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Lock Washer for Brake Mounting Bolt for 12" Brake Assemblies - 3/8" Diameter

Lock Washer for Brake Mounting Bolt for 12" Brake Assemblies - 3/8" Diameter

Item # 38LW
Our Price: $1.68
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3/8" Diameter lock washer fits mounting bolts for 12" brake assemblies. 1-800-940-8924 to order ABS Fasteners accessories and parts part number 38LW or order online at Free expert support on all ABS Fasteners products. Great prices and Fastest Shipping for Lock Washer for Brake Mounting Bolt for 12" Brake Assemblies - 3/8" Diameter. Accessories and Parts reviews from real customers.
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  • Reviews (32)
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  • Videos (1)
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ABS Fasteners Accessories and Parts - 38LW

  • Trailer Brakes
  • Electric Drum Brakes
  • Hydraulic Drum Brakes
  • Hardware
  • Washers
  • ABS Fasteners
  • 12 Inch

3/8" Diameter lock washer fits mounting bolts for 12" brake assemblies.


  • Lock washer fits 3/8" mounting bolts
    • Works with 12" brake assemblies
  • Zinc plating is corrosion resistant


  • Diameter: 3/8"
  • Quantity: 1 lock washer

37WMSL0Z Lockwasher for Brake Mounting Bolt for 12" Brake Assemblies - 3/8" Diameter

Replaces 38LW Lockwasher for Brake Mounting Bolt for 12" Brake Assembly

Video of Lock Washer for Brake Mounting Bolt for 12" Brake Assemblies - 3/8" Diameter

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

Video Transcript for Redline Trailer Brakes 38LW Review

Today we're going to review part number 38LW. This is the 3/8 inch size Lockwasher for the Brake Mounting Bolt for 12" Brake Assembly. This locker needs to be used with the 3/8 inch size Brake Mounting Bolt. We do sell the mounting bolts separately also. That's listed on on our website. It is listed on the product page for this washer as a related product; it's part number 7-5.

The Lockwasher will go on the bolt. The other parts you would need that's a related product is the nut; that's part number 38N. This is the 3/8 inch size nut. All these three pieces together is what would hold your brake assembly to your trailer. That should do it for the review on part number 38LW.

This is the 3/8 size lock washer for the 3/8 inch brake mounting bolt for the 12 inch brake assembly.

Customer Satisfaction Score:

Customer Reviews

Lock Washer for Brake Mounting Bolt for 12" Brake Assemblies - 3/8" Diameter - 38LW

Average Customer Rating:  4.8 out of 5 stars   (32 Customer Reviews)

3/8" Diameter lock washer fits mounting bolts for 12" brake assemblies.


Replacing the brakes on a 50 year old FAN camper. After being assured that it had 10 inch brakes by another company"s "expert" because it has a 3500# axle, I finally received the correct 12 inch brakes from eTrailer. They arrived very quickly, and packaged well. The installation went almost as easy as the very helpful online video showed. Only difference was I had to slightly tighten the brakes to slide the hub over them, even though they are self-adjusting once in service. I have never owned or worked on a trailer before, and the installation was relatively easy. Thank you to George J for the followup email within 24 hours of delivery.


The electric trailer brakes arrive within three days of ordering. The parts were a perfect fit. Etrailer' support is second to none! Helpful videos and live support available. The four trailer brakes were $100.00 less expensive than the nearest competitor and free shipping too!


very easy to get the right parts, Great service.

We will be back as we need parts
etrailer is the place to buy parts great price and fast turn around time with complete service to help you figure things out.
Get your barring number and just call or go online. They will identify the parts you need for sure from the original barring you have.
-Joe M.


Nuts and bolts are nuts and bolts but I can report that the self-adjusting brakes have worked well on our two-thousand mile trip this summer through the mountains of Utah, Idaho, Nevada, Oregon and Washington. They stop straight and true and don't seem to fade on those long down grades like the infamous "Cabbage Hill" near Pendelton Or.


good quality product for reasonable price.e-trailer close to half price of what local dealers/suppliers are charging. shipping a little long, but it was in between chrismas and new years. will definately order from e-trailer again! thank you e-trailer


The whole order was perfect. I'm rebuilding the running gear on a1976 3 horse slant then remodeling the whole trailer by converting the trailer into a communications trailer for HF radio for disaster response. Front area will be living quarters. I am in our State Guard as a radio operator and also in county emergency management. This trailer will be my shelter and operating station when deployed to hurricanes and such. Since I'm spending my own funds on this, the good prices on etrailer are greatly appreciated.


