Here is how you can determine the strength or grade class of automotive fasteners using bolts as an example
Most common types of automotive fasteners explained
Common Auto Fasteners Guide » NAPA Blog
Bolt Grades and Bolt Coatings Guide – Fixabolt
Strongest Bolt? Grades Explained & Dyno Tested For Science
PRI Tech: Fastener Strength and Optimized PerformancePerformance Racing Industry
11 Types of Fasteners for the Automotive Industry
The wild, weird science of automobile fasteners and how to select and use them for your street rod project
SAE Bolts
Different Bolt Grades & Bolt Grades Chart - Runsom Precision
Blogs & Infographics - Rogo Fastener Co., Inc.
Fasteners — Superlite Cars
PRI Tech: Fastener Strength and Optimized PerformancePerformance Racing Industry
Grade 8 vs 10.9 High Tensile bolts
Understanding metric hardware, Articles