USS pattern flat washers are manufactured from low carbon steel to meet ASTM F844

They install quickly

When you’re looking for high-quality toggle bolts for an upcoming project

5/8-11 x 10 A307 Grade A Carriage Bolt Zinc Plated

Typical hardness is HRB 68 - HRC 32

1/4 Heavy Duty Jobber Drill Bit (12) Nylon Insert Locknuts Zinc Plated USS pattern flat washers are1 4 Heavy Duty Jobber Drill Bit . Web construction is heavier than general purpose construction making it particularly suitable for cotter pin hole drilling and cross hole drilling in head of bolts. The heavy construction affords efficient drilling in stainless steel and other hard materials. The split point reduces the thrust requirements and minimizes walking.