Intro to Millwright Practice Exam 2025 - Free Millwright Skills Practice Questions and Study Guide

The shape of a Robertson screwdriver head is square. This design features four sides and allows for better torque transfer compared to other shapes, such as flat or round heads. The square shape means that the screwdriver fits snugly into the corresponding square socket of the screw, reducing the likelihood of slipping out, which enhances precision and control while driving screws.

The square design also provides an advantage in applications where screws need to be driven into hard materials. The increased surface contact area helps improve grip and minimizes wear on both the screwdriver and the screw head over time. This makes the Robertson screwdriver particularly useful in construction and woodworking, where durability and effectiveness are essential.

Moreover, this type of screw and screwdriver is commonly recognized in Canadian carpentry, where it was invented, making it a vital tool for builders and millwrights in those settings. Understanding the practical benefits of the square Robertson head can significantly influence the choice of tools when working on specific tasks or projects involving screws.