This is the 82 Degree which is a little more common
Fastener Dimensional Data for Black Oxide Flat Head Socket Cap Screws

For Reference Only:

Black Oxide Flat Head Socket Cap Screws Dimensional Data
Machine Screw Threads - Dimensional Data

Find Coordinating nuts and washers for your socket screws below:

Nuts:

Hex Nuts - Black Oxide
Lock Nuts - Black Oxide
Hex Nuts - Stainless Steel
Lock Nuts - Stainless Steel
Kep Nuts - Stainless Steel


Washers

Flat Washers - Black Oxide
Finish Washers - Stainless Steel