Old forum Archive
This is where all the topics from the old forum that was shutdown are saved in a read-only forum. You can refer to it on this forum by using a link or copying the data over.
http://archive.aluminiumcamperforum.com/

Author Topic: I'd like to change me trailer hitch coupler.  (Read 4002 times)

Merlin

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 1027
  • Karma: +16/-0
    • TV and RV:
      2017 Land Cruiser

    • 2015 Camplite 16TBS
    • View Profile
Re: I'd like to change me trailer hitch coupler.
« Reply #30 on: April 29, 2020, 09:09:19 PM »
@charliem is the side bolt guru. We’ll see if he remembers  ;)
Michigan

charliem

  • Sr. Member
  • ****
  • Posts: 266
  • Karma: +5/-0
  • Hello from Beautiful Colorado
    • TV and RV:
      Tacoma, E2 WDH, P3

    • 2014 21RBS
    • View Profile
Re: I'd like to change me trailer hitch coupler.
« Reply #31 on: April 29, 2020, 10:09:11 PM »
From my original posts: "I considered stainless bolts, but went with ½” dia. 13 TPI Grade 8 high strength bolts so I could torque them to 80 ft-lbs. Six ½” x 0.1’ thick washers were added to each side to make a tight stack when torqued. The side bolts were drilled 2.25” up from the bottom of the frame and 1” in from the front edge of the frame. I used 2” long bolts with flat and lock washers." Stainless is tempting but they are not as strong as HS steel bolts.
[/font]
Any 20 minute job can be stretched to a week with proper planning

Charlie
Northern Colorado
2014 21RBS
2013 Tacoma supercharged 4.0L V6
E2 WDH, P3 controller

DavidM

  • Sr. Member
  • ****
  • Posts: 496
  • Karma: +17/-1
    • TV and RV:
      2013 Nissan Pathfind

    • Camplite 16 TBS
    • View Profile
Re: I'd like to change me trailer hitch coupler.
« Reply #32 on: April 30, 2020, 11:59:07 AM »
It is sort of a compromise between availability, corrosion resistance and strength as to which bolts you use. I recently went looking for 1/2" Grade 8 bolts for a similar project, the ones Charlie used, and couldn't find them at an auto parts or a hardware store. So I used Grade 5 which is about 120,000 psi tensile strength vs 150,000 for Grade 8.

I think either would be fine for this application.

David


Merlin

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 1027
  • Karma: +16/-0
    • TV and RV:
      2017 Land Cruiser

    • 2015 Camplite 16TBS
    • View Profile
Re: I'd like to change me trailer hitch coupler.
« Reply #33 on: April 30, 2020, 12:43:57 PM »
I assume Charlie's frame is a 2X4 and the 13 is probably a 2X3. That likely means the hole will be less than 2.25" from the bottom on the frame on the 13. Be sure to look inside the frame under the coupler to make sure clearances are ok for the chosen hole location. I drilled hole for my bolts (2X3 frame) in the center of the frame about an inch from the end.
Michigan

Sylvain

  • Full Member
  • ***
  • Posts: 143
  • Karma: +0/-0
    • TV and RV:
      2015 Silverado

    • 2013 13QBB
    • View Profile
Re: I'd like to change me trailer hitch coupler.
« Reply #34 on: April 30, 2020, 07:05:12 PM »
Thanks a lot guys!  Once again lots of great information here.  I noticed on Charlie's photos that he had to add a few washers between the coupler and the frame to fill the space.  I may not have to do that since our coupler seems to sit perfectly againts the frame.

charliem

  • Sr. Member
  • ****
  • Posts: 266
  • Karma: +5/-0
  • Hello from Beautiful Colorado
    • TV and RV:
      Tacoma, E2 WDH, P3

    • 2014 21RBS
    • View Profile
Re: I'd like to change me trailer hitch coupler.
« Reply #35 on: April 30, 2020, 11:59:45 PM »
Fewer washers are better. Just be sure any gap is filled. As for grade 8 vs grade 5 I think you would be ok with the fives on a 13. I really didn't run calcs to decide on the grade 8s. My engineering brain just said more is better and the hitch had been a high stress problem for me in more ways than one. Grade 5 bolts will require a lower torque value.
« Last Edit: May 01, 2020, 12:05:17 AM by charliem »
Any 20 minute job can be stretched to a week with proper planning

Charlie
Northern Colorado
2014 21RBS
2013 Tacoma supercharged 4.0L V6
E2 WDH, P3 controller

Sylvain

  • Full Member
  • ***
  • Posts: 143
  • Karma: +0/-0
    • TV and RV:
      2015 Silverado

    • 2013 13QBB
    • View Profile
Re: I'd like to change me trailer hitch coupler.
« Reply #36 on: May 01, 2020, 10:31:56 AM »
Ok, thanks again for the valuable information Charlie.

ADR

  • Full Member
  • ***
  • Posts: 212
  • Karma: +0/-0
    • TV and RV:
      18Transit/19 4Runner

    • 2018 16TBS
    • View Profile
Re: I'd like to change me trailer hitch coupler.
« Reply #37 on: May 06, 2020, 09:00:10 PM »
It is sort of a compromise between availability, corrosion resistance and strength as to which bolts you use. I recently went looking for 1/2" Grade 8 bolts for a similar project, the ones Charlie used, and couldn't find them at an auto parts or a hardware store. So I used Grade 5 which is about 120,000 psi tensile strength vs 150,000 for Grade 8.

I think either would be fine for this application.

David

Do you have the Tractor Supply stores- they have them- sold by the pound.    Grade 5 and 2 also.

Sylvain

  • Full Member
  • ***
  • Posts: 143
  • Karma: +0/-0
    • TV and RV:
      2015 Silverado

    • 2013 13QBB
    • View Profile
Re: I'd like to change me trailer hitch coupler.
« Reply #38 on: May 07, 2020, 09:32:11 PM »
Tractor supply store. Ok, that's another option.