Factors To Consider When Choosing Single And Double handle Hand Tools
Single-handle tools are tube-like tools measured by handle length and diameter. The diameter is the length of a straight line through the center of the handle.
- For single-handle tools used for precision tasks, select a tool with a handle diameter of 1/4 inch to 1/2 inch.
- For single-handle tools used for power tasks, select a tool that feels comfortable with a handle diameter in the range of 1 1/4 inches to 2 inches. You can increase the diameter by adding a sleeve to the handle.
Double-handle tools are measured by handle length and grip span. The grip span is the distance between the thumb and fingers when the tool jaws are open or closed.
- For double-handle tools (plier-like) used for power tasks, select a tool with a grip span that is at least 2 inches when fully closed and no more than 3 1/2 inches when fully open. Consider using a clamp, a grip, or locking pliers when continuous force is required.
- For double-handle tools used for precision tasks, select a tool with a grip span that is no less than 1 inch when fully closed and no more than 3 inches when fully open.
- For double-handled pinching, gripping, or cutting tools, select a tool with handles that are spring-loaded to return the handles to the open position.
Edges and Surfaces
It’s important to consider the edges and surfaces of the handles of tools you want to use. Be
sure to check the following:
- Select a tool without sharp edges or finger grooves on the handle.
- Select a tool that is coated with soft material.
Select a tool with an angle that allows you to work with a straight wrist.
- Tools with bent handles are better than those with straight handles when the force is applied horizontally (in the same direction as your straight forearm and wrist).
- Tools with straight handles are better than those with bent handles when the force is applied vertically.
- For tasks requiring high force, select a tool with a handle length longer than the widest part of your hand—usually 4 inches to 6 inches.
- Prevent contact pressure by making sure the end of the handle does not press on the nerves and blood vessels in the palm of your hand. If the handle is too short, the end will press against the palm of your hand and may cause an injury.
- Select a tool that has a non-slip surface for a better grip. Adding a sleeve to the tool improves the surface texture of the handle. To prevent tool slippage within the sleeve, make sure that the sleeve fits snugly during use. Remember, a sleeve always increases the diameter or the grip span of the handle.