# How big should a pilot hole be for a screw?

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For most hardwoods, the pilot hole should be at least as large as the screw’s minor diameter. If the screw has deep threads, or the wood is very hard, the pilot hole should be another 1/64-in. larger than the minor diameter. For softer woods, the pilot hole can be 1/64-in.

Also, What size pilot hole do I need for a number 10 screw?

Hereof, What size head is a #10 screw?

How do you measure a screw hole?

If you have to buy the nuts too, then that’s easy to match the bolts when you find them. You can measure the hole with a tape measure, as long as you are VERY accurate. Measure at the widest part of the circle and get it to the closest millimeter if you can.

Likewise, How do I know what size screw to use?

The most important factor in screw selection is length. The general rule of thumb is that the screw should enter at least half the thickness of the bottom material, e.g. 3/4″ into a 2 x 4.

## 19 Related Question Answers Found

### What is the standard screw size?

Screws have three basic measurements: gauge, threads per inch, and shaft length in inches. So, you may also see a measurement like 6-32 x 1 1/2″. This means it’s a #6 diameter, with 32 threads per inch (almost double the normal thread count as a standard wood screw) and an inch and a half long.

### What diameter is a size 6 screw?

Threads per Inch Pitch (inches) Pitch (mm)
—————- ————– ———-
9 0.1111 2.822
8 0.1250 3.175
7 0.1429 3.629
6 0.1667 4.233

### How do I know what size screw I need?

The most important factor in screw selection is length. The general rule of thumb is that the screw should enter at least half the thickness of the bottom material, e.g. 3/4″ into a 2 x 4.

### Is a 8 or 10 screw bigger?

Machine screws are often found in sizes of: 0, 1, 2, 3, 4, 5, 6, 8, 10, 12, 14—the larger the number, the larger the screw.

### How big of a pilot hole should I drill?

As a general rule, a pilot hole should be the same diameter as the root of the screw (the center core just below the threads). This allows the bulk of a screw to enter a board without splitting the grain, yet still allow the threads to do their work of pulling two boards together to form a joint.

### What is a #6 screw?

This means it’s a #6 diameter, with 32 threads per inch (almost double the normal thread count as a standard wood screw) and an inch and a half long. When the middle number is absent (6 x 1 1/2″), the screw has the “normal” number of threads per inch for that size and type of screw (for #6 wood screws that’s 18).

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### How big is a screw head?

A size 32 screw was given a head diameter of one inch and a shank diameter of half inch. A size 0000 has a head diameter of 108/1000 of an inch and a shank diameter of 54/1000 of an inch.

### What size is a #8 bolt?

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