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Offset washers #1305472
Sun Mar 31 2019 09:06 PM
Sun Mar 31 2019 09:06 PM
A
Apache1  Offline OP
Shop Shark
Joined: Dec 2018
Posts: 298
Whitwell, TN
Why did GM opt to use this type of washer when securing the bed planks? What exactly is the purpose and how do they relate to the underside crossmembers? Is an offset countersink and special tool required?

Last edited by Apache1; Sun Mar 31 2019 09:07 PM.

1959 Apache 3100 Fleetside SWB Resto-Mod



Re: Offset washers [Re: Apache1] #1305474
Sun Mar 31 2019 09:30 PM
Sun Mar 31 2019 09:30 PM
Hambone  Offline
Shop Shark
Joined: May 2007
Posts: 1,261
california, md
My guess is to stop the washer from spinning when tighening the nut. All other bolt holes are square to shoulder the bolt.

Last edited by Hambone; Sun Mar 31 2019 09:36 PM.
Re: Offset washers [Re: Apache1] #1305495
Sun Mar 31 2019 11:42 PM
Sun Mar 31 2019 11:42 PM
A
Apache1  Offline OP
Shop Shark
Joined: Dec 2018
Posts: 298
Whitwell, TN
Sounds logical....but how much spinning can be expected when tightening against wood?


1959 Apache 3100 Fleetside SWB Resto-Mod



Re: Offset washers [Re: Apache1] #1305496
Sun Mar 31 2019 11:49 PM
Sun Mar 31 2019 11:49 PM
B
bartamos  Offline
Master Gabster
Joined: May 2005
Posts: 5,907
State48 Ranch
They are not for securing planks, they are the holes for attaching "bed" to the frame. As HB says, the counterbore (not countersink) hole locks the washer from spinning, the square on the bolt fits into square in washer to keep bolt from spinning.
Without the counterbore the washer would still spin. Bed wood companies can drill these for you. They are only used at the locations for tying to truck frame. You can buy a counterbore bit and do it yourself if you use the correct technique or a template.


1960 GMC K1001 (The Oreo SpeedWagon)
To each his own or the Highway.
All I know is what the voices in my head tell me and a little from watching TV.




Re: Offset washers [Re: Apache1] #1305509
Mon Apr 01 2019 01:23 AM
Mon Apr 01 2019 01:23 AM
A
Apache1  Offline OP
Shop Shark
Joined: Dec 2018
Posts: 298
Whitwell, TN
Still doesn't explain why they were designed with an offset.


1959 Apache 3100 Fleetside SWB Resto-Mod



Re: Offset washers [Re: Apache1] #1305511
Mon Apr 01 2019 01:34 AM
Mon Apr 01 2019 01:34 AM
K
klhansen  Offline
Shop Shark
Joined: May 2015
Posts: 1,176
Eagle River, Alaska
Originally Posted by Apache1
Still doesn't explain why they were designed with an offset.

Sure it does. If the bolt hole was centered, the washer could rotate in the counterbore. With the bolt hole offset, the outer rim of the washer immediately bumps up against the side of the wood counterbore and can't rotate any farther. They have a square hole for the carriage bolts so that the nut on the bottom of the frame can be tightened.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos
Re: Offset washers [Re: Apache1] #1305540
Mon Apr 01 2019 12:44 PM
Mon Apr 01 2019 12:44 PM
A
Apache1  Offline OP
Shop Shark
Joined: Dec 2018
Posts: 298
Whitwell, TN
OK...that cam action thing...got it!


1959 Apache 3100 Fleetside SWB Resto-Mod




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