FC02 – Serrated Ball End | Precision swivel ball that can be used either as a contact bolt or rest pad. As contact pads these swivel ball units are ideal for evenly distributing clamping pressure on sloped or uneven surfaces. | Material: | Body – Medium Carbon Steel. | Ball – Through Hardened Steel EN 31. | Hardness: | Bolt – HRC 35. | Ball – HRC 62. | Surface Finish: Black Oxide.