Wrenches vs. Ratchets and Sockets
'Wrenches perform the same function as ratchets and sockets - tightening and loosening fasteners - but there are differences and situations that call for one over the other.
For example, a box-end wrench is a good option for loosening stuck fasteners because you can apply more torque without risking damage to a ratchet mechanism.
A wrench with an open end fits around a fastener instead of over it, so you can slip it into an area where there isn't room for a socket.
Always make sure the tool you use is suited for the work you're doing. To learn more about ratchets and sockets, take a look at our socket and ratchet guide.
Types of Wrenches
Wrenches are available in a variety of styles for different applications. Some are designed to work with standard (Society of Automotive Engineers or SAE) fasteners, and types of wrenches are for metric applications. Look for color-coded wrenches to help you quickly identify SAE or metric. Here are some of the more common wrench types and their uses.
Other Wrench Types
You may see several other types of wrench, often designed for one specific use.
Socket Wrench: This is a common name for a ratchet and socket. This tool uses different sized sockets that fit over a nut or bolt to install or remove it.
Torque Wrench: A torque wrench uses sockets like a ratchet and socket but allows you to set a fastener to a specific tightness.
Impact Wrench: Available as a cordless power tool or a pneumatic tool, an impact wrench uses an impact force to install or remove nuts and bolts. These tools work with sockets specifically designed to handle the impact force from the tool.
Spark Plug Wrench: A basic spark plug wrench is simply a hex-shaped barrel that fits over a spark plug. A handle insert allows you to turn the wrench to remove and install the plug.
Oil Filter Wrench: This tool is designed specifically for removing and tightening oil filters on an engine. It's available in two designs, one with a metal band that tightens around the filter and one that fits over the top of the filter and works with a ratchet.
Garbage Disposal Wrench: An S-shaped rod designed specifically to fit to the disposal and loosen jams.
Chain Wrench: This plumbing tool is similar to a strap wrench but uses a metal chain rather than a rubber strap to turn pipes and fittings.
Flare Nut Wrench: A type of open-end wrench, flare nut wrenches (also known as brake wrenches) have rounded heads designed to fit around five surfaces of a hex-head fastener for a more secure fit and less risk of damaging fasteners made of soft material.