Ronno6
Full Access Member
- Joined
- May 14, 2018
- Posts
- 438
- Reaction score
- 126
- Location
- South Mississippi
- First Name
- Ron
- Truck Year
- 1984
- Truck Model
- C10
- Engine Size
- 355
What Are They??
- Thread starter Ronno6
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
Originalthor
Full Access Member
- Joined
- Aug 22, 2021
- Posts
- 1,088
- Reaction score
- 3,668
- Location
- Saskatoon Saskatchewan
- First Name
- Scott
- Truck Year
- 1989
- Truck Model
- Suburban
- Engine Size
- 5.7
Your bed bolts should go through those.
Ronno6
Full Access Member
- Joined
- May 14, 2018
- Posts
- 438
- Reaction score
- 126
- Location
- South Mississippi
- First Name
- Ron
- Truck Year
- 1984
- Truck Model
- C10
- Engine Size
- 355
By golly........ I thought there were only 6........
Okee dokee.
Now, why the eccentric square holewashers for the bed mounting carriage bolts???
Okee dokee.
Now, why the eccentric square holewashers for the bed mounting carriage bolts???
Lugnut
Full Access Member
- Joined
- Jan 24, 2013
- Posts
- 226
- Reaction score
- 696
- Location
- Northwest Georgia
- First Name
- Jason
- Truck Year
- 1979, 1986
- Truck Model
- K20, C10
- Engine Size
- '79) 350/ granny 4-speed, '86) 350/A833 3-speed with overdrive
Bed adjustment.
- Joined
- Aug 3, 2010
- Posts
- 30,611
- Reaction score
- 28,840
- Location
- Usually not in Ohio
- First Name
- Andy
- Truck Year
- '77, '78, '79, '84, '88
- Truck Model
- K5 thru K30
- Engine Size
- 350-454
The eccentric washers help keep the bolt from spinning, as soon as the washer sinks down in the wood some.
squaredeal91
Full Access Member
- Joined
- Mar 10, 2023
- Posts
- 2,589
- Reaction score
- 4,714
- Location
- Cave junction Oregon
- First Name
- Greg bush
- Truck Year
- 1991 SB
- Truck Model
- K30
- Engine Size
- 5.9 Cummins 12 valve
Good to know. I'll be restoring my stepside bed to go back on my 78k at some point.
Ronno6
Full Access Member
- Joined
- May 14, 2018
- Posts
- 438
- Reaction score
- 126
- Location
- South Mississippi
- First Name
- Ron
- Truck Year
- 1984
- Truck Model
- C10
- Engine Size
- 355
One might suppose that, but the round holes in the bed cross members and the truck frame wouldn't permit much adjustment...........The bolt turning prevention seems like a plausible explanation......
Keith Seymore
Full Access Member
- Joined
- Jul 13, 2015
- Posts
- 2,971
- Reaction score
- 9,611
- Location
- Motor City
- First Name
- Keith Seymore
- Truck Year
- 1987
- Truck Model
- R10
- Engine Size
- 4.3L
Bolt turning prevention is correct.
K
K
Bennyt
Full Access Member
- Joined
- May 17, 2019
- Posts
- 1,222
- Reaction score
- 1,927
- Location
- Surprise
- First Name
- Ben
- Truck Year
- 1977
- Truck Model
- C10
- Engine Size
- 350
Just an FYI...if you are going the custom route, you can either weld nuts inside or install the bolts before the wood and then you won't see them. I did that as well as used the hidden fastener strips on my son's wood floor fleetside and it cleaned up the look.
You must be registered for see images attach
Last edited:
Ronno6
Full Access Member
- Joined
- May 14, 2018
- Posts
- 438
- Reaction score
- 126
- Location
- South Mississippi
- First Name
- Ron
- Truck Year
- 1984
- Truck Model
- C10
- Engine Size
- 355
Now, the next question.......
My bed had steel sleeves/spacers on the remaining 6 1/2" carriage bolts.
I would think these were OEM, but LMC doesn't show them in their catalog.....
They are a pretty close fit to the square neck on the carriage bolts.
Should they be a tad shorter than the thickness of the bed lumber?
Gotta allow the bolts to get tight, but hopefully wood shrinkage over time won't
allow slop.......
My bed had steel sleeves/spacers on the remaining 6 1/2" carriage bolts.
I would think these were OEM, but LMC doesn't show them in their catalog.....
They are a pretty close fit to the square neck on the carriage bolts.
Should they be a tad shorter than the thickness of the bed lumber?
Gotta allow the bolts to get tight, but hopefully wood shrinkage over time won't
allow slop.......
79K10Step
Junior Member
- Joined
- Sep 24, 2022
- Posts
- 25
- Reaction score
- 15
- Location
- TN
- First Name
- Bert
- Truck Year
- 1979
- Truck Model
- K10
- Engine Size
- 350
What I did on mine was get a forstner bit the same diameter as the washers with square holes and counter sink them 1'16th to 1/8th inch so the washers will not spin. If you notice the square hole is not dead center but offset which makes spinning impossible when counter sunk. There are some instructions online (Mar-K has these instructions). Mine also had a couple of 10 1/2 inch bolts that mount through the frame.
