### Author Topic: #4 screw  (Read 3153 times)

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#### airman00

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##### #4 screw
« on: December 17, 2007, 02:49:31 PM »
I need to make a hole on a CAD

What size diameter does a #4 machine screw go through?   Would 3/8" be good?

P.S. I cannot test it out tonight and so I need an answer today
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#### JonHylands

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##### Re: #4 screw
« Reply #1 on: December 17, 2007, 03:06:40 PM »
A #4-40 machine screw goes through a 1/8" hole without touching the sides. 7/64 makes a much tighter fit, but hard to slide in and out. I usually drill my #4-40 clearance holes to 1/8".

If you want to drill a hole to tap for #4-40, you need to drill a hole using a #43 drill bit, which is roughly 0.089".

- Jon

#### SomeSaba

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##### Re: #4 screw
« Reply #2 on: December 17, 2007, 04:23:50 PM »
does anyone have a site that has a chart for all these?

They come in handy.. and i can never find them online

#### JonHylands

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##### Re: #4 screw
« Reply #3 on: December 17, 2007, 05:03:57 PM »

#### airman00

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##### Re: #4 screw
« Reply #4 on: December 17, 2007, 06:36:29 PM »
Thanks guys,
i got this equation to convert # into inches

Diameter = ( # x .013") + .06"
So a #4 screw would be .58" in diameter

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#### JonHylands

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##### Re: #4 screw
« Reply #5 on: December 17, 2007, 06:58:30 PM »

(4 * 0.013") + 0.06" = 0.112"

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#### airman00

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##### Re: #4 screw
« Reply #6 on: December 17, 2007, 08:02:52 PM »

(4 * 0.013") + 0.06" = 0.112"

- Jon

lol  , i realized that !    I was about to go back and correct the post, since I realized a .58" diameter screw is pretty thick, way too think for a #4/

anyway I used a 5/32" bit
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#### JonHylands

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##### Re: #4 screw
« Reply #7 on: December 17, 2007, 08:32:05 PM »
5/32" will be way too big - your screw will wobble like crazy.

5/32" = 0.156"

I typically use 1/8", which is 0.125"...

- Jon

#### airman00

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##### Re: #4 screw
« Reply #8 on: December 17, 2007, 08:36:00 PM »
thanks jon

1/8 it is !

i think i'm going to go to sleep now, i had no sleep in the past 24 hours

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