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Replacing Rivets for bolts
#1385369 Sat Nov 21 2020 04:27 PM
Joined: Jan 2019
Posts: 62
C
Cozsum Offline OP
Wrench Fetcher
Hi,

I know this debate has been going on forever, but im looking for some bolts to reattach my crossmember back to my frame on my 57 3100. Im having my frame powder coated and im going to reattach it after. Im looking for a bolt that will not rust (since it will be powerder coated already I didn't want to paint the bolts individually) and have the strength to hold everything in place. Let me know what you think.

Thx

Last edited by Cozsum; Sat Nov 21 2020 05:24 PM.
Re: Replacing Rivets for bolts
Cozsum #1385375 Sat Nov 21 2020 05:51 PM
Joined: Jan 2010
Posts: 4,673
D
Shop Shark
On my 50 I used 5/16 NF grade 8 bolts to replace a few rivets. Flat washers and lock washers.

Make sure what ever bolts you choose have a shoulder. Self locking nuts are an option

Add checking these bolts for tightness to your chassis maintenance schedule

Re: Replacing Rivets for bolts
Cozsum #1385379 Sat Nov 21 2020 06:59 PM
Joined: Jan 2019
Posts: 62
C
Cozsum Offline OP
Wrench Fetcher
Thank you, Did you paint it or left them alone with the zinc coating

Re: Replacing Rivets for bolts
Cozsum #1385384 Sat Nov 21 2020 07:41 PM
Joined: Jan 2010
Posts: 4,673
D
Shop Shark
I did, but rust is not an issue where I live.

Re: Replacing Rivets for bolts
Cozsum #1385399 Sat Nov 21 2020 10:29 PM
Joined: May 2015
Posts: 3,188
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
I wound up bolting in one of the front spring hangers because the rivets were loose (the other side had been bolted in many years ago) using grade 8 bolts tightened till my eyes bugged out. wink My plan is to paint the bolts and nuts along with the rest of the frame when I can get it sandblasted. I had a few other rivets that were loose and tightened them up by heating and peening (got a tool that goes in my air hammer). Worked pretty well. I also plan on riveting on the running board brackets that I had to replace.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
Busting rust since the mid-60's
Re: Replacing Rivets for bolts
Cozsum #1385411 Sun Nov 22 2020 12:18 AM
Joined: Jan 2019
Posts: 62
C
Cozsum Offline OP
Wrench Fetcher
Wow that's cool, thinking back I should of tried to re-rivet them back on with that tool you had.

Re: Replacing Rivets for bolts
Cozsum #1385441 Sun Nov 22 2020 02:51 AM
Joined: May 2015
Posts: 3,188
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Here's a pic of the bucking bar I made out of a chunk of my F250 tie rod and the air hammer bit that I got from Amazon.
Heat the rivets cherry red and peen them over.

Attached Files
IMG_3476.JPG (176.92 KB, 226 downloads)

Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
Busting rust since the mid-60's
Re: Replacing Rivets for bolts
Cozsum #1385479 Sun Nov 22 2020 04:12 PM
Joined: Feb 2000
Posts: 4,215
J
Shop Shark
Don't use stainless steel, they won't rust, but they are not very strong either. Drill the holes to fit the smooth part of the shank of the bolt ( not threaded part ).

Re: Replacing Rivets for bolts
Cozsum #1385481 Sun Nov 22 2020 04:29 PM
Joined: Feb 2004
Posts: 21,599
H
Boltergeist
Anytime I replace rivets with bolts, I use Allen head shoulder bolts and ream the holes for an almost press fit. Drill bits simply don't make accurate enough holes to prevent shifting between the parts you're trying to hold together, no matter how tight you get the bolts. If bolting was "good enough", why would GM have gone to the trouble and expense to rivet crossmembers in the first place?
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Replacing Rivets for bolts
Cozsum #1385486 Sun Nov 22 2020 05:10 PM
Joined: Mar 2019
Posts: 64
T
Wrench Fetcher
Jerry brings up a few great points.

One major advantage of rivets is that the peening operation will swell the body of the rivet to fill the holes. So that does greatly reduce the possibility of the parts shifting. The riveted joint is strong in shear but not in tension.

Riveting is a less expensive manufacturing process than a bolted joint. You only have one piece to insert and one tool to complete the operation. Think of a simple press type tool (hydraulic C-clamp) to assemble it. A rivet works better in thinner joints where you cannot get enough bolt stretch to maintain clamp force.

A properly designed and assembled bolted joint should not move. The friction between the parts that is created by the clamp force (bolt tension) prevents movement.


Rusty
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