|
|
04-30-2018, 08:22 PM
|
#1
|
Senior Member
Brand: DRV
State: Texas
Posts: 678
THOR #3109
|
Bolt strength on pin box
In looking at the Morryde pin box on my RSSA--the load ratings list:
5 grade 8 bolts/side = 21000lbs
6 grade 8 bolts/side = 24000lbs
Interestingly, all 12 bolts on my Suites are grade 5....
I'm sure there is plenty of bolt strength with the 5s, just seems odd that MR or Lippert puts a rating for G8 and then installs G5.
Joe
__________________
2016 Tiffin 40QBH
2015 38RSSA--traded
2005 36TK3--retired, but it was a good one
2017 F450 KR
|
|
|
05-01-2018, 01:31 AM
|
#2
|
Junior Member
Brand: DRV
Model: 38 RSSA
State: Tennessee
Posts: 10
THOR #2122
|
Interesting
Mine are grade 8 bolts.
__________________
2016 Moble Suites 38RSSA
2016 Ford F-350
|
|
|
05-01-2018, 02:31 AM
|
#3
|
Senior Member
Brand: DRV
State: Texas
Posts: 678
THOR #3109
|
That's why I am wondering....thanks.
__________________
2016 Tiffin 40QBH
2015 38RSSA--traded
2005 36TK3--retired, but it was a good one
2017 F450 KR
|
|
|
05-01-2018, 06:38 AM
|
#4
|
Senior Member
Brand: DRV
Model: 38 RSB3
State: South Dakota
Posts: 2,280
THOR #1658
|
Quote:
Originally Posted by wingnut60
In looking at the Morryde pin box on my RSSA--the load ratings list:
5 grade 8 bolts/side = 21000lbs
6 grade 8 bolts/side = 24000lbs
Interestingly, all 12 bolts on my Suites are grade 5....
I'm sure there is plenty of bolt strength with the 5s, just seems odd that MR or Lippert puts a rating for G8 and then installs G5.
Joe
|
Thanks Joe.... Another thing I need to look at.
__________________
2016 DRV38RSB3
2015 Ram 3500 Regular Cab DRW CTD Asian trans 410 rear
|
|
|
05-01-2018, 01:46 PM
|
#5
|
Senior Member
Brand: DRV
Model: 39TKSB3 "Modified"
State: South Dakota
Posts: 1,837
THOR #1661
|
I changed mine out to 3/4" frame bolts but the top two I replaced with 5/8" frame bolts.
The holes are actually punched at 11/16" so my pinbox actually tipped up on my first outing.
I would change them out to grade 8 for sure!!! Also fill ALL the holes.
__________________
|
|
|
05-01-2018, 01:57 PM
|
#6
|
Senior Member
Brand: DRV
Model: 41RSSB4
State: South Dakota
Posts: 313
THOR #5859
|
Quote:
Originally Posted by wingnut60
In looking at the Morryde pin box on my RSSA--the load ratings list:
5 grade 8 bolts/side = 21000lbs
6 grade 8 bolts/side = 24000lbs
Interestingly, all 12 bolts on my Suites are grade 5....
I'm sure there is plenty of bolt strength with the 5s, just seems odd that MR or Lippert puts a rating for G8 and then installs G5.
Joe
|
Your GVWR is 21K. Are you planning to overload your rig?
If the rig had a 24K weight rating I would then expect to see the G8 bolts.
__________________
George
Kerrville, Tx
2015 Mobile Suites 41RSSB4
2011 F350 Dually 6.7 PSD
|
|
|
05-01-2018, 03:45 PM
|
#7
|
Member
Brand: DRV
State: South Dakota
Posts: 49
THOR #4314
|
Got grade 8 bolts and pin box is riding on the 5 bolt pattern. Came from the factory at the 6 bolt pattern but I lowered the pin box to get more bed rail clearance. All appears to be working fine on the 5 bolts pattern.
__________________
|
|
|
05-01-2018, 09:17 PM
|
#8
|
Senior Member
Brand: DRV
Model: 36RSSB3
State: Texas
Posts: 215
THOR #88
|
I just checked ours and it has 5 grade 8 bolts on each side.
