unfortunately, this is not a typical Allen head shoulder bolt. This is what is referred to as a dog point body bolt. This is used by vehicle manufacturers. It has atypical size components compared to a standard shoulder bolt. The shoulder on this is 9mm in diameter with a length of 4 mm. The head is 16.5 diameter and 3 mm thick with a 4 mm shallow hex socket. The threaded portion is 18mm.what you have there is referred to as a (allen head?) "shoulder" bolt, Try Fastenal
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