Trailer Light Mounting Bracket for 4" Trailer Lights, Steel - Black Powder Coat

Trailer Light Mounting Bracket for 4" Trailer Lights, Steel - Black Powder Coat

Item # BK45BB

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  • Trailer Lights
  • Mount Parts
  • Mounting Brackets
  • Optronics
  • 4 Inch Diameter
  • Black
6" L x 5-13/16" W with 1-3/8" base; Powder coated steel; mount vertical or horizontal; requires A45GB grommet; mounts on 4" centers Call 800-298-8924 to order Optronics accessories and parts part number BK45BB or order online at etrailer.com. Free expert support on all Optronics products. Guaranteed Lowest Price and Fastest Shipping for Trailer Light Mounting Bracket for 4" Trailer Lights, Steel - Black Powder Coat. Accessories and Parts reviews from real customers.


  • All Info
  • Reviews (43)
  • Q & A (24)
  • Videos (1)
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Optronics Accessories and Parts - BK45BB

6" L x 5-13/16" W with 1-3/8" base; Powder coated steel; mount vertical or horizontal; requires A45GB grommet; mounts on 4" centers


Trailer Light Mounting Bracket for 4" Round Lights, Steel - Black Powder Coat

A black, steel bracket for mounting 4" round lights. The bracket measures 6" long x 5-13/16" wide with a 1-3/8" deep mounting base. The bracket has a 4-1/2" wide hole in the center for mounting the light, and has six screw holes in the bracket spaced equally around the hole. The black powder coated bracket is made from sturdy, durable steel and can be used to mount lights vertically or horizontally. The bracket base mounts on 4" centers. Along with the sealed light, the A45GB grommet is required to complete the installation.

  • Black, powder coated bracket for mounting 4" round lights
  • Constructed from strong, durable steel
  • Mounts lights vertically or horizontally
  • Lights mount into 4-1/2" hole in center of bracket with 6 surrounding screw holes
  • Base mounts on 4" centers
  • Dimensions: 6" L x 5-13/16" W with 1-3/8" deep base
  • Requires grommet A45GB to complete installation

Manufacturer Specifications

Black powder coated steel bracket for horizontal or vertical mounting on 4" round lights. A45GB grommet required for complete installation.

dimensions of light


BK45BB Black Bracket for 45 Series, Powder Coated by Optronics, Inc.

Alternate part number: BK-45BB







Video of Trailer Light Mounting Bracket for 4" Trailer Lights, Steel - Black Powder Coat


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




Video Transcript for Optronics Trailer Lights BK45BB Review

Today we're reviewing Optronics part number BK45BB. This is a trailer light mounting bracket for four inch trailer lights. It's made of durable steel and it has a black powder coat finish that resists rust and corrosion. It works with four inch lights and grommets, but the cutout hole is four and a half inches. If you don't already have a rubber grommet, you should be using this one from Optronics. This is sold separately on our website. It's the Oprtronics four inch rubber grommet, part number A45GB. I have a light here also, so we can show you how this works. Let's get the grommet on the light and then it fits into the four and a half inch mounting hole like that and gives you a nice weather resistant seal.

The rubber also will cushion the light and help protect it so it will last longer. Now let's look at some dimensions. This mounting bracket is six inches long. It's five and thirteen-sixteenths of an inch tall. The center hole, as we said, is four and a half inches in diameter. The mounting holes are four inches apart in center hole, from the center of one to the center of the other. The lip at the top is one and three-eights of an inch deep. There you have it for part number BK45BB, from Optronics, the trailer light mounting bracket for four inch trailer lights. .


Customer Reviews

Trailer Light Mounting Bracket for 4" Trailer Lights, Steel - Black Powder Coat - BK45BB

Average Customer Rating:  4.9 out of 5 stars   (43 Customer Reviews)

6" L x 5-13/16" W with 1-3/8" base; Powder coated steel; mount vertical or horizontal; requires A45GB grommet; mounts on 4" centers

- BK45BB
by:

Brackets are ok, but whoever made them skipped 30 seconds of prep work by not cleaning up the edges of the bracket. Cut my hand multiple times while installing the taillight into the bracket. Simply some quick sanding or some wire wheel work would have solved this. No point in doing it now as it would damage the powder coating. Mildly annoyed, but still decent product for the price. 90710


Comments

After a year of use they are still holding up. Powder coating is resisting the elements well. Im still satisfied with the purchase. Despite the issues I had with the manufactures product prep did not effect the performance of the part. Would by again if needed.

