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

1960 series

solid masonry and hollow masonry

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1/2 x 12 Titen HD Concrete Anchor Zinc Plated (20)

5/8-18 x 6 L9 Hex Cap Screw Yellow Zinc Plated Domestic USA (25) 5/8-18 Flat Socket Cap Screws Alloy USS pattern flat washers are5 8 18 x 6 L9 Hex Cap Screw Yellow Zinc Plated Domestic USA (25) . L9 High Tensile Strength Hex Cap Screws are designed for use in high stress, severe service environments. The highest mechanical strength off the shelf fastening system available, its special features control torque tension characteristics to develop high clamp loads when using properly controlled tightening methods. Brighton Best manufactures L9 bolting from AISI alloy steels. L9