Square head bolts are used for heavy lumber, machinery, furniture, railroads, and electrical connections. They can be tightened with an adjustable wrench and are useful in tight spaces. The square head design allows for secure tightening without fear of rounding off the bolt head.
Square head bolts are typically lagging bolts. These anchor bolts look like very large screws and are used for joining heavy lumber. The advantage of using square head bolts is that they can be tightened with an adjustable wrench. Using the wrench, the square head bolts can be easily tightened in tight spaces where other tools cannot be used. While lag bolts make up the majority of square head bolts, there are other bolt types that share the square head design.
Often, bolts used in machinery use a square head. Placing fasteners in iron channel requires the designer to use square head bolts. The bolt is able to sit within the channel with the square head resting against the channel wall. This allows the bolt to be tightened without the need to hold the square head of the fastener.
The furniture industry is a major user of square head bolts. Bolts allow furniture manufacturers to use them in blind places. A blind location is where the bolt head is not visible or reachable. Furniture designers provide wood to fit snugly around the sides of the socket head bolts and often cut an indentation in the wood to allow the bolts to fit snugly. Another piece of wood is placed over the bolt, holding it securely in place. With the square head bolts held in place, the nuts can be tightened tightly, securing the legs or other relevant parts in place, all without holding the bolt head.
In the early years of the railroad, fasteners with square heads were used to bolt sections of rail together. By using a square head, bolts can be tightened securely without fear of rounding off the bolt head. Often using less manpower, it was concluded that the square head would also fit snugly into the channel formed by the curve of the rail, making it easy to tell if the bolt was seated correctly. The square heads work so well with the rail that they are still used as the preferred fastener when laying or repairing the rail.
Electrical connections are often made with square head nuts and bolts. The small size of the connections, as well as the tight spaces in which the connections are made, require a fastener that can be easily tightened and removed using only needle nose pliers. Connections, such as wall sockets and light switches, enjoy the benefits of square head bolts when used in confined spaces.
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