What is the feature of a SAE Grade 2 bolt in terms of appearance?

A SAE Grade 2 bolt is characterized by its appearance of being relatively smooth, without significant surface imperfections like bumps or rough textures. This smooth finish helps to ensure that the bolt can be easily inserted into the material it is fastening and provides a reliable surface for torque application. The fact that it typically does not show visible bumps contributes to its ability to tightly grip the materials it is connecting, ensuring a secure and stable connection.

While other options describe characteristics that might be associated with different grades or types of bolts, a Grade 2 bolt generally stands out for its functional and aesthetic smoothness. This finish ensures that they can be used in various applications without the concerns that rough surfaces might present, such as potential for binding or uneven surface contact.