Can anybody identify this screw?

[pjh56]

I have just taken my car out for a short drive and found this 3/4 inch long screw on the drive just behind where my car usually sits. It looks familiar but I can't think where I have seen it before, is it to set the beam on the headlights?
any ideas anybody?[frame][/frame]

[Kevin]

Rusty screws always look familiar to me, what diameter is it.

[chrisryder]

if it's quite small (2BA or M5-ish) then it could be a hockey stick stud and nut. mine were forever popping out. studs are now loctited in

[MarkyB]

I'm pretty sure hockey stick studs aren't pointed.
Someone's chucked it under your car to wind you up.

[simmitc]

At the non-pointed end, has it sheared off? If yes, then there could be a head missing, if no, then it's a stud.
If it is sheared, is the break as rusty as the rest? If yes then it's been there a long time.
Is the apparent rim to the left of the nut genuinely an un-threaded collar? If yes, then it again points to a stud.
Depending on the diameter, seat fixing bolts and door hinge bolts usually have pointed ends. However, the hinge would not normally have a nut (it goes into a plate). If it's from the seat mounting then it means that the nut separated from the floor. so get out the welding kit.

Of course, a previous owner could have used any bolr to secure any thing.

[pjh56]

I think it is off the hockey stick because I remember seeing it when I replaced them last year.

Thank you for your help

Regards
Peter

[mike.perry]

Chuck it in your tin of spare bolts until you find what it fits. It will probably still be there in ten years time - unless you throw it away when you will be looking for it next week.

[pjh56]

Chuck it in your tin of spare bolts until you find what it fits. It will probably still be there in ten years time - unless you throw it away when you will be looking for it next week.