Should Demco Surge Actuator DM8104002 be Welded or Bolted On

Question

Question:

What size bolts and nuts are recommended for the mounting for the actuator DM8104002. my trailer tongue is 3 inches wide. Thanks

asked by: Warren

0

Expert Reply:

Hey Warren, so we don't have a recommended size of hardware to use with the Demco Coupler part # DM8104002. This is technically a weld on actuator so your best option would be to have a welder install it.

expert reply by: Jameson C

0

Jameson C.

12/15/2025

Hey Warren, were you able to have the Demco actuator welded onto your trailer tongue? Knowing how the weld turned out could help others planning a similar setup.

Answer 1

I went out and measured the actuator #DM8104002 across the top and it's exactly 4 inches like what you're looking for. It's designed to be welded to 3 inch wide trailer tongues.

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Answer 2

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Answer 3

The Replacement Master Cylinder #DM5918 can be installed on your Demco DA66B surge brake actuator to convert it to work with disc brakes. This includes an electric lockout actuator to prevent the brakes from actuating in reverse.

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Answer 4

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 5

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 6

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Answer 7

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 8

The Demco Hydraulic Trailer Brake Actuator part #DM72VR should be a direct replacement for the Atwood 61101 Brake Actuator that you have now. This newest updated it rated at 7K instead of 6K. This is a bolt on option that mounts on 3" centers.…

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Answer 9

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Answer 10

Hi Paul, you’re definitely on the right track here, and I can help you narrow this down with confidence. With your tandem 3,500 lb Dexter axles and 33 inch spacing, both the Dexter EZ Flex part #K71-652-00 and the Lippert Road Armor part #LC53CK are…

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Answer 11

The manual lockout on your Atwood 85778 surge brake coupler is there so that you can back up the trailer without the brakes locking up on you. Yes you can safely tow your trailer with the broken manual lockout, you just have to make sure you…

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Answer 12

The #84 spindle is just a common way to identify the spindle dimensions typically used for 3,500 lb axles. So instead of listing out the parts, people can just say they have #84 spindles and it's easier to know what fits it. The CE Smith Trailer…

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Should Demco Surge Actuator DM8104002 be Welded or Bolted On

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