Hole Size Needed to Install the Optronics Sealed 4 Inch Round Trailer Light # ST47RB

Question

Question:

What size hole do I need to cut to mount a ST47RB light?

asked by: Jason

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Expert Reply:

I pulled the Optronics Sealed 4 Inch Round Trailer Light, # ST47RB, from the warehouse and measured the diameter of the light housing that will be recessed in the trailer. It measures 4.44 inches in diameter so a 4-1/2 inch hole should be fine.

I spoke with my contact at Optronics and they do not recommend a specific hole diameter for this light, but most flange and flush mounted 4 inch lights require a 4-1/2 inch diameter hole.

expert reply by: John H

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Answer 1

The closest to 4 inch round lights we have is the Optronics LED Trailer Utility Light #BUL43CB or Trailer tail Light #STL55RB which are actually 4-5/16" diameter x 1-15/16" thick. These are designed to fit the Rubber Grommet for 4"…

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Answer 2

The Demco Kar Kaddy SS Tow Dolly with Disc Brakes - Foldable - 4,800 pounds #DM9713045 is currently the only steerable dolly that we have. The steerable axle allows for tight cornering and easy maneuvering, it tracks directly behind your motorhome.…

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Answer 3

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 4

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Answer 5

Load range B trailer tires are going to have a lower capacity than C load range tires. Basically that, psi rating, and the ply rating are the only differences. A higher load range tire would last a little longer than lower load ranges of the same…

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Answer 6

The three most common lug stud sizes for a trailer are 1/2"-20, 9/16"-18, and 5/8"-18. In order to make sure you get the correct lug nuts you need to measure the lug studs on the trailer now as we have no way to look this up for…

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Answer 7

The two sizes you mentioned are pretty similar and fit many of the same 15 inch wheels. The 205/75-15 fits rim widths of 5 inch to 6-1/2 inch whereas the 225/75-15 fits widths that are 5 inch to 6 inch. The 205 is 27.1 inches tall and the 225 is 28.4…

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Answer 8

Your math is correct in your trailer weight load example. If a fully-loaded tandem axle trailer weighs 4000-lbs then each of the 4 tires will bear 1/4th of that load, or 1000-lbs. In this case a tire rated for 1300-lbs would provide a good safety…

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Answer 9

You can add larger wheels and tires to a trailer as long as you have enough room for the larger size. The main clearance issues we find when putting larger tires and wheels on a trailer is from the top of the tire to the fender and from the inside…

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Answer 10

Good morning, Cliff. As of today (3/27/24) we are expecting the #KE33JR tire/wheel combo to be in stock in about 2 weeks. Hopefully this means we can take our own pictures and put them on the site within maybe about 3-4 weeks from now. What I can…

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Answer 11

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 12

A BT8 spindle would have a diameter of .99 of an inch where the bearings would both install and would have a diameter of 1.24 where the great seal would ride. That would require a hub part #AKIHUB-440-2-1K for an idler hub. A BTR spindle would have…

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Hole Size Needed to Install the Optronics Sealed 4 Inch Round Trailer Light # ST47RB

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