LOW SOCKET HEADS ARE HIGH STRENGTH, PRECISION FASTENERS THAT ARE DESIGNED TO BE USED IN APPLICATIONS WHERE HEAD HEIGHT CLEARANCE IS A PROBLEM. BECAUSE OF THEIR REDUCED HEAD HEIGTH AND SMALLER SOCKET SIZE, THEY NORMALLY CANNOT BE PRELOADED AS HIGH AS A STANDARD SOCKET HEAD CAP SCREW. CLASS 10.9 HAS A MINIMUM TENSILE STRENGTH OF 1040 MPA, OR APPROXIMATELY EQUIVALENT TO SAE GRADE 8.