Jason - 01/19/2015

8721

- BK45BB
by:

Here's installed photos... 554839



- BK45BB
by:

Good product good service I like ordering from E trailer 625696



- BK45BB
by:

Very durable mount 602863



- BK45BB
by:

As indicated! On time! Good quality! Fair price! 583773



- BK45BB
by:

professional and fast service....thanks 538591



- BK45BB
by:

Converting an older home made trailer to LED lighting. These high quality parts worked great. Received order within 3 days. Thanks 501682



- BK45BB
by:

Great product ... Exactly what I needed! Worked Great! Thanks ! 469425


Comments

Super Product .... Very Pleased !

Barry H - 01/25/2019

48856

- BK45BB
by:

Great prices just what I needed fast delivery thanks 467246



- BK45BB
by:

Great strong bracket made out of quality metal and comes prepainted that isn’t easy to scratch. 464437



- BK45BB
by:

Great product 459826



- BK45BB
by:

Not a lot to say about the product, it's pretty simple and does everything it's supposed to do. What was remarkable was the help I received from etrailer finding the product and the speed at which it was delivered to me. I am a happy customer. 434077



- BK45BB
by:

I bought Brackets, Rubber grommets, Sealed round ( ST45RB ) lights and wire ends plugs. I also bought 4 other bulb lights. The sealed round lights don't fit tight in the rubber grommet, the light has a loose fit and the light turns in the grommet. One of the sealed lights only lasted 2 weeks and it went out. 427457



- BK45BB
by:

I buy many products from Etrailer -- Very high quality merchandise - exactly what I need for my business- super service- fast delivery time - I always get what I expect- I have told other people where I get my trailer stuff ----- I have a golf cart repair business and wire trailers--- (excellent rating) --- Dale A. 409341



- BK45BB
by:

Service was excellent. Part(s) lived up to my expectations-as usual. 396414



- BK45BB
by:

Great quality. Super fast delivery. 383603



- BK45BB
by:

Great product. Installed in minutes well worth the little bit of money 368281



- BK45BB
by:

great pricing along with quick service 359855



- BK45BB
by:

everything looks great ,decent price 304738



- BK45BB
by:

Bracket look great and fit my lights perfectly. Once I get them mounting I think they will look great as well. 274130



- BK45BB
by:

Good sturdy mount. Only problem is they will start rusting after a season or two if you use them in salt water. I wish they made them with a galvanized finish or out of Stainless steel 263146



- BK45BB
by:

fast shipping very happy look good on my old trailer 241090



- BK45BB
by:

These brackets are exactly what I neede d. 232533



- BK45BB
by:

Great company !! Had the right products in stock and shipped the right products ! Only took a few days to receive order. Will definitely order from this company again. 224249



- BK45BB
by:

GREAT SERVICE QUICK TO SHIP 222968



- BK45BB
by:

Received on time As advertised 215059



- BK45BB
by:

Got these for my car trailer. Was originally going to cut mine out out of plate steel but these were to cheap not to get. They are very strong with good thick metal. Going to weld them on instead of bolting but either way, I think they would be plenty strong. Great product, well worth it. 211301



- BK45BB
by:

Great looking product, can't wait to install and see how they look. Thanks etrailer for fast service 180344



- BK45BB
by:

did what i wanted 166770


Comments

does its job

fred - 12/26/2015

16236

- BK45BB
by:

Item is exactly as described. High quality, Heavy duty material. This was a smooth Transaction, shipping was fast, price was good and I will Definitely do business here again. Thanks again 134995



- BK45BB
by:

Lights fit right into brackets 132123



- BK45BB
by:

great looking bracket should work just fine. 117074



- BK45BB
by:

Brackets are extremely solid and well built, I am confident they will last a very long time. Because of their durability I was not able to bend them to the angle I wanted but I was able to relocate them to a new position on the trailer. 84229



- BK45BB
by:

Works perfectly with the round LED lights (product STL42RB in my case). 81293



- BK45BB
by:

Received the brackets in quick time and good condition. Am pleased with product, but have not had time to mount them as yet. But I am sure they will be what I wanted. Thanks for the quick service. Sylvia S. 60745



- BK45BB
by:

Nice bracket! High quality, heavy duty part. 32087



- BK45BB
by:

