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Without making it overly complicated, you want to ask for a 1/4" - 20 bolt. That's 1/4" shank diameter with 20 threads per inch, which is considered "coarse" threads. "Fine" threads would be 28 threads per inch.

You may want to ask for bolts with a greater tensile strength than simple mild steel. Hardware-store variety bolts will be "Grade Three", and will have no distinguishing markings. "Grade Five" bolts are hardened, and will exhibit three hash marks on the head, at 120 degree spacing. Very hard bolts are "Grade Eight", which show five hash marks.

1/4"-20 is a very common size here, and I assume that it won't be too difficult to find on your side of the planet.
 
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