Carriage bolt source
#7
Why would they have to be fine thread and I have never seem 9/16 bumper bolts. I need some 1/2 by about 3 (maybe 2 1/2) inch ones for the back bumper on my 54 Olds. I have finally concluded the only way I will get them it to weld or braze some 1/2" all thread to shorter bumper bolts and then cut it to the length I need. I will be doing that next week since I have some shorter bumper bolts. Good luck with your search.
#9
You dont have to weld them in. Go to OReillys and have them order bolt retainers. Thats what was used to hold the carriage bolt tight enough in place to be able to get the lock washer and bolt started. It also allows the bumper to be adjusted and not locked in place.
#11
Try Fastenal, McMaster-Carr, Grainger or some others. Fine threads are believed to remain tight in vibrational situations. Coarse thread and lock washers could work. Or get them longer and double nut them. Or, there is Loc-tite.
#12
I am not intending to weld the bolts in the car. I am simply welding an extension on the bolt to make it longer since I can't buy one long enough. I bought a 1/2 piece of all thread about a foot long for less that $1.50. I already have the bumper bolts to add the length to. I will just braze a bolt on each end of the all thread and then cut them to about 3 inches. Done.
#13
https://www.amkproducts.com/bulk-fas...oduct_ID=15004
Maybe ?
Coarse thread, but I wouldn't think bumper attachment is a high-torque high-vibration application.
Maybe ?
Coarse thread, but I wouldn't think bumper attachment is a high-torque high-vibration application.
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