Note that the little two-pager I posted recommends NAS 6303 Series High Temperatuer Alloy Hex Bolts for your brake hat, coat, and walking stick.
"Identical in external configuration to the NAS 6203 series bolts listed above. Made from A286 stainless steel alloy, rated for 1200°F operation. Minimum tensile strength is 160,000 psi; minimum shear strength is 95,000 psi. The brake hat bolt of choice for all serious race cars."