A combination spanner, also known as a combination wrench, is a type of hand tool that features an open-end wrench on one side and a box-end wrench on the other side. The open-end wrench is designed to fit onto nuts and bolts with a flat surface, while the box-end wrench is designed to fit onto nuts and bolts with a recessed surface. The combination spanner is a versatile tool that can be used for a variety of tasks, such as tightening and loosening nuts and bolts, and it is commonly used in automotive and mechanical applications.
The box-end wrench on a combination spanner usually has a 12-point design, which allows it to grip the nut or bolt on multiple points and provides a more secure grip compared to a 6-point design. The open-end wrench usually has a 15-degree angle, which allows the user to work in tight spaces and with greater ease. Combination spanners come in different sizes, with each end of the spanner featuring a different size.
When using a combination spanner, it is important to choose the correct size for the nut or bolt being worked on, as using the wrong size can damage the fastener or the tool itself. Additionally, it is important to apply force in the correct direction to avoid rounding off the nut or bolt. Combination spanners are typically made of durable materials such as steel or chrome vanadium, and they may have a coating to prevent rust and corrosion. Overall, combination spanners are an essential tool for any DIY enthusiast or professional mechanic.