How Max Jaw Capacity is Measured for a Wrench
Wrenches or spanners are versatile hand tools with a central role in industries from plumbing to automotive repair and electronics. One factor you might come across when shopping for adjustable wrenches is ‘max jaw capacity’—but what does this term mean, and how is it measured?
You’ll find all the answers you need in this article!
What is max jaw capacity?
A wrench’s max jaw capacity is the maximum size its opening can reach. You’ll often see the term when shopping around for adjustable wrenches, which come in a broad range of sizes.
Modern wrenches typically have a maximum jaw capacity ranging from 4mm to 60mm and beyond. Smaller jaw sizes are great for high-precision jobs, while the larger sizes are ideal for heavy-duty industrial work.
Manufacturers and tool suppliers will typically list the minimum and maximum capacity of each adjustable spanner they sell on their website, although sometimes, only the maximum opening size is available.
A typical 150mm wrench may have a maximum jaw capacity of 20mm, while a 250mm wrench could have a max of 30mm. These sizes can vary from manufacturer to manufacturer, so always check the item description before you make an investment for your business.
Why is it important to know a wrench’s max jaw capacity?
Knowing the maximum jaw capacity of the wrench you purchase is essential for choosing the right tool for the job. If you choose a wrench with a max capacity that’s too small, you could risk slippage or damage when adjusting your pipe or fastener.
Using an inappropriately-sized wrench holds several risks, including:
- Injury to yourself and others
- Damage to the equipment you’re working on
- Damage and degradation to the tool itself
Always use a correctly sized tool to increase its longevity and keep yourself, your employees, and the equipment you work with safe.
How jaw capacity is measured
When you’re shopping for an adjustable spanner, or if you look at the tool itself, you’ll typically see two measurements—the overall length and the maximum jaw capacity.
The overall length describes the length of the entire tool. But sometimes, it may represent the length of the handle only.
As we touched on above, maximum jaw capacity describes the maximum fastener size a tool can handle. To measure it, manufacturers look at a tool’s maximum tolerance of its nut dimension across flats, so the actual size of the jaw may be slightly larger.
You can usually determine an adjustable spanner’s maximum jaw capacity by looking at the scale etched along its jaws. This scale allows for quick fastener measurement and shows the minimum and maximum sizes.
Conclusion
Adjustable wrenches are an essential tool in any tradie’s toolbox. From tightening and loosening nuts and bolts to assembling and disassembling pipes, they have endless uses across industries.
An important factor to consider when purchasing an adjustable wrench is its maximum jaw size. Using the tips and information in this article, you should have no trouble choosing an appropriately-sized wrench for your business’s next project.