Material, surface finish:
Screw in tempered steel, quality class 10.9, black.
Ball in ball-bearing steel, hardened with natural finish or Delrin.
Note:
Surfaces which are not plane and parallel can be firmly clamped or supported with form B, C or F with flattened ball because the movable ball can adapt itself up to 9°.
Further lengths have been designed especially so that ball pressure screws can be glued up. They allow mechanical connecting elements with external thread to be made cost-effectively for small and medium-sized series.