Why are Robertson screws not used in the US: A Deep Dive into a Canadian Fastener's American Absence
If you've ever spent time in Canada, you might have noticed a peculiar type of screw head: the Robertson, also known as the square drive. These screws, with their distinctive square-shaped recess, are ubiquitous in Canadian construction and DIY projects. Yet, walk into any hardware store in the United States, and you'll find them to be a rare sight, overshadowed by the Phillips and flathead screws that dominate the American market. The question naturally arises: Why are Robertson screws not used in the US? The answer is a fascinating blend of history, patent law, market dominance, and practical considerations.
The Genesis of the Robertson Screw
The story of the Robertson screw begins in the early 20th century with Peter L. Robertson, a Canadian inventor. In 1908, Robertson patented his innovative square-drive screw. He developed it for his own use in manufacturing bicycle handlebars, seeking a fastener that offered superior grip and torque compared to the prevailing slotted (flathead) screws of the time.
The Advantages of the Robertson Drive
Robertson screws offered several compelling advantages:
- Superior Torque: The square recess allowed for significantly more torque to be applied without the driver camming out (slipping out of the screw head). This meant less stripping of the screw head and less risk of injury.
- Self-Centering: The square shape naturally centered the driver bit in the screw recess, making it easier to start and drive screws, especially when working overhead or in awkward positions.
- Reduced Cam-Out: Unlike Phillips head screws, which are designed to cam out under excessive torque to prevent over-tightening, Robertson screws offered a secure connection that resisted cam-out, making them ideal for demanding applications.
- Durability: The robust design of the square recess contributed to the longevity of both the screw and the driver bit.
The Patent Predicament
One of the most significant hurdles for the widespread adoption of Robertson screws in the United States was a patent issue. Peter Robertson’s patent for the square-drive screw was granted in 1914 in the U.S. However, a critical part of the story is that the patent expired. While the initial patent provided a window of exclusivity, once it lapsed, other manufacturers were free to produce similar designs. But by then, other screw types had already gained a foothold.
A commonly cited, though often debated, reason for the limited initial adoption is that Robertson himself was hesitant to license his patent broadly, particularly to major American manufacturers. He aimed to control the quality and production of his invention. This cautious approach, while understandable from a business perspective, inadvertently slowed down the widespread distribution and recognition of his screws in the U.S. market.
The Rise of the Phillips Head
While Robertson was developing his square drive, another inventor, Henry F. Phillips, was working on his own screw design. Phillips patented his cross-shaped recess screw in the late 1930s. The Phillips screw was designed with a specific cam-out feature, intended to prevent over-tightening, which was crucial for the emerging automated assembly lines in the automotive industry.
The automotive industry was a massive and influential sector in the United States. When General Motors began using Phillips head screws in their vehicles, it provided an enormous boost to their adoption. The sheer volume and consistency of demand from the automotive sector cemented the Phillips head as the de facto standard in many American industries. This created a powerful network effect, making it difficult for any other screw type to compete.
Market Dominance and Inertia
By the time the Robertson patent expired and the Phillips head gained widespread acceptance, American manufacturers and consumers had become accustomed to the Phillips system. Tooling, manufacturing processes, and even worker training were geared towards Phillips screws. Introducing a new, albeit superior, system like the Robertson would have required significant investment and disruption.
Hardware stores stocked Phillips and slotted screws because that’s what customers asked for and what manufacturers used. This established market dominance created a strong inertia, making it challenging for Robertson screws to break into the American consciousness and supply chains.
Practical Considerations and Perception
While the historical and patent reasons are significant, there are also practical perceptions that contribute to the Robertson's absence in the U.S.
- Tool Availability: For the average American consumer or professional, finding Robertson drivers and bits readily available in local hardware stores is difficult. This lack of availability reinforces the idea that they are not a standard option.
- "Canadian" Association: For many Americans, Robertson screws are simply perceived as a "Canadian thing." This association, while not a technical drawback, creates a psychological barrier to adoption.
- Perceived Niche Use: While electricians and woodworkers in certain regions of the U.S. might be familiar with and even use Robertson screws for specific applications due to their superior grip, they are not generally perceived as an everyday fastener for general construction or household repairs.
The Enthusiast's Choice
Despite their limited presence, Robertson screws are not entirely unknown in the U.S. Many professional woodworkers, cabinet makers, and even some electricians appreciate the superior performance of the square drive. They often import their Robertson screws or purchase them from specialized online retailers.
The common sentiment among those who advocate for Robertson screws in the U.S. is that they are a superior fastener. They offer a more secure grip, reduce the risk of stripping, and make tasks easier. However, until there's a significant shift in manufacturing practices, widespread availability, or a compelling marketing push, the Robertson screw is likely to remain a celebrated, but niche, fastener in the American landscape, largely confined to its Canadian homeland.
Frequently Asked Questions (FAQ)
How do Robertson screws compare to Phillips screws in terms of performance?
Robertson screws generally offer superior performance. Their square recess allows for more torque without the driver slipping (camming out). This means less risk of stripping the screw head and a more secure connection, making them ideal for demanding applications.
Why didn't Robertson screws become popular in the US when they were invented?
Several factors contributed to their slow adoption in the U.S. initially. While Peter Robertson held patents, his licensing strategy was cautious, and the patent eventually expired. Crucially, the Phillips screw, with its cam-out feature designed for automotive assembly lines, gained significant traction and became the dominant standard in American manufacturing before Robertson screws could establish a strong foothold.
Can I buy Robertson screws and drivers in the United States?
Yes, you can purchase Robertson screws and drivers in the United States, but they are not as readily available as Phillips or flathead screws. You'll typically find them at specialized hardware stores, online retailers, or from woodworking supply companies. They are not a standard offering in most general hardware stores.
Are Robertson screws stronger than other screw types?
Robertson screws themselves are not inherently made of stronger material, but the drive system allows for more torque to be applied to the screw without stripping. This means you can drive them tighter and more securely, which can lead to a stronger joint in practice. The design also reduces the likelihood of damaging the screw head during installation.
