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Overload of the Day

DMiller

DMiller

Senior Member
Joined
Feb 21, 2010
Messages
16,550
Location
Hermann, Missouri
Occupation
Cheap "old" Geezer
What is notable is a Gr8 will snap before a Gr5, those will distort first then break. Would step up to Flanged Head Frame Bolts and Nuts(Fine Thread), Increase Diameter from what appears a 5/8"? to a full 3/4"., if were only 1/2" then go to 5/8", build a stouter bracket for the bumper more like a Crossmember then can REALLY tear some Sh!t up!!
 
J

JLarson

Senior Member
Joined
Aug 23, 2020
Messages
656
Location
AZ
Occupation
Owner- civil and heavy repair/fab company
Most truck bumper attachments are pretty underwhelming, which is kinda nice when they need to come off for major service work bad when cabled up to a piece of dirt equipment.
 
Hallback

Hallback

Senior Member
Joined
Jun 1, 2011
Messages
2,322
Location
Aberdeen Wa.
Occupation
Gyppo tower logger
You won't believe it but the caliper measures those bolts at 15/32 across the thread. Absolutely insane that is what they used to mount that with and a skinny 5/16s thick bracket. It should be 3/4 inch bolts as stated above just like what is used to hold the hitch into the center of the bumper. Kenworth will be hearing from me Monday morning for sure
 
J

JLarson

Senior Member
Joined
Aug 23, 2020
Messages
656
Location
AZ
Occupation
Owner- civil and heavy repair/fab company
Yeah I fixed a bumper on a truck a little while back that goes off road and tugged on with loaders and graders a lot, had a mix of 10.9 and G8 bolts that were snapping, we straightened up the brackets and reamed the holes for 3/4" G5.
 
S

Spud_Monkey

Senior Member
Joined
Sep 15, 2018
Messages
6,509
Location
Your six
Occupation
Decommissioned
My bumper hitch plate I custom built and I thought I under built for my straight truck with my camper on it has beefier bolts than that and thicker plate by double :confused:. Guess I need to put it on my semi since it has no rear bumper hitch.
Nice rig btw, it looks like it can take a beating except that part :p
 
Truck Shop

Truck Shop

Senior Member
Joined
Dec 7, 2015
Messages
16,873
Location
WWW.
My experience with washers used with frame bolts is-- it doesn't work. It just adds two more places to slip. Why manufactures went back to that
had to be cost cutting-my guess. I only use course thread flange bolts with stover flange nuts. There spendy but way less trouble.
 
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