What Size Drill Bit For #8 Screw The Ultimate Guideline

Accept that it is not simple to determine what size drill bit is needed to drill a precise hole. Different tasks may call for the use of a specific drill bit size. But Now we’ll describe what size drill bit for #8 screw

Drilling holes for screws isn’t something most people do regularly, so knowing how big a drill bit you need for a #8 fastener might be challenging. So our engineers are here to lend a hand and do it via this post.

As a result, drill bits exist in various diameters to accommodate any task. In addition, each one has a unique system of labeling—letters, numerals, or fractions—to encourage precision.

All drill bit violations may be expressed as a fraction of a 64th. As a result, the smallest is 1/64th, and the biggest is 63/64th in size. Then you would round them down to the next integer: a 2/64 bit would become a 1/32.

There are different numbers, ranging from 1 to 80; the highest number represents the tiniest drill bit.

When settling on a drill bit size for #8 screws, multiple factors should be considered. The screw variety, materials, and thread pattern must all be considered. 

What is Drill Bit #8 Screw?

Standard screw sizes range from M3 to M16. There are a total of 14 different digits, starting with 00. For instance, the diameter of a #8 screw is 0.164′′ or 5/ 32′′ to its closest whole number. The threads per inch on a size eight screw might be 32, 36, or 40..

What is Drill Bit #8 Screw

These screws have a wide variety of uses and are widely distributed. Therefore, knowing the drill bit size for the #8 screw is crucial when working on various tasks. For example, you must have plenty of #8 screws when working with wood. You can use these instruments to fasten wood to a wall, secure thick board, and fasten fiberboard and door frames. In addition, it can help save your wood from being stripped around screws.

In addition, it is frequently employed for joining metal sheets. You may recognize these fasteners by their pan heads and continuous threading along the bolt.

What Size Drill Bit Do I Need for #8 Screws?

Using #8 screws, you’ll need to find out what size drill bit to use to make pilot holes for attachment.

The diameter of the hole can be determined by the size of the drill bit used to make pilot holes for various fasteners. That doesn’t imply the hole’s diameter has to match the screws, though.

Drill bits exist in various standard sizes included in most tool sets. The International Organization for Standardization recommends using millimeters when referring to bits, whereas the American National Standard Institute recommends using fractions of an inch. Typically, the actual diameter of a commercial drill bit is less than what is claimed because of the arc the bit follows.

What Size Drill Bit for #8 Screw?

The typical diameter of the threads on a #8 screw is 0.164 inches. Therefore, the thread count of a screw is just as crucial as the screw’s diameter when trying to find the right size and shape for a specific project.

Multiple drill bit varieties

You may choose from 32, 36, or 40 thread counts for your #8 screws. Thread count, sometimes called thread pitch, is the ratio of threads to an inch.

Type-Based Drill Bit Selection

The options for drill bits are practically endless. Additionally, other materials like metal, wood, or stone require the use of specialised drill bits..

Listed below are some typical drill bit applications:

A close inspection of the little, pointed drill bits often used for wood reveals that they can spur on any side.

Masonry bits have carbide coatings and slanted tips. Drills with carbide coatings tend to retain their sharpness for longer. You may also use these drills with great success on stone, tile, and cinder blocks.

Drilling through tiles, however, may be a tedious and untidy process. That’s why masonry drills are the tools of choice for such jobs.

Drill bits of metal have a broad angle and a sharp, blackened tip. Because of their adaptability, they are often regarded as the most effective type of practice. Also, the titanium coating makes them exceptionally effective and durable.

Glass may also be drilled through, albeit it requires more accuracy than other materials. Therefore, drills with a carbide coating are employed when extreme precision is required.

Choosing the Right Drill Bit Size

The drill bit you need for a specific task may be determined with a hole chart that comes packaged with the bit. If you’re still confused, though, you may always use a bit that’s 1/64 inch smaller than the hole size you need.

When working with hardwood, it’s best to make pilot holes that are somewhat bigger in diameter than the screws themselves.

Standard or tapered bits are used. In addition, the size number often indicates a screw’s diameter. This means that when screw sizes increase, the screw’s diameter also increases.

Using a drill bit size card is another crucial piece of advice that can be implemented when creating drills. To determine the appropriate drill bit size, use the plastic cards pre-punched with circular holes.

The drill’s 90-degree angle connection provides the most ease of use and precision when drilling. In addition, it’s lightweight, small, and believed to be easy on the hands.

Drills may cause serious injury if handled carelessly. Therefore it’s essential always to ensure they’re correctly connected to the board.

Hardwood requires a pilot hole that is 1/8″ in diameter, whereas softwood requires a hole that is 3/32″ in diameter.

Standard center punch and drill tolerances for hand tools are.080 inches (2 mm). For finer detail work, this tolerance can be reduced.020″ (or.5mm).

An Explanation of the #8 Screw Drill Bit Sizing Process

Making sure the bit’s diameter is compatible with the tool’s shaft is a crucial criterion when selecting a bit for a specific fastener type. This prevents the sticking-out threads from detracting from the item’s aesthetic value.

This rule might be helpful in some situations, but it shouldn’t be used universally. Instead, consider the many factors that influence the strength and stability of the materials you use.

Also, while drilling pilot holes, it’s crucial to think about the many kinds of bits available. For example, a U-shaped hole with straight walls can be drilled with a straightforward drill.

There are two common types of pilot holes: the V-shaped one and the tapered one. A bigger drill bit diameter will result in a more secure connection, whereas a smaller drill bit diameter will result in a more compact one.

Which size screw do you recommend for a #8 hole?

When drilling into hardwoods like maple, oak, or walnut, a 1/8′′ straight jobber drill bit is your best bet. Alternatively, you may make pilot holes using the bottom of a No. 8 drill.

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What size drill bit do I use for a #8 screw-in metal?

A #8 screw’s diameter equals a 1/8″ straight drill bit. That’s equal to 3.17 and quarter millimeters, or 0.125 inches.

A #8 screw’s diameter equals a 1/8″ straight drill bit. That’s equal to 3.17 and quarter millimeters, or 0.125 inches?

In most cases, the diameter of the pilot hole should match that of the screw’s head. Unfortunately, drilling the pilot hole too small is a typical error among woodworkers who mistakenly believe the screw would have more traction in a narrower opening.


Learning the ins and outs of drilling cannot be accomplished on the weekend. To drill a hole that is just the correct size is made of the proper material, and fulfills the necessary function takes time and focus. However, drilling is a standard, simple procedure.

As a result, you need to solidify your understanding of the relevant details.

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