Pieces cut from a bar, heated uniformly to a low cherry red and cooled in water at 80° Fahrenheit, must stand bending in a press to a curve of which the inner radius is equal to the radius of the bar tested.

A sample bolt is to be slightly notched and bent over to show the quality of the material.

When the bolts are of sufficient length in the plain part to admit of being bent cold, they must stand bending in a press to a curve of which the inner radius is equal to the radius of the bolt tested without fracture.

When the bolts are not of sufficient length in the plain part to admit of being bent cold, the screwed part should stand bending cold without fracture, as follows: -