The brakes were exactly the ones I needed. Not knowing I worked with John by cross matching numbers on bearings and so on. He held on the phone while I searched for the numbers. Excellent company, excellent people and very knowledgeable. Will use in the future for any product that they carry. Thank you very much and my horses are safer because of you. Washers, nuts, brakes, and everything else was great.


My package arrived on time just as I expected. I was a bit disappointed with the packing. Everything came in one box. The washers were not in any bag they were just loose in the box. I ordered 10 but I only received 8. I think the other 2 fell out the bottom of the box that was not completely sealed with tape. You might want to put small parts in a zip lock bag. Anyway I only replaced the washers on one of the brakes and used the old ones on one.


bought a brake assembly that needed fastening to the axle; these nuts, bolts and washers were just what I needed. Thanks George J.


Carla M. worked with me to make sure we had all the right parts for my boat trailer. I am quite happy with her help.


Thank you for the great service and right parts , everything is working great. I will definitely buy from etrailer again when I need trailer parts !!


Ordered lots of parts on Monday, received most of them by Thursday. The received parts were well packaged and undamaged. A few of the parts they didn't have in stock so they had those drop-shipped to me which should be delivered in the next couple of days.
No supplier I have ordered any parts from has such a great technical reference web site or personal customer support. Yea, Rebecca - Well Done! Yes, I'm very happy with the pricing.
Thanks for your great support and I look forward to doing business with them again. More info to follow as soon as I can get the parts installed on my trailer.


These lock washers worked great! Some of the best lock washers I've ever used! I highly recommend them!


I have received my order but have not yet installed the assemblies, I would like to say your team was very helpful and got me the parts I needed at a great price. I will be placing future orders with Etrailer. Thank you!





Great service. Etrailer does an excellent job of filling the orders and getting them sent. Shery was really good handling our order. Thanks again.


The parts have worked out very well and have not had any problems. Thanks again for the parts and good service.

Millard J.


Sorry it took so long to answer but have been real busy. My daughter is very happy with the parts that we have gotten from you and things are still good. Thank you for asking,


It's a lock works!


They are lock washers they are ok.


Just as described, arrived promptly as always from etrailer.


All parts ordered were of excellent quality, Thanks!


Received the right parts on time had a fair price


As expected.
What I did not expect was
the fast delivery. It took two days for the item to arrive. Thanks.


Everything came on time and installed with no problems!


Split washer for 3/8 bolt

Show More Reviews

See what our Experts say about this ABS Fasteners Accessories and Parts

  • What Kind of Steel is Brake Mounting Bolt 7-5 Made From
    This Brake Mounting Bolt for 12 inch Brakes Assembly, part # 7-5, is not made of stainless steel, it is made of regular steel. You might also be interested in purchasing a Nut for Brake Mounting Bolt for 12 inch Brake Assembly, part # 38N, and a Lockwasher for Brake Mounting Bolt for 12 inch Brake Assembly, part # 38LW.
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    I walked out to the warehouse to look at the Electric Brake Assembly for 6K Axles, part # 23-459. The brake assembly does not include the backing plate bolts. I would recommend installing new bolts and nuts for easier installation and safety. For mounting bolt, you would need Brake Mounting Bolt, part # 7-5, which is sold as a quantity of 1. For mounting nuts, you would need Nut for Brake Mounting Bolt, part # 38N, which is also sold in quantity of 1. You will also want to use Lockwasher...
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  • Trailer Brake Assembly Recommendation for Dexter Assemblies Marked 023-106 for Both Sides of Axle
    Sounds like you need the brake assemblies part # 23-105 and # 23-106 to provide you with brake assemblies for both sides of your trailer. These are 6k Dexter brake assemblies that are 12 inches in diameter. For a replacement nut the part # 38N typically is what is used. For a lock washer part # 38LW.
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Employee Jeff D
Installed by:
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Employee Hannah L
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