The bracket is excellent quality. Heavy duty construction and fit the light assemblies and grommet perfectly. The shipping was extremely quick, and the price just right. Would recommend etrailer.com highly. 30586



- BK45BB
by:

I purchase some 4" round LED tail lights with grommets and was trying to find a way to mount them. Then I found this mounting bracket on etrailer.com and ordered 4 of them. I have just received them and they work perfectly with the 4" round LED tail lights. Thanks etrailer. Troy D Smith 29491



- BK45BB
by:

i ordered my part in the AM and it was shipped the same day! Great turn around... 28170



- BK45BB
by:

EXCELLENT PRODUCT AND REASONABLY PRICED, FAST SHIPPING. 27003



- BK45BB
by:

Sturdy, well made and with a weather proof paint job. 23971



- BK45BB
by:

Bracket was very affordable. I was somewhat concerned that it might be flimsy or too light to protect the LED light I wanted to use. But the bracket is well painted, the hole selection matches perfectly with the three holes in the light rim. The bracket is very solid and an excellent weight to last. You will like this bracket if you need to mount a 4 1/2 inch tail/stop/turn light. 15318



- BK45BB
by:

Great product. 5938


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Ask the Experts about this Optronics Accessories and Parts
Do you have a question about this Accessories and Part?


  • Are there Replacement Tail Lights for a 1982 Scamp Trailer
  • In order to determine which replacement lights will fit your 1982 Scamp trailer, you will need to find the manufacturer and model number of the light assembly. This could involve removal of the assembly. If you see numbers on the lens, those are not the correct numbers. If you cannot find any manufacturer/model number information, you will need to measure the diameter of your existing tail lights and any other dimension that you can. You will also need to determine how they mount to...
    view full answer...

  • Recommendation for 24 Volt Trailer Lights
  • We do have some lights that are designed to work on a 24 volt system but none that are available in a kit. I recommend using light # STL23R24B. There are a few ways to mount this light. You can use a grommet and flush mount it using # A45GB. Or you can surface mount it with a bracket, # BK45BB. You will also use a wiring harness, # A47PB.
    view full answer...

  • Installation Assistance With Mounting Hole Dimensions Optronics GLOLight LED Stop/Turn/Tail Light
  • To install the Optronics GLOLight LED # STL101RMB you will also need grommet # A45GB. There are two mounting options for this LED light. The first one is using Optronics grommet # A45GB and mounting directly into your 1998 Jeep Wrangler. The other option is using the Optronics Mounting Bracket # BK45BB. If you decide to use the mounting bracket, you will still need the grommet as well. If you are mounting using the grommet only the grommet opening is 4-1/2 inches. When cutting...
    view full answer...

  • How Thick Of a Plate Will the Optronics Rubber Grommet for 4 Inch Round Lights Fit
  • I went out to our warehouse to measure the seat of the # A45GB grommet that you referenced. It seems like it will be a tight fit for your 3/8 inch bumper. The grommet seat measures 0.24 inches. Another option for mounting a 4 inch round light on your trailer, instead of the bumper, is to use the Trailer Light Mounting Bracket # BK45BB. This may not work for your application, but it could also be modified to work how you need. This bracket will work well with the rubber grommet # A45GB.
    view full answer...

  • Could Use a Trailer Light Mounting Bracket with a Sealed 4 Inch LED Stop Light
  • Yes, I went out into our warehouse and pulled a Sealed, 4 inch Round LED Trailer Stop # STL42RB and a Trailer Light Mounting Bracket # BK45BB and found that they work together very well. All of the mounting holes from the # STL42RB line up with the # BK45BB. You would need bolts that have a diameter of no more than 3/16 of an inch to attach the light to the bracket. I attached a picture to the right that shows how these products would look if installed together. You might also...
    view full answer...

  • Replacement LED Trailer Tail Lights for a 2005 Gulfstream BT Cruiser
  • Optronics trailer tail light # ST45RB is potentially a fit for your trailer if the existing lights are one of the following: Uni Bond # SE4000R Wesbar # 423541 Truck Lite # 40282R/40202R Grote # 52922 Peterson # 426R Bargman # 40-01-001 This information is likely on the light housing somewhere on your existing lights. The 2 knobs on the back are not an issue since this light would mount in a hole in the trailer or in mounting bracket # BK45BB both using grommet # A45GB. If...
    view full answer...

