Hex Bolt Dimensions & Hex Cap Screw Dimensions Have you ever wondered “how thick is the head of the bolt that I just bought”? … | Metric bolt sizes, Hex bolt, Chart
Selecting the Right Screw | DigiKey
Metric bolt heads & spanner / hex key sizes
Screw Chek'r Metric Screw Thread Size Gauge No. 2 (8MM to 14MM) 1/8 Inch Heavy Gauge Steel Screw Checker, Made in USA, Chrome, 02130
How to Measure Screws & Bolts - US & Metric Sizing | Fasteners 101