Some bolts are tucked away behind components where a ratchet socket cannot fit and a standard wrench has no room to swing. A crowfoot wrench solves this. It is a wrench head with a square drive hole that snaps onto a socket extension. This allows you to reach deep into an engine bay or suspension tower, turning the bolt from above using a long extension and ratchet. They are commonly used on power steering lines, fuel injectors, and oxygen sensors. Keep the wrench head at a 90-degree angle to the ratchet handle to maintain accurate torque settings.
Mechanic Glossary
Crowfoot Wrench
A compact, open-ended or flare-nut wrench head designed to attach to a standard socket extension, reaching bolts in extremely tight spaces.
Frequently Asked Questions
If the crowfoot is aligned straight with the torque wrench handle, it increases the effective length of the tool, causing you to over-torque the bolt. A 90-degree angle maintains the correct calibration.
Open-end crowfeet have a standard two-sided jaw for speed. Flare-nut crowfeet wrap around five sides of a hex nut, making them much less likely to slip on soft metal fuel or brake lines.
No. Crowfoot wrenches are thin and can break under impact force. Use hand tools only.
They are available in 3/8-inch drive for standard automotive work and 1/2-inch drive for larger suspension and truck applications.