Grade 5 Carriage Bolts are manufactured from medium carbon steel

#19 x 6 High Speed Aircraft Bit Cobalt

3/4 x 9 Hex Lag Screw Hot Dipped Galvanized

9/16-12 x 1/2 Socket Set Screw Cup Point Alloy

#1 Heavy Duty Drill Bit - Stubby Length

9/16-12 x 3 1/2 L9 Hex Cap Screw Yellow Zinc Plated Domestic USA (25) 1-8 A307A Hex Tap Bolts Zinc Plated Grade 5 Carriage Bolts are9 16 12 x 3 1 2 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