What are adjustable wrenches?
Adjustable wrenches use a thumbwheel and worm gear to move one jaw so a single tool fits multiple hex-nut and bolt sizes. They’re ideal for service work, installs, and repairs where fast size changes and tight spaces are common.
Key features
- Wide jaw capacity: Engraved inch/mm scales (on select models) for quick sizing.
- Slim, low-profile heads: Reach valves, traps, appliance hardware, and tight clearances.
- Precision worm gear: Smooth adjustment with minimal jaw play for a snug, non-rounding grip.
- Grip options: All-steel or cushioned handles for comfort in cold or wet conditions.
- Specialty variants: Plumber and compact 6" models, long-handle styles for extra leverage, and ratcheting adjustables for speed.
- Hang hole / lanyard loop: Storage and tethering at height (model dependent).
How do I choose the right adjustable wrench?
- Match length to the job: 6" for confined spaces; 8–10" for general maintenance; 12"+ for added leverage.
- Check jaw opening and head profile: Slim heads fit close-quarters fittings; wider heads support larger nuts.
- Select a handle style: All-steel for durability or cushioned for comfort and grip in wet/oily environments.
- Pick the purpose: For fixtures and traps, consider a plumber-oriented adjustable with a compact head and easy thumb access.
- Know when to switch: For repeated torque on one size, a fixed-size combination wrench or socket reduces rounding.
Use & care tips
- Seat the jaws fully on the flats and pull toward the fixed jaw to reduce slippage.
- Avoid using cheater bars; step up to a longer wrench when you need more leverage.
- Keep the worm gear clean and lightly oiled; wipe off debris after each use.
- Do not use on rounded or badly worn fasteners—switch to a box wrench or socket.
Common applications
- Plumbing & HVAC service, appliance installs, facility/MRO maintenance, automotive and equipment adjustments.
Related tools
- Combination & ratcheting wrench sets
- Socket & ratchet sets for high-torque work
- Pliers wrenches and tongue-and-groove pliers
- Torx/hex key sets for fixture fasteners
FAQ
Do adjustable wrenches work on both SAE and metric fasteners?
Yes. The movable jaw lets you size to inch or millimeter hex nuts; use the engraved scale (when present) as a quick guide and tighten to a snug fit.
When should I choose a ratcheting adjustable?
When you need speed in repetitive loosening/tightening without lifting the tool off the fastener—especially in tight quarters.
How do I prevent rounding fasteners?
Keep the jaws square on the flats, tighten the thumbwheel to remove play, and pull toward the fixed jaw. Switch to a box end or socket for high-torque, stuck hardware.