Michael,
I looked for some of these a few weeks ago to rebuild the turntable on my trailer. They are called "plough bolts". I still couldn't get any. In the end I just used countersunk Allen bolts. The profile is slightly different on the countersink but they did the jobs perfectly and as part of the turntable will always be hidden from view. Alternatively get some ordinary bolts and turn the head up on a lathe?
John
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