Pipe Wrench Guide: Sizes, Types, and Choosing the Right One

Types of Pipe Wrenches

A standard (Stillson-type) pipe wrench is the classic design with a fixed lower jaw and an adjustable upper jaw on a threaded hook. The slight angle between the jaws creates a self-tightening cam action — the harder you pull, the tighter the grip. This is the most common type and handles most plumbing tasks.

An offset pipe wrench has the jaws angled relative to the handle, giving you clearance in tight spaces where a straight wrench body would hit the wall or adjacent pipes. Useful under sinks and in mechanical rooms.

An end pipe wrench has jaws at a right angle to the handle, designed for working close to walls where even an offset wrench cannot reach. The jaws grip from the end rather than the side.

An aluminum pipe wrench weighs about half as much as a steel wrench of the same size. The jaws are still steel for grip, but the body is aluminum alloy. This matters when you are holding a 24-inch wrench overhead or carrying multiple wrenches to a job.

Choosing the Right Size

Pipe wrench size refers to the overall length, which determines the maximum jaw opening and the leverage available. Common sizes run from 6 inches to 48 inches.

A 10-inch wrench handles pipe up to 1 inch in diameter. This covers most under-sink supply lines and small fixture connections. A 14-inch wrench handles up to 1.5-inch pipe — suitable for drain lines under sinks and behind toilets.

An 18-inch wrench handles up to 2-inch pipe. This is the workhorse size for most residential plumbing: main drain lines, water heater connections, and larger supply lines. A 24-inch wrench handles up to 2.5-inch pipe and provides serious leverage for stuck connections.

For home plumbing, a 14-inch and an 18-inch wrench cover nearly everything. You need two wrenches to work any threaded connection — one to hold the pipe still (backup wrench) and one to turn the fitting.

Using Pipe Wrenches Without Damage

Pipe wrenches leave tooth marks on everything they grip. On black iron pipe that will be hidden in a wall, this does not matter. On chrome supply lines, polished brass fixtures, and copper pipe, the marks are permanent and visible.

To protect finished surfaces, wrap the pipe with a strip of cloth, leather, or rubber before gripping. You can also use strap wrenches or smooth-jaw pliers for chrome and brass fittings that will remain visible.

Always pull toward you — never push a pipe wrench away. Pushing can cause the wrench to slip off and your hand to slam into the pipe. If you need to turn a fitting in the push direction, flip the wrench to the other side of the pipe.

When two wrenches are needed, position them opposite each other so the forces cancel. This prevents the pipe from flexing or the joint from twisting. The backup wrench holds against the direction of the turning wrench.

Maintenance and Jaw Replacement

Keep the adjustment nut and hook jaw threads clean and lightly oiled. Crud buildup makes the jaw stiff to adjust. A wire brush and a drop of oil after each use keeps the mechanism working smoothly.

The serrated jaw inserts (heel and hook jaw) are the parts that grip the pipe. They wear down over time and can be replaced on quality wrenches. Check for rounded teeth that slip rather than bite — this is a safety issue, not just a performance one.

Pipe wrenches are heat-treated steel and should not be used as hammers, pry bars, or cheater bars (extending the handle with a pipe for extra leverage beyond the design limit). Overloading can crack the jaw or body catastrophically.

Frequently Asked Questions