

by: Todd 12/25/2024

Not tall enough for 1996 Featherlite trailer with 8000lb torsion axles. They go on but just touch the axle nut. They start to push off when the tire flexes while turning. Lost one on a 200 mile trip and 2 more were coming loose.

by: Mike 10/19/2015

Good quality grease cap. Matches the cap that I lost off my Military trailer and is better then the grease cap I purchased from Napa, which was a little thin.

Highly suggest these caps vs. what I have found locally.

by: Bret 05/13/2022 One Year Later

Prefect fit for my M1101 Military Trailer. Quick shot of paint and it looks factory.

by: Timothy 10/28/2024

I don't need these for a hub grease cap. I am searching for and end piece for my vise - an old Wilton C2. A comment on another site linked to these caps. I'll find out soon if these work or if the search continues.

by: Mark 07/11/2018

quality parts .. great staff , it's always a pleasure to do business with etrailer .. fast shipping and low prices.. thanks George , lookin forward to many more transactions with this company..

by: Joel 08/01/2014

Good steel dustcover caps. Needed the high dome cap to clear the nut. Very pleased. Fast shipping. Good customer service. Will use again. Joel in Iowa

by: Victor 07/02/2022

wrong size for the 2nt time. look up my name in your orders. i will give you one more chance

Katrina B.

7/6/2022

To pick out a grease cap you would need to measure the diameter of the bore of your hub where the current cap is so that we can pick you out the correct replacement.

by: Andrew F. 05/09/2019 One Year Later

The hub covers did just fine, however I ended up getting a whole new axle, so i didn't really get to use them. That was now fault of your's though. Thanks.
Andrew F

by: Robert B. 01/08/2015

Excellent products and the web site is very easy to navigate through. The products they sell are of great quality and durability and affordable. shipping is fast and reliable. Being able to see the products and all the information is a lot of help when searching for parts.. Robert B.

by: George 04/09/2019

Same as original, needed when I repacked the wheel bearings. Fast shipping.

by: Wade 01/14/2022

Dust caps fit perfectly! Would order from again

by: Gary 11/24/2020

Wonderful service ! etrailer is my go to company for parts!

by: Jerry 11/26/2021

Arrived very quickly, looks like it will work as described.

Jerry One Year Later

11/27/2022

When I went to install the caps they would not go in , so I had to go to my bench grinder and grind off a small amount of metal so I could install it on the hub.

by: James 11/22/2022 One Year Later

Great service

James One Year Later

11/23/2023

Very helpful, good product,would purchase again from this company

by: Keith 05/29/2018 One Year Later

Great fit replaced missing originals. They have stayed put over a year now, over some pretty rough gravel roads. I'd order these again.

by: Brad H 10/04/2017 One Year Later

One flew off in the first trip out the door and the others are still there to this day

by: Helton 03/02/2018 One Year Later

excellent products very satisfied with the purchase, highly recommend

by: Hans 05/12/2020

The kit arrived quickly and in good condition. All of the parts fit perfectly and I was able to assemble my hub in less time than I had planned for.

by: Robert 12/17/2024

Fast service! Great communication!

by: Ron 07/25/2026 One Year Later

by: charles murphy 03/30/2016

Very good quality parts very happy with purchase

by: Michael 04/29/2023

Perfect fit. Fast delivery.

