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Old 03-31-2016, 11:43 AM   #1
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Tow Bar Attachment

I'm in installing yet another set of baseplates, and again am amazed that there are 8 3/8 inch grade 5 bolts to hold the base plate and the class 3 receiver hitch welded to my motor home. All this sounds very secure. Now we connect the tow bar to the motor home with 1 3/4 inch pin. which part of this is over engineered? Or am I missing something?
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Old 03-31-2016, 12:58 PM   #2
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Originally Posted by johnboy2 View Post
I'm in installing yet another set of baseplates, and again am amazed that there are 8 3/8 inch grade 5 bolts to hold the base plate and the class 3 receiver hitch welded to my motor home. All this sounds very secure. Now we connect the tow bar to the motor home with 1 3/4 inch pin. which part of this is over engineered? Or am I missing something?
johnboy2
Methinks you measured wrong.... (a 5/8 inch diameter hitch pin is used to connect a tow bar to the class III receiver hitch on most motor homes).
Mel
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Old 03-31-2016, 01:02 PM   #3
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I'm in installing yet another set of baseplates, and again am amazed that there are 8 3/8 inch grade 5 bolts to hold the base plate and the class 3 receiver hitch welded to my motor home. All this sounds very secure. Now we connect the tow bar to the motor home with 1 3/4 inch pin. which part of this is over engineered? Or am I missing something?
It's all in the metallurgy and in the difference between compression and shear forces. You're not missing anything.
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Old 03-31-2016, 02:20 PM   #4
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I know about shear all the baseplate bolts are in shear as is the pin there for the base plates must have a huge CYA safety margin. 3/8 gd 5 8200 lb shear
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Old 03-31-2016, 02:34 PM   #5
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JohnBoy2,
You know why my baseplate is held on with 8x grade 8 bolts? Cause they don't make a grade 9 bolt. Now I'm all worried about my one hitch pin.....thanks ~~~:{
(I hate smart people)
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Old 04-03-2016, 11:33 AM   #6
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Threw away all the Grade 5 junk fasteners that came with my baseplate and used Grade 8 with hardened flat washers instead of the split lockwashers. Doubled the integrity of the joints. Split lockwashers were proven to be worse than useless back in the 70's.
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Old 04-03-2016, 12:46 PM   #7
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All your grade 8 upgrades you could even weld It are still being held to the coach with 1 pin. holding the tow bar to the coach. what grade is that pin?
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Old 04-03-2016, 08:10 PM   #8
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Grade 8 bolts are not necessarily better than grade 5 bolts. The higher the grade, the harder the bolt but that also means it is more brittle and more prone to break instead of bending. Bolt grades are recommended for a reason.
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Old 04-03-2016, 08:17 PM   #9
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If you follow the directions for installation regarding hole size, torque etc you shouldn't waste your time worrying.

The design engineers probably spent many a restless night wondering what they missed, overlooked or took for granted. The liability associated with these products is huge so I'll guarantee that they are designed to exceed the requirements.

I'd say the even take into account the installation knowing that some people don't know what they are doing. They could have probably gotten by with 4 bolts but doubled it for the "You can't fix stupid" factor.
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Old 04-03-2016, 08:23 PM   #10
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If you follow the directions for installation regarding hole size, torque etc you shouldn't waste your time worrying.

The design engineers probably spent many a restless night wondering what they missed, overlooked or took for granted. The liability associated with these products is huge so I'll guarantee that they are designed to exceed the requirements.

I'd say the even take into account the installation knowing that some people don't know what they are doing. They could have probably gotten by with 4 bolts but doubled it for the "You can't fix stupid" factor.

Agree. I would install per the directions rather than second guessing the design engineering that went into it.
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Old 04-03-2016, 08:30 PM   #11
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JohnBoy2,
You know why my baseplate is held on with 8x grade 8 bolts? Cause they don't make a grade 9 bolt. Now I'm all worried about my one hitch pin.....thanks ~~~:{
(I hate smart people)
Ah, but they do.
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Old 04-03-2016, 08:32 PM   #12
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I'm in installing yet another set of baseplates, and again am amazed that there are 8 3/8 inch grade 5 bolts to hold the base plate and the class 3 receiver hitch welded to my motor home. All this sounds very secure. Now we connect the tow bar to the motor home with 1 3/4 inch pin. which part of this is over engineered? Or am I missing something?
What is the gauge of the steel the base plate bolts to. Pretty thin, I would think.

If it was as thick as the hitch, it would have 2 bolts.
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Old 04-04-2016, 07:06 PM   #13
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Now that makes sense, the thin car frame.

Thanks John
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Old 04-04-2016, 07:30 PM   #14
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I used factory supplied bolts for all of my base plates....they all out lasted the tow bar.....it snapped in half.
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