They are available in high strength

1/4 x 1 3/4 Phillips Flat Hi-Low Thread Concrete Screws Blue Ceramic Coated

1/2-20 x 6 L9 Hex Cap Screw Yellow Zinc Plated Domestic USA (125)

1/2-13 x 8 1/2 STRONG-BOLT® 2 Cracked and Uncracked Concrete Wedge Anchor Zinc Plated (25)

1/2-20 x 4 Button Socket Cap Screw Alloy

1/2-20 x 4 L9 Hex Cap Screw Yellow Zinc Plated Domestic USA (25) HeadLOK Heavy Duty Flathead Fasteners They are available in high1 2 20 x 4 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