acceptable for ACQ pressure treated lumber

3/16 x 4 Mushroom Spike Zinc Plated (100)

6-32 x 1/2 Phillips Flat 82 Undercut Machine Screw Black Zinc Plated (10

5/32 Cobalt Heavy Duty Jobber Drill Bit

2-4 1/2 x 16 Socket Cap Screw Alloy

1 1/2 L9 SAE Tension Flatwasher Yellow Zinc Plated Domestic USA (10) 1 1/4-7 Flat Socket Cap Screws Alloy acceptable for ACQ pressure treated1 1 2 L9 SAE Tension Flatwasher Yellow Zinc Plated Domestic USA (10) . L9 High Tension SAE pattern flat washers 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.