  • What Size are the Mounting Holes for the Trailer Light Mounting Bracket # BK45BB
  • I went out to the warehouse and measured the mounting holes for the trailer light mounting bracket # BK45BB. The larger holes on top are 0.36 inches in diameter so 5/16 inch hardware would be the largest you could use. The smaller holes on the face of the bracket will accept up to 1/8 inch hardware. I also made a video showing the measurement of the large holes using digital calipers.
    view full answer...

  • Can the 4 inch Rubber Grommet # A45GB be used in a 4-3/4 inch Mounting Location
  • I do have a solution for you, since the hole that you are placing the grommet in is 4.75 inches, the grommet that you referenced, the Optronics # A45GB, might push through that mounting hole since the overall diameter is 5-3/8. Depending on your exact mounting location you might be able to use the # BK45BB to install on your light mounting location then use the 4 inch grommet # A45GB to hold a 4 inch light. I am not sure if this will work for your application but you might also be able...
    view full answer...

  • Wiring and Mount for Optronics 4 Inch Round Trailer Light # ST45RB
  • Sealed, 4" Round Trailer Stop, Turn and Tail Light, Flush Mount, 3-Function Item # ST45RB has a plug in the back to accept pigtail # A45PB. On it the white wire is ground, black is for tail lights, and red is for brake lights and turn signals. This light can be mounted using grommet # A45GB with bracket # BK45BB. Or if mounting directly in a surface you would just need the grommet. I have linked videos of all of these parts for you.
    view full answer...

  • Troubleshooting Light Not Working with the Cargo Carrier Light Kit # 52014
  • If you installed the Cargo Carrier Light Kit # 52014, which fits carriers # 52018F, # 52017, and # 52018, and all of the functions on one light are not working then it sounds like the problem is the light itself. If some of the functions worked on the light then I would say that you have a problem with the wiring somewhere. You can test the light by running a ground to the marked pin and then test the other 2 pins with a 12V power source. If you think that the wiring may be an issue...
    view full answer...

  • Is 2004 Subaru Forester Trailer Wiring Harness Strong Enough for Yakima Rack and Roller Trailer
  • If your Yakima Rack and Roll trailer was made after October 2010 then that would mean it has LED lights on it. LED lights draw very little power compared to incandescent lights and using them and 2 additional lights are well within the abilities of the trailer wiring harness on your 2004 Subaru Forester Turbo. Even if the lights were not LED, the lights on older versions of the Rack and Roll trailers would likely not be enough power draw to be a problem, even considering adding 2 more...
    view full answer...

  • Availability of Mounting Bracket for 2-1/2 Diameter Round Sealed Trailer Lights
  • We do indeed have a bracket designed for 2-1/2 inch diameter trailer lights, part # BK55BB. You would also need the rubber grommet, part # A57GB. The bracket and grommet would work with a 2-1/2 inch diameter lamps like part # MC57RB or # MC57AB.
    view full answer...

  • How Does Trailer Light # ST45RB Mount into Mounting Bracket # BK45BB
  • I went out to the warehouse and pulled Optronics Trailer Light, # ST45RB. First, you will need to place the Rubber Grommet, # A45GB, into the mounting bracket, # BK45BB. Next, you will need to press the light until it is seated all the way in the bracket. This last step actually takes some strength as the light is held in place by the grommet. I had to use some lubricate to get the light to seat all the way in the mounting bracket. Once in place, the light will not come out unless it is...
    view full answer...

  • Will Optronics Submersible Trailer Light ST6RB Work on Malone Kayak Trailer
  • The Submersible Trailer Stop, Turn, and Tail Light # ST6RB that you referenced is a great choice to replace the existing lights on your Malone Kayak Trailer. The light housing is designed to allow water to flow in and back out of the housing while being submerged. This light has 6 functions: stop, turn, tail, rear reflex, side marker, and side reflex, and will mount on studs with 2 inch centers. For the left-hand version of this light you will want # ST7RB. For a similarly sized light...
    view full answer...

  • Availability of 2 Inch Diameter 3-Function Taillight
  • There is not a 3 function lamp available that has a 2 inch diameter. DOT regulations require that tail lamps meet certain size and visibility requirements. Clearance/marker lights can be smaller, but a 2 inch diameter taillight would not meet those requirements. There is a 4 inch diameter lamp, part # ST45RB. The lamp would typically mount in a grommet like part # A45GB set into an existing hole or using a bracket like # BK45BB.
    view full answer...

