I am having trouble finding what I would call a carriage bolt, it
looks just like a carriage bolt except that it has a spline round
shape under the head instead of a square shape that is usually under
the head of a carriage bolt. The round shoulder under the head is a
fine spline that looks about 8 mm long.
The bolts are used to secure a steel gas tank support arm to the frame
of a truck.
I need a source of supply I can order from here in the USA but I'm
having trouble finding this item.
Thread specs = 10 mm OD X 1.5 mm pitch
Length under head = Need at least 40 mm long but can cut down a longer
bolt if needed.
Head diameter = Approximately 20 mm OD, but can use a little larger if
Grade = Prefer a 10.9 class or whatever the strongest grade available
The round spline shape or shoulder that is directly under the head has
an 11 mm OD.
I have tried local hardware and autoparts stores along with www.mcmaster.com.
I also looked through the www.auveco.com/ catalog but have not found
Does anyone have an idea of where I might find something like this ?