Professionals BUTTON HEAD CAP SCREW BUTTON HEAD CAP SCREW Z Controlled hex socket for maximum wrenching strength. Z Uniform socket depth for accurate key fit & higher torque. Z Smooth fillet radius to withstand head soundness. Z Formed threads with improved root radius provide greater strength to threads. Z Uniform & uninterrupted grain flow for greater strength. Z Controlled mechanical properties for higher strength Z High grade alloy steel for good strength & wear resistance. Z Smooth radiuses head ensures easy handling to the user. Z Controlled concentricity in totality to create a high resistance to lateral movements MORE DETAILS