Don’t Have a 7/32 Drill Bit? Use These Genius Hacks Instead!
You’re in the middle of a project. The instructions are clear, the parts are laid out, and you’re ready to make the final connections. Then you hit a snag: the instructions call for a 7/32″ drill bit, and you don’t have one in your kit. It’s a frustratingly specific size that isn’t always included in standard sets, and it can bring your work to a screeching halt.
Before you give up and head to the hardware store, you have options. Understanding the alternatives and workarounds can save you time, money, and a lot of frustration. This guide will walk you through the best solutions when you find yourself without this very specific tool.
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Why the Right Drill Bit Size is Non-Negotiable
First, it’s important to understand why using the correct drill bit size matters. A hole that is too small can cause a screw to bind, split the material (especially in wood), or even break the head off the fastener. A hole that is too large will not allow the threads to grip properly, resulting in a weak and unreliable connection.
The 7/32″ drill bit is often required for creating pilot holes for larger screws, installing wall anchors, or for specific tap and die applications where thread precision is critical. While getting the exact size is ideal, “close enough” can often work if you know which alternatives to use and what precautions to take.
It’s a similar principle to other DIY challenges; just as you wouldn’t use the wrong product for a clog and risk learning the hard way if Drano is bad for pipes, using the wrong tool here can cause damage.
Stuck Without a 7/32 Drill Bit? Here’s Your Action Plan
The key to finding a substitute is understanding drill bit sizing systems. A 7/32″ drill bit has a decimal equivalent of 0.2188 inches. Your goal is to find another bit in your collection that is as close to this measurement as possible. Let’s explore the most practical solutions.
Solution 1: Find the Closest Alternative Size
Most drill bit sets come with fractional, metric, and sometimes numbered bits. One of these is likely to be a suitable replacement for the 7/32″ bit. You’ll need to find a bit that is either slightly smaller or slightly larger, depending on your specific task.
Metric Alternative: The closest and most common metric equivalent is a 5.5mm drill bit. A 5.5mm bit measures 0.2165 inches, which is only 0.0023 inches smaller than a 7/32″ bit. This tiny difference makes it an excellent substitute for creating a pilot hole, as the screw will have plenty of material to grip securely.
Numbered Alternative: If you have a set with numbered wire gauge bits, look for a #2 drill bit. A #2 bit measures 0.2210 inches, making it just 0.0022 inches larger than 7/32″. This is a great option if the hole needs to provide a little clearance or if you’re working with a softer material where a slightly larger hole won’t compromise the fastener’s grip.
Slightly Smaller Fractional Bit: The next fractional size down in most standard sets is 3/16″ (0.1875 inches). This is significantly smaller and should only be used as a starting point if you plan to widen the hole afterward.
Slightly Larger Fractional Bit: The next size up is typically 15/64″ (0.2344 inches), which is often too large and may prevent the fastener from holding securely. It’s generally safer to drill a hole that is slightly too small than one that is too large.
Solution 2: Widen a Slightly Smaller Hole
If the only alternatives you have are slightly smaller bits, like a 5.5mm or even a 3/16″ bit, you can drill a smaller pilot hole and then carefully enlarge it. This method requires a steady hand but can be very effective. Precision is key in many DIY projects, from drilling holes to determining if you can put Lifeproof vinyl flooring under cabinets.
- Drill the Pilot Hole: Start by drilling a hole with the closest smaller bit you have. Ensure the hole is straight and centered.
- Widen Carefully: Once the initial hole is drilled, you can use the same drill bit to widen it. Gently move the spinning bit in a circular motion around the edges of the hole. Apply very light pressure to slowly shave away material until you reach the desired diameter.
- Use a Reamer or File: For more precision, especially in metal, a hand reamer is the perfect tool to gradually enlarge a hole. Alternatively, a small round file can be used to carefully enlarge the opening in wood or plastic.
This approach gives you excellent control and reduces the risk of making the hole too big. It’s a reliable technique used by professionals when a precise fit is needed and the exact drill bit isn’t available.
