PICTURES ARE REPRESENTATIVE OF ITEM, BUT ARE NOT OF THE ACTUAL ITEM. Product dimensions, finish, head markings, thread length, stamping shape or forging shape, etc., may differ from picture. Products are guaranteed to meet the specifications to which they are manufactured. Specifications allow for tolerances in dimension and shape, which can vary from lot to lot. Upon installation, the pin diameters contract and press against the sides of the hole. This outward pressure holds the pin in place.The coiled pin is more flexible than the Slottedted variety making it preferable when used in softer materials. Coiled pins are easier to install than Slottedted pins and are superior in their ability to withstand vibration following installation. . 1070 - 1095 Steel. Stock Thickness Range: Over 0.001 thru 0.010: Vickers 420 - 545. Over 0.010 thru 0.025: Rockwell 15N 82 - 86.4. Over 0.025 thru 0.050: Rockwell A 72 - 76.8. Over 0.050 thru 0.094: Rockwell C 43 - 52.