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1 L9 USS Tension Flatwasher Yellow Zinc Plated Domestic USA (20) M12-1.75 Hex Cap Screws 8.8 DIN 931 Zinc Plated 1/2-20 x 5 L9 Hex1 L9 USS Tension Flatwasher Yellow Zinc Plated Domestic USA (20) . L9 High Tension USS 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.