5/8-18 X 4 1/2 Hex Head Cap Screw L9 Yellow Zinc Dichromate Plated 440550

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.