1. ## Fan screw thread pitch?

You would think this would be an easily answered question, but I can't find the answer anywhere!

Apparently I have two different fan screws with two different thread pitches.

I know one is 5mm diameter, with a T16 pitch. The other is 4.9mm with a T14 pitch.

What does T16 and T14 actually mean? And which one is "standard"?

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I have absolutely no idea.

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Originally Posted by Jon Gerow
You would think this would be an easily answered question, but I can't find the answer anywhere!

Apparently I have two different fan screws with two different thread pitches.

I know one is 5mm diameter, with a T16 pitch. The other is 4.9mm with a T14 pitch.

What does T16 and T14 actually mean? And which one is "standard"?
IS it a Torx head screw?

"Torx head sizes are described using the capital letter "T" followed by a number ranging from T1 to T100."
https://en.wikipedia.org/wiki/Torx

But, you are saying that the screw actually lists itself as T14 pitch and it is metric? I've never seen that. AS you know:

M8-1.0 x 20

Here's what the description means…

8 = Nominal diameter, in millimeters

20 = Length, in millimeters (see below)

This example illustrates how a coarse threaded screw may appear…

M12 x 25 = 12 mm diameter, coarse thread is assumed (1.75 mm), 25 mm long

M12 is a matching coarse threaded nut
https://www.fastenermart.com/underst...fasteners.html

4. Originally Posted by DWD1961
IS it a Torx head screw?

"Torx head sizes are described using the capital letter "T" followed by a number ranging from T1 to T100."
https://en.wikipedia.org/wiki/Torx

But, you are saying that the screw actually lists itself as T14 pitch and it is metric? I've never seen that. AS you know:

M8-1.0 x 20

Here's what the description means…

8 = Nominal diameter, in millimeters

20 = Length, in millimeters (see below)

This example illustrates how a coarse threaded screw may appear…

M12 x 25 = 12 mm diameter, coarse thread is assumed (1.75 mm), 25 mm long

M12 is a matching coarse threaded nut
https://www.fastenermart.com/underst...fasteners.html
No. They're not Torx.

And yes, metric screws are usually measured in threads per mm.

These are actually measured in TPI despite having metric diameters and lengths.

https://imgur.com/a/sxodioY

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Originally