Solution 3: Re-evaluate Your Hardware
In some situations, it may be easier to change the fastener than to improvise the hole. If you are using a specific screw or anchor that requires a 7/32″ hole, consider if a slightly smaller screw that fits a 3/16″ or 5.5mm hole would provide adequate strength for your project. This is often a viable option for non-structural applications like hanging decor or installing light-duty shelving.
Drill Bit Conversion Chart: Your Ultimate Guide
When you’re missing a specific bit, a conversion chart is your best friend. It helps you visualize how different sizing systems relate to each other and allows you to quickly identify the best alternative in your toolbox.
| Drill Bit Size | Decimal Equivalent (Inches) | Difference from 7/32″ (0.2188″) | Recommendation |
|---|---|---|---|
| 7/32″ (Target Size) | 0.2188″ | N/A | Ideal Size |
| 5.5 mm | 0.2165″ | -0.0023″ (Smaller) | Excellent alternative, slightly tighter fit. |
| #3 Drill Bit | 0.2130″ | -0.0058″ (Smaller) | Good alternative, especially for softer materials. |
| #2 Drill Bit | 0.2210″ | +0.0022″ (Larger) | Good alternative for a looser fit or clearance hole. |
| 3/16″ | 0.1875″ | -0.0313″ (Smaller) | Use as a pilot hole to be enlarged later. |
| 15/64″ | 0.2344″ | +0.0156″ (Larger) | Use with caution; likely too large for a secure fit. |
When You Absolutely MUST Use a 7/32 Bit
While the workarounds are effective in many cases, there are times when you should not compromise. If you are drilling for a machine screw that will be tapped, using the precise tap drill size is critical for creating strong, clean threads. An incorrect pilot hole size can result in weak or stripped threads.
Similarly, for critical structural connections or when working with hardened materials, the manufacturer’s recommendation should be followed exactly. In these scenarios, pausing the project to acquire the correct 7/32″ bit is the safest and most professional choice. Sometimes, unexplained issues in home systems, like when you hear water running in your sump pump, require precise solutions, and the same applies to your tools.
Frequently Asked Questions
What can I use if I don’t have a 7/32″ drill bit?
If you don’t have a 7/32″ drill bit, the best alternative depends on your project. For clearance holes, a slightly larger bit like a 15/64″ may work. If you are drilling a pilot hole for a screw, it’s often better to use a slightly smaller size to ensure a tight fit.
What is the metric equivalent of a 7/32″ drill bit?
A 7/32″ drill bit is approximately equal to 5.56 millimeters. If you have a metric drill bit set, a 5.5mm bit is a very close substitute.
Can I use a 15/64″ or 1/4″ drill bit instead?
A 15/64″ drill bit is slightly larger than a 7/32″, and a 1/4″ is even larger. While they might work for creating a clearance hole, they are likely too big for applications requiring a precise fit, such as tapping threads. Using a bit that is too large can result in weak threads that may not hold.
What is the decimal equivalent of a 7/32″ drill bit?
The decimal equivalent of a 7/32″ drill bit is 0.2188 inches. Knowing the decimal equivalent can help you find suitable substitutes in metric or other sizing systems.
Why is using the exact drill bit size so important?
Using the correct drill bit size is crucial for ensuring the integrity of fasteners. If a pilot hole is too small, it can cause the material to split or the screw to break. If the hole is too large, especially for tapping threads, the fastener won’t hold securely.
Is a 7/32″ a common drill bit size?
While 7/32″ drill bits are readily available, they may not be included in all standard drill bit sets. Sets often prioritize sizes in 1/16 or 1/8 inch increments, making sizes like 7/32″ slightly less common in basic kits.
Preventing the Missing Drill Bit Problem in the Future
The best way to solve this problem is to prevent it from happening again. Investing in a comprehensive drill bit set that includes less common sizes like 7/32″ can be a huge time-saver for any serious DIYer or homeowner. Look for sets that include fractional, metric, and numbered sizes to cover all your bases.
Ultimately, not having a 7/32″ drill bit is a common but solvable problem. By understanding the decimal equivalents and knowing your alternatives, you can confidently choose a substitute bit or use a simple technique to modify a smaller hole. With these solutions in your back pocket, a missing drill bit will be a minor hiccup, not a project-ending disaster.