__________________
2017 Chevy 3500 DRW 4X4 CC LWB D/A
2016 Mobile Suites 36RSSB3
Comfort Ride 245 Hitch
|
|
|
05-03-2018, 03:02 PM
|
#9
|
Senior Member
Brand: DRV
Model: 41RSSB4
State: South Dakota
Posts: 313
THOR #5859
|
How do I tell what grade of bolts I have, anyway?
__________________
George
Kerrville, Tx
2015 Mobile Suites 41RSSB4
2011 F350 Dually 6.7 PSD
|
|
|
05-03-2018, 03:23 PM
|
#10
|
Member
Brand: DRV
State: South Dakota
Posts: 49
THOR #4314
|
Look ahead the head of the bolt. If it has 3 hash lines they are grade 5, if it has 6 hash lines they are grade 8.
__________________
|
|
|
05-03-2018, 10:09 PM
|
#11
|
Senior Member
Brand: DRV
State: Texas
Posts: 678
THOR #3109
|
Take a look at Cummins' pic--there are 6 hash marks around the bolt head. If you have 6 hash/diagonal marks, you have G8.
__________________
2016 Tiffin 40QBH
2015 38RSSA--traded
2005 36TK3--retired, but it was a good one
2017 F450 KR
|
|
|
05-03-2018, 10:10 PM
|
#12
|
Senior Member
Brand: DRV
State: Texas
Posts: 678
THOR #3109
|
Fulltimer50,
Wondering how you arrived at my GVWR?
__________________
2016 Tiffin 40QBH
2015 38RSSA--traded
2005 36TK3--retired, but it was a good one
2017 F450 KR
|
|
|
05-04-2018, 02:36 AM
|
#13
|
Senior Member
Brand: DRV
Model: Memphis
State: South Dakota
Posts: 181
THOR #2341
|
Not using the engineering standard here. But in some circumstances, using a lesser grade bolt can allow for the bolt to bend before it shears. The Grade 8 steel is a harder material at the molecular level and will shear without warning. The Grade 5 will bend giving an obvious sign of overload before shear.
Used this method during some racing days.
__________________
A&J
2017 Mobile Suite Memphis
|
|
|
05-04-2018, 02:48 AM
|
#14
|
Senior Member
Brand: DRV
State: Texas
Posts: 678
THOR #3109
|
Appreciate all the info, but my original thought was: Why have info on the pin box for G8 bolts when the bolts themselves are G5? Wrong tag? Wrong bolts? Inquiring minds want to know...
Have yet to hear of any bolt failures on any fivers on the forums over the last 10 or so years, so I believe my 12 G5 bolts are fine. Working up to eliminating the flange on the outer plate on my pin box for clearance purposes.
__________________
2016 Tiffin 40QBH
2015 38RSSA--traded
2005 36TK3--retired, but it was a good one
2017 F450 KR
|
|
|
05-04-2018, 12:26 PM
|
#15
|
Senior Member
Brand: DRV
Model: 41RSSB4
State: South Dakota
Posts: 313
THOR #5859
|
Quote:
Originally Posted by wingnut60
Fulltimer50,
Wondering how you arrived at my GVWR?
|
I asked Google. But I see now that is for an Estates.
https://www.whiskeymountainrv.com/pr...slide-722468-5
__________________
George
Kerrville, Tx
2015 Mobile Suites 41RSSB4
2011 F350 Dually 6.7 PSD
|
|
|
05-04-2018, 01:12 PM
|
#16
|
Senior Member
Brand: DRV
Model: 41RSSB4
State: South Dakota
Posts: 313
THOR #5859
|
Quote:
Originally Posted by wingnut60
In looking at the Morryde pin box on my RSSA--the load ratings list:
5 grade 8 bolts/side = 21000lbs
6 grade 8 bolts/side = 24000lbs
Interestingly, all 12 bolts on my Suites are grade 5....
