Common upper swivel with replacable disc complying to AS4133-4-2 , ASTM D7012-14
Included adapters and discs for Specimen sizes 50, 63, 75
Tool-hardened steel to a minimum Rockwell Hardness of 58C
Spherically seated and the other shall be a plain rigid platen.
The diameter of the spherical seat shall be at least as large as that of the test specimen, but shall not exceed twice the diameter of the test specimen.
The centre of the sphere in the spherical seat shall coincide with that of the bearing face of the specimen.
The movable portion of the platen shall be held closely in the spherical seat,
The diameter of the discs shall be the same as the diameter of the specimen and have a thickness-to diameter ratio of at least 1:2.