Bolt size for 15in folding string trimmer hinge?

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I lost one of the shaft hinge bolts to my 15 in string trimmer (ST1500SF), does anyone know the bolt size so I can replace it? 
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Posted 2 years ago

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Blue Angel, Champion

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Mine is a straight shaft so I'm no help. If you have the other one, take it to a hardware store and match it up with something out of a bolt bin. Be sure the threads are identical.

I'm gonna take a wild guess and say M4x30mm SHCS, or something similar. Let me know if I'm close! :-)
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(a)Typical Engineer

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M4 (e.g. metric 4mm diameter) sounds right, but I'm thinking more like 35-40 mm 1-3/8" to 1-1/2".  SHCS = socket head cap screw.  Best way to get a replacement is to visit the local neighborhood hardware store (or big box store if you must).