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Carriage bolt sizes. #1242587
Wed Nov 08 2017 08:18 PM
Wed Nov 08 2017 08:18 PM
S
Stooby  Offline OP
Wrench Fetcher
Joined: Aug 2017
Posts: 54
South Yorkshire
Hi can anyone tell me the sizes of carriage bolts for a 56 3100 short stepside bed strips.Width required and various lengths.Thanks in advance.

Last edited by Stooby; Wed Nov 08 2017 08:57 PM.
Re: Carriage bolt sizes. [Re: Stooby] #1242604
Wed Nov 08 2017 10:05 PM
Wed Nov 08 2017 10:05 PM
B
bartamos  Offline
Master Gabster
Joined: May 2005
Posts: 6,211
State48 Ranch
I won't say what I want to say, so I will offer This suggestion as a gentleman.


1960 GMC K10 (The Oreo SpeedWagon)




Re: Carriage bolt sizes. [Re: Stooby] #1242627
Thu Nov 09 2017 01:02 AM
Thu Nov 09 2017 01:02 AM
G
Gord&Fran  Offline
Shop Shark
Joined: Jul 2000
Posts: 649
Mill Bay, BC, Canada
I will be installing my new stainless steel bed strips in the next day or so. Have 1/4" dia x 1 1/4" long carriage bolts for the job. I'm using fibre lock nuts instead of lock washers.


Gord
----
1954 1/2 ton 235 4 speed
Re: Carriage bolt sizes. [Re: Stooby] #1242631
Thu Nov 09 2017 01:40 AM
Thu Nov 09 2017 01:40 AM
B
bartamos  Offline
Master Gabster
Joined: May 2005
Posts: 6,211
State48 Ranch
The stainless steel hardware I posted averages to 14ยข each. I could not beat that price for SS at my hardware store. Also the square under the head will fit the strip square hole. Just my analysis. Shipping to U.K. would probably kill the deal for Stooby. Luckily Gord gave the sizes. That would be M6 hardware. The square on the M6 will be virtually the same as SAE 1/4 bolt. If you use nylon locking nuts and a lock washer and flat washer, your bed could withstand a Saturn V first stage separation. Add Loctite and you are a go for re-entry.


1960 GMC K10 (The Oreo SpeedWagon)




Re: Carriage bolt sizes. [Re: Stooby] #1242679
Thu Nov 09 2017 07:56 AM
Thu Nov 09 2017 07:56 AM
S
Stooby  Offline OP
Wrench Fetcher
Joined: Aug 2017
Posts: 54
South Yorkshire
Thanks for the replies.Any savings we in the UK can make from buying in the US soon disappears on postage, import duty and vat.

Re: Carriage bolt sizes. [Re: Stooby] #1243352
Wed Nov 15 2017 02:50 AM
Wed Nov 15 2017 02:50 AM
5
52Carl  Offline
Master Gabster
Joined: Mar 2010
Posts: 5,753
Virginia
Anyone who combines nylon locking nuts with carriage bolts is at serious risk of being de-friended by me, but fortunately I am not technically savvy enough to know how to do that electronically. smile
Especially with steel ones when they corrode and you can't get them off because the square base won't hold the bolt steady. The stainless ones aren't much better due to the tendency for them to gall upon installation.
Another issue with bed strip bolts is the awkward position which one must get into to get the nuts on. Installing that many Nylon locking nuts with a tool for the entire length of the bolt will take 7 years, 3 months, and result in funeral costs of either the installer or innocent bystanders.
Carl

Re: Carriage bolt sizes. [Re: Stooby] #1243366
Wed Nov 15 2017 04:42 AM
Wed Nov 15 2017 04:42 AM
G
Gord&Fran  Offline
Shop Shark
Joined: Jul 2000
Posts: 649
Mill Bay, BC, Canada
Stainless strips, stainless bolts, stainless washers and stainless nylon lock nuts. Job took about 3 hours. Biggest issue was getting the spacing between the boards right. Started at one side and then realized I should have started at the center and worked both ways, so started over. I'm happy with the result.

No problem, I have plenty of friends.


Gord
----
1954 1/2 ton 235 4 speed
Re: Carriage bolt sizes. [Re: 52Carl] #1243392
Wed Nov 15 2017 01:54 PM
Wed Nov 15 2017 01:54 PM
4
46Sparky  Offline
Shop Shark
Joined: Feb 2008
Posts: 809
USA
The Mar-K bed assembly instructions warn to not not over tighten the nuts and bolts holding the bed strips in place to prevent bending the strip. It would seem if the bolt galled at all, the strip would be damaged and apparent. I imagine the nylock nuts and either stainless or regular steel bolts would be fine in this application, as long as they are not over tightened?

Re: Carriage bolt sizes. [Re: Stooby] #1243472
Thu Nov 16 2017 02:05 AM
Thu Nov 16 2017 02:05 AM
5
52Carl  Offline
Master Gabster
Joined: Mar 2010
Posts: 5,753
Virginia
One can use whatever fastener one likes for this application and be just fine.
The strips were originally held on with unpainted steel hardware (carriage bolts, flat washers, lock washers, standard plain ole nuts). This means that the fasteners were locked into place as soon as they got rained on.

Re: Carriage bolt sizes. [Re: Stooby] #1243494
Thu Nov 16 2017 06:51 AM
Thu Nov 16 2017 06:51 AM
B
bartamos  Offline
Master Gabster
Joined: May 2005
Posts: 6,211
State48 Ranch
The nylon not and lock washer combo was a spoof on over doing something and to reference rockets. If you de friended me, I would delete it all so as to get re friended. (this is sounding sketchy)

However in order to not over tighten hardware, if that's what is instructed, nylon lock nuts are a perfect way to lock without squeeze. (bending strips)

When dismantling old bed parts, you are correct, they are always rusted on. That's why I use my big honkin electric impact to tighten them until they snap (2 seconds for 1/4-20). They grip and don't spin the square hole. If you are replacing the strips it doesn't matter about bending. But They don't seem to bend. Works best on bed sides and wheel well bolts. Cutting bolts off with an angle grinder is very difficult up under there.


1960 GMC K10 (The Oreo SpeedWagon)





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