An adjustable spanner, also called an adjustable wrench, is a versatile hand tool designed to turn nuts, bolts, and other fasteners of various sizes. Its key feature is an adjustable jaw, which can be widened or narrowed to fit different fastener sizes, eliminating the need for multiple fixed-size wrenches. Here’s a concise overview based on your previous mention and the topic:
 
Primary Use: Tightening or loosening fasteners (e.g., nuts, bolts) of varying sizes, making it ideal for trades like plumbing, automotive, construction, and general maintenance.
 
Design: Typically consists of a handle, a fixed jaw, and a movable jaw adjusted via a worm gear or screw mechanism. Common materials include chrome-vanadium steel for durability.
 
Advantages:
Versatility: One tool handles multiple fastener sizes.
Portability: Reduces the need to carry multiple tools.
Widely available and cost-effective.
 
Common Sizes: Available in lengths from 4 inches to over 24 inches, with jaw capacities ranging from small (e.g., 0-20mm) to large (e.g., up to 60mm), depending on the model.
 
Tips for Use:
Adjust the jaw to fit snugly to avoid slipping or rounding off fasteners.
Apply force in the direction of the fixed jaw for better grip and less wear.
Clean and lubricate the adjustment mechanism to maintain smooth operation
 
Limitations:
Less precise than fixed wrenches, with potential for slipping if not adjusted properly.
Bulkier than specialized tools for specific fastener sizes.