Hexagon Socket ISO Metric Thread Class 14.9 (GR-45H) – Ultra High Tensile Strength Fully threaded and headless – used to secure a pulley, or gear to a spindle, Also known as “Grub Screws” Plain Cup Point for use against hardened shafts where high clamping torques are not practical ‘As produced’ oiled finish (black) – Provides some shelf life but no real corrosion protection in use Tensile stress, Rm 1569 MPa DIN 916 / ISO 4029 / BS 4168-5 / ASME B18.3.6M