I'm sure there is plenty of bolt strength with the 5s, just seems odd that MR or Lippert puts a rating for G8 and then installs G5.
Joe
|
I went back to your original post, as well as looked at mine, a 19k GVWR rig. I have 12 g8 bolts.
My interpretation of the tag is: Morryde gives the specs for the number and grade of the mounting bolts. Some may have only 5 bolts some have 6, But they should always be grade 8 bolts. Whoever did the install used the wrong bolts. BUT the tag is also suspect. How can you install using only 5 bolts? They must mean 5 or 6 per side, but thats not what it says.
__________________
George
Kerrville, Tx
2015 Mobile Suites 41RSSB4
2011 F350 Dually 6.7 PSD
|
|
|
05-04-2018, 02:32 PM
|
#17
|
Senior Member
Brand: DRV
State: Texas
Posts: 678
THOR #3109
|
Thanks for making the effort to help--Google is good, but doubt the exactness as you found out.
My RSSA also has a 19k GVWR--which in itself is a concern. I bought it used and am just doing research into various aspects of the suspension and such. My current concern is the clearance on the pin box-to-bed side of my 450, as the trailer does not have the risers. Good clearance so far, but was in an oddly shaped/leveled site recently which brought up the contact concern and have asked some welders about removal of the flange--people who know metal (but not engineers) all say the flange is unneeded, if in fact the entire plate is needed at all with the large washers in use. It is my intent to remove the side plate and have a new one fabbed out of slightly thicker steel plate and without the flange.
Thanks,
Joe
__________________
2016 Tiffin 40QBH
2015 38RSSA--traded
2005 36TK3--retired, but it was a good one
2017 F450 KR
|
|
|
05-04-2018, 02:35 PM
|
#18
|
Member
Brand: DRV
Model: 36TK3
State: California
Posts: 64
THOR #2059
|
Quote:
Originally Posted by wingnut60
Appreciate all the info, but my original thought was: Why have info on the pin box for G8 bolts when the bolts themselves are G5? Wrong tag? Wrong bolts? Inquiring minds want to know...
Have yet to hear of any bolt failures on any fivers on the forums over the last 10 or so years, so I believe my 12 G5 bolts are fine. Working up to eliminating the flange on the outer plate on my pin box for clearance purposes.
|
I've been coast to coast several times with 5 grade 5 bolts per side. No plan to change unless I have another reason for bolt removal. Each 3/4 inch Gr5 bolt has a clamp load of over 21,000#. 10 total 3/4 Gr5 bolts are way more than sufficient.
__________________
2007 MS 36 TK3, Demco Glide Ride
2012 GMC 3500HD D/A CC, AirSafe Hitch
|
|
|
05-04-2018, 02:46 PM
|
#19
|
Senior Member
Brand: DRV
State: Texas
Posts: 678
THOR #3109
|
anijet,
I looked up the strength of the bolts, and no, not worried about them. Just odd that the label addresses G8 and has G5 installed.
Like a lot of guys, I may overthink some stuff, but the GVWR is low for this trailer vs similar DRV models--the actual 'dry' weight on my trailer is 18300 with a 19000 GVWR, not logical.
__________________
2016 Tiffin 40QBH
2015 38RSSA--traded
2005 36TK3--retired, but it was a good one
2017 F450 KR
|
|
|
05-04-2018, 03:36 PM
|
#20
|
Senior Member
Brand: DRV
Model: 39TKSB3 "Modified"
State: South Dakota
Posts: 1,837
THOR #1661
|
Quote:
Originally Posted by wingnut60
Appreciate all the info, but my original thought was: Why have info on the pin box for G8 bolts when the bolts themselves are G5? Wrong tag? Wrong bolts? Inquiring minds want to know...
Have yet to hear of any bolt failures on any fivers on the forums over the last 10 or so years, so I believe my 12 G5 bolts are fine. Working up to eliminating the flange on the outer plate on my pin box for clearance purposes.
|
WRONG bolts!!! I WOULD change them out!
__________________
|
|
|
|
|
Thread Tools |
|
Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
|