by: David 08/31/2021

They fit perfectly

by: Tru-Craft 08/28/2022

110

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

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

Which 6 On 5-1/2 Bolt Pattern Hubs Will Fit A 2008 M1101 HMMWV Trailer?
From what I could find, your 2008 M1101 HMMWV trailer will use the # 25580 inner bearing, but the outer bearing is proving to me more difficult to locate. It looks like it has a 1.25" inner diameter, which does match two hub and drum assemblies we have. These do use different seals though, so you will need to pull one hub, or both, so see which will be the correct option. I have both options listed below and these do have the needed 6 on 5-1/2 bolt pattern and 12" diameter drum. Trailer...
view full answer...
Replacement Bearing Cover Options for Bri-Mar Dump Trailer
You will need one of two sizes depending on the axle capacity of your Bri-Mar dump trailer. If you have 7,000 lbs or 8,000 lbs axles, then you will need part # 21-43-1 and # DC-RP if you have EZ Lube spindles (grease zerk on the end) or you can use part # RG04-100 if you have standard spindles. If you have 5,200 lbs or 6,000 lbs axles, then you will want part # RG04-080 if you have EZ Lube spindles or part # RG04-060 if you have standard spindles.
view full answer...
Adding Disc brakes To A Fifth Wheel With 7K Axles With 6 on 5-1/2" Bolt Pattern
We do recommend switching over to an 8 on 6-1/2" bolt pattern when adding disc brakes to a 7K axle. All of the 6 lug disc brake kits are going to be rated for 6K and under. For a full disc brake conversion I recommend the Hydrastar Conversion Kit # HSE7K-T1. This is a complete kit, so you get everything you will need to convert your 7K electric brake axles over to disc. This uses the # 25580 and # 14125A bearings which are basically standard for 7K axles. The only thing you will need...
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Grease Caps For Hubs on Lippert 7,000 lb Axles
We have grease caps for a 7,000 lb Lippert axle (including torsion axles), though I do need to say that grease caps are are drive-in, and oil caps are screw-in. I verified with Lippert what the correct grease cap is for their 7,000 lb axle, which is the following: - Standard Grease Cap: Trailer Hub Grease Cap # RG04-100
view full answer...
If a Wheel Has a Hub Cap is a Grease Cap Needed Still
You still need a grease cap if your wheel has a hub cap. A hub cap is purely a decorative item to make a wheel look nicer. A grease cap actually serves a purpose by holding the grease of the hub in so that it stays lubricated. I attached a page that has all of our grease caps. To pick out one out you will need to measure the pilot hole of your hub.
view full answer...
Available Grease Caps for Threaded Trailer Hubs With an Inner Bore Diameter of 3-5/8-Inches
It sounds like you may be looking for Bearing Buddys that will fit your threaded hubs. The standard drive-in grease caps you referenced, part # RG04-100, fit a non-threaded hub bore of 2.72-inches, a good bit smaller than yours. The standard grease cap nearest to your size is part # F001603 which fits a non-threaded hub bore of 3.882-inches. Bearing Buddy grease caps are available in sizes for hubs up to 2.717-inches inner diameter but none will fit your 3-5/8-inch hub bore.
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Wheel Trim Options and Grease Caps for a Vintage Trailer
A hub cap is going to cover the whole wheel in many cases whereas a grease cap only covers the hub bore so it is much smaller. Think of it as a hub cap covering the whole hub and a grease cap just covering the open end on the hub. A good look for a vintage trailer would be the Americana Baby Moon Trailer Wheel Center Cap, # AM90086. It fits 13 to 15 inch conventional wheels. However, the chrome plated steel may be too much flash for what you are going for. If you want the wheel appearance...
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Electric Drum Brakes To Hydraulic Disc Brake Conversion Kit For 7,000-lb Axles
The best electric drum brake to hydraulic disc brake conversion kit we offer for 7,000-lb axles, is the HydraStar Disc Brake Kit w/ Actuator for Tandem Axle Trailers # HSE7K-T1. This kit has everything you need to switch your trailer's brakes to disc, and, includes the hub-and-rotor assemblies with bearings, races, and seals. You'll also need grease caps, you can use the Trailer Hub Grease Cap, 2.72" OD Drive In # RG04-100.
view full answer...
Replacement 2.72 Inch Diameter Grease Seal for a Trailer Hub
It sounds like you need a grease cap for your trailer hub. If this is the case then I recommend using part # RG04-120 if you have E-Z lube axles or part # RG04-100 if you do not. These caps are both press-in but if you have trouble then I recommend placing a rag over the cap and tapping it with a hammer very gently.
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Do you have a question about this Trailer Bearings Races Seals Cap?

Info for this part was:

Expert Research:

Michael H

Expert Research:

Jameson C

Expert Research:

Adam R

Installed by:

Jeff D

Video Edited:

Chris R

Updated by:

Wilson B

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