Button head machine screws

I look in The Machinery Handbook for industry standard dimensions like that. Supplier's online catalogs often include that info, or reference the SAE or ISO standards number.

Have you tried a google search for button head machine screw dimensions? Do you want SAE or metric?
 

Fastenal did the job, thanks guys.
I have a flat bed trailer with a weight distrubtion hitch with anti-sway built into it.
The torsion bars lay on a pair of pads, much like break pads. These pads are glued to steel backer pads which are lay in a pocket of a J formed bracket made of cast iron or forged steel, and is held in place with 1 button head screw. Those screws must be metric as they are 0.231" dia. They have a Phillips head, which is recessed in a hole in the pad.
This is a Reese hitch.
Three of the four pads have come off. And Reese says that no one else has complained about the pads coming loose.
Those J brackets are tapped and the screws screw into them, next to impossible to remove. And Reese recommends using Lock Tite on them.
I'm thinking of drilling them out to 1/4" and using a SS 1/4" Allen button head screw and nut. Then next time they should not be very hard to remove.
Anyone here had the same problem? And/or have a better fix?

Thanks,
Dusty
 

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