Button head:
https://us.misumi-ec.com/vona2/detail/221005020675/?Category...
Cap screw: https://us.misumi-ec.com/vona2/detail/221005020664/?Category...
Flat head: https://us.misumi-ec.com/vona2/detail/221005020686/?Category...
These are just standard parts though. Misumi's real configuration flexibility comes from parts that are parametrically defined. For example you can basically design a shaft by specing the material, coating, diameter, length, tolerances, and additional parametric features (external threading, tapped holes, flats, grooves, etc).
Here's an example: https://us.misumi-ec.com/vona2/detail/110302399810/
Once you've specified the parameters, it generates a price table including quantity discounts.