DIN Standard - DIN 867, DIN 3962, DIN 3963, Grade / Quality 9 or equivalent. SSN10/10B and SSN10/12B are hobbed type pinions with cutter runout after the 5 mm gear face width. Steel Metric Spur Gears. RS Pro high quality steel spur gears in a range of gear ratios. Ideally used for speed reduction or increase, torque multiplication, resolution and accuracy in positioning systems. Features and Benefits. Steel EN8 (080M40/080M46) or equivalent Tensile strength: 569N/mm ;sup>2 ;/sup> (min.) 20° pressure angle