  • Optronics GLOLight LED Stop/Turn/Tail Light Availability
  • We do carry the GLOLight # STL101RMB as well as several other GLOLight products. I have attached link for the GLOLight product page. This unit has a four inch diameter; for installation you will also need to order the following: Three-Wire Pigtail part # AL45PWTB; Rubber Grommet part # A45GB; and the Mounting Bracket part # BK45BB. I attached a short video of the GLOLight # STL101RB, which is the same base part as the one you reference, however, the video is demonstrating the part...
    view full answer...

  • 24 Volt Trailer Light Availability
  • We have a few 24 volt compatible lights but not the part # TLL9RK. I recommend using light # STL23R24B. There are a few ways to mount this light. You can use a grommet and flush mount it using # A45GB. Or you can surface mount it with a bracket, # BK45BB. You will also use a wiring harness, # A47PB.
    view full answer...

  • Availability of 24-Volt Tail Lights for Lowboy Trailer
  • We do have some trailer tail lights designed to work on a 24-volt system. I recommend using light # STL23R24B. There are a few ways to mount this light. You can use a grommet and flush mount it in a 4-1/2 inch cutout using # A45GB. Or you can surface mount it with a bracket, # BK45BB. You will also use a wiring harness, # A47PB. These parts only come in red.
    view full answer...

  • How to Convert a 4-way into a 7-way for Backup Lights on a Boat Trailer
  • There are three things that you will need to do to add reverse lights to your boat trailer. The first thing you will need to do is add a 7-way connection on your trailer. You can either use the Epicord 7-way # 277-000141 with the junction box, or you could go with the Pollack 7-way Connector # PK12706. The big difference between these two is that with the Epicord you will make all of your wiring connections inside the junction box, but you need to keep the junction box in a safe place,...
    view full answer...

  • Functions of Optronics 12 Diode Miro-Flex Tail Light # STL23RB
  • The Optronics 12 Diode Miro-Flex LED Trailer Stop/Turn/Tail Light you referenced, part # STL23RB is a three function lamp. The # A47PB right angle pigtail, which is sold separately, has a white ground wire, a red wire that carries the brake and directional signal and a black wire that serves as the running light circuit. If the vehicle headlights were turned on, the lamp would be lit. Applying the brakes would make the lamp brighter. The lamp has several mounting options. It can...
    view full answer...

  • Trailer Lights for 12 Volt and 24 Volt Systems on a 1994 Mercedes G Wagon and Honda CR-V
  • Some trailer lights can be used on either a 12 volt or 24 volt system, but # STL16RB is not one of them. You could use # STL23R24B with harness # A47PB, grommet # A45GB, bracket # BK45BB for a 24/12 volt system and it would work with both vehicles.
    view full answer...

  • Trailer Light And Mounting Bracket Recommendation
  • The Optronics light, part # STL42RB, you are asking about uses the mounting holes in the included flange for mounting. This light features 10 Super LED lights and has a sealed, waterproof housing and lens kit. The mounting holes in the flange are spaced 4-1/4 inches apart center-to-center. We do have a mounting bracket, part # BK45BB, for a 4 inch light but the mounting holes are spaced 4 inches center-to-center. If you wished to drill the holes in the bracket to match the holes in the...
    view full answer...

  • Can the Optronics Sealed, Miro-Flex Trailer Clearance Trailer Light Be Used as a Brake Light
  • The 3 diodes in the Miro-flex light, # MCL51RB, would not make a very good brake light. They would not be as bright as the regular brake lights already on the trailer. You would need a light designed to function in whole or in part as a brake light such as # STL23R24B. With this light you would also need a wiring harness, # A47PB. To mount it you could use mounting bracket, # BK45BB and grommet # A45GB. You could also flush mount it using the mounting flange # A45BB.
    view full answer...

  • Trailer Light Mounting Bracket
  • The mounting bracket in the picture you submitted looks very similar to # BK45BB. This bracket is for a 4-1/2 inch round trailer light and is 6 inches long, 5-13/16 inches wide and 1-3/8 inches deep. The base mounting holes are spaced 4 inches apart.
    view full answer...


Do you have a question about this Accessories and Part?




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Info for this part was:

Expert Research:
Michael L
Expert Research:
Michael H
Expert Research:
Jameson C
Updated by:
Laura H
Photos by:
Jim W
Updated by:
Brian T

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