Bolt Size for 15" Hinged String Trimmer (ST1500SF)

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I recently lost both bolts that lock the shaft in place on the 15" trimmer (model ST1500SF).

Does anyone know the exact size of these bolts?
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Posted 4 months ago

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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).