Drill bits are available in a variety of sizes to verify that each job is finished precisely. To encourage precision, each one employs a separate nomenclature, such as letters, figures, and fractions.
In many cases, a #8 screw necessitates the use of a 1/8″ linear drill bit. Moreover, the perfect size of the drill bit varies due to the materials, and when functioning with soft materials, you’ll require a relatively narrower pilot hole.
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When selecting what size of drill bit for #8 screws, you must consider a number of factors. The screw type, substances used, and thread layout must all be considered.
What is #8 Screw Means?
The diameter will describe their dimension, threads for every inch (partial loads with a nut or in a hole drilled), and length in inches. The more the number, the bigger the size in all situations. As a result, a #8 screw is bigger as compared to a #4 screw, and a 3 inch bolt is bigger than a 2 inch bolt.
How To Determine The Drill Bit Size For a #8 Screw?
Knowing what size drill bit to use for #8 screws will assist you in creating pilot holes that would permit these rivets to safely connect components.
The diameter of the drill bit used to bore pilot holes for rivets is specified by the drill bit size. The drill bit size mentions the pilot holes diameter that can be made, but it should not be the same as the screw diameter for the threads to pierce the stuff.
Drill bit sizes come in a variety of sizes, with some suitable dimensions found in most toolboxes. The ISO standard expresses the sizes in millimeters, whereas the ANSI device requires bits of inches.
Please remember that almost all marketing drill bits have a diameter that is noticeably narrower than the fact because the drill bit’s path can shift slightly, resulting in a broader diameter.
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For most situations, manual uses with a center punch and drill have compassion for .080 inches or 2 mm. For a more strategic tool, this compassion is reduced to .020 inches or.5 mm.
Drill Bit To Screw Size Chart for #8 Screws
Screw Size |
Pilot hole size for softwood |
Pilot hole size for hardwood |
#2 |
1/16″ |
1/16″ |
#3 |
1/16″ |
5/64″ |
#4 |
1/16″ |
5/64″ |
#5 |
5/64″ |
3/32″ |
#6 |
3/32″ |
7/64″ |
#7 |
3/32″ |
7/64″ |
#8 |
7/64″ |
1/8″ |
#9 |
1/8″ |
9/64″ |
#10 |
1/8″ |
9/64″ |
#12 |
9/64″ |
5/32″ |
#14 |
5/32″ |
11/64″ |
#16 |
11/64″ |
3/16″ |
#18 |
13/64″ |
7/32″ |
#20 |
7/32″ |
15/64″ |
#24 |
1/4″ |
17/64″ |
What Size Drill Bit For #8 Screw Metal
If you’re dealing with self-tapping screws of type A, AB, or B, or thread-breaking screws of type 25, you could use a #29 drill bit for your pilot hole.
When using elevated thread-forming screws, the #30 drill bit for a #8 screw is recommended for components with an elastic strength greater than 200,000 PSI. If your materials are less than that, a #31 drill bit is the best alternative.
If you’re dealing with #8 screwdriver or U-drive screws, then for your pilot hole, the #27 drill bit size is suitable.
How does Drill Bit Sizing for #8 Screws Work?
A basic rule of thumb is to get the bit’s diameter to match the shaft of the screw without taking the distended threads into consideration. This system lets the threads break into the substances and behave as a dependable, no-play fastener.
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This basic rule should not be applied in every scenario. Don’t stop to mention how various materials react and what weight the screw can support.
It’s also critical to consider the various types of bits. You’ll get U-shaped pilot holes with right-angle walls if you’re using a straight drill bit.
