The 7 Best Flare Nut Wrench Sets

This wiki has been updated 19 times since it was first published in August of 2019. Flare nut wrenches are specifically designed to tighten hex-style fasteners that are typically attached to fluid or gas lines. They have thick walls and extend around the nut more than standard wrenches, which helps prevent the rounding that can occur because of the soft metals used on plumbing nuts. Our selections considered affordability, durability, and the quality of the materials used. When users buy our independently chosen editorial selections, we may earn commissions to help fund the Wiki.

This wiki has been updated 19 times since it was first published in August of 2019. Flare nut wrenches are specifically designed to tighten hex-style fasteners that are typically attached to fluid or gas lines. They have thick walls and extend around the nut more than standard wrenches, which helps prevent the rounding that can occur because of the soft metals used on plumbing nuts. Our selections considered affordability, durability, and the quality of the materials used. When users buy our independently chosen editorial choices, we may earn commissions to help fund the Wiki.

1. SK Superkrome 373

The SK Superkrome 373 (around $51) includes 9 through 14 millimeter sizes, all with a SureGrip hex design that applies torque to the sides of fasteners and does not pivot on the corners. The surfaces have all been nicely polished to make cleaning easy.

Comfortable rounded handles
Great for hydraulic lines
Comes with a handy storage roll

2. Stanley Proto J3700M

The Stanley Proto J3700M (around $84) is a basic, but perfectly usable, selection of five that should satisfy most auto mechanics' needs. They come in a roll pouch with see-through compartments that allow you to select the right size quickly.

Corrosion-resistant satin finish
10 different head sizes
Made in the usa

3. Craftsman 44096

The Craftsman 44096 (appx. $80) includes both metric and standard sizes and each is made from a single piece of alloy steel. The heads are offset from the handle, which provides a comfortable angle that sits away from the base of line fittings.

Rust-resistant finish
Includes most commonly used sizes
Lifetime warranty

4. Neiko 03323A

Built to last, the Neiko 03323A (appx. $37) are drop forged and constructed from chrome molybdenum steel. These are solid, one-piece tools that have been heat-treated to provide them with a reliable hardness that can withstand daily use.

Can be used with ratchets
Includes a hard case
Comes with 12 sizes

5. Crescent CCFWS0N

If you need to fasten any nuts to a particular tightness, the Crescent CCFWS0N (about $33) feature a 3/8-inch drive that will allow you to measure the force you are applying. Each crow foot is made from high carbon steel for durability.

Includes a storage rail
Meet or exceed ansi specifications
A ratchet is required for use

6. Astro Pneumatic 7120

The Astro Pneumatic 7120 (about $66) brings the convenience of ratcheting mechanisms to hydraulic line tools. While the gripping surfaces are quite thin, in most cases, the torque that is necessary to loosen and tighten line fittings would not be enough to worry about breakage.

Fine-toothed gears
12-point design may round edges
Difficult to use on elbow fittings

7. Gearwrench 81915

The Gearwrench 81915 (around $37) feature flexible heads that can tilt up to 180 degrees, which makes it a lot easier to access fittings that are in difficult-to-reach spots. The carbon steel is nickel-chrome plated to help protect them from corrosion.

Sizes stamped on both sides
Stout gripping walls
Swiveling heads tend to loosen

Last updated by Rafael Perez

Rafael Perez is a doctoral candidate in philosophy at the University of Rochester. His primary focus is the metaphysics of time and the philosophy of mind, with a particular interest in artificial intelligence and antirepresentational models of the mind. He has extensive experience as a mechanic, a construction worker, and a general repairman. This has allowed him to gather a wealth of knowledge on automobile repair, auto parts, carpentry, masonry, welding, and the tools used in those trades. In his spare time, he enjoys playing guitar, woodworking, and fishing.

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