SQUARENESSSquareness is the quality of being at an angle of 90° such as "surface must be square with axis". A tolerance of 2° should be allowed for rubber srfaces that are not ground.
Rubber Product with Metal InsertExample:
Rubber-to-metal product in Sketch 1 Fig 6. Rubber surface B-B is square with axis A-A as the angle is true 90°. Sketch 2 indicates the same example with 2° tolerances exaggerated.
Note: This type of product requires closer control than is usually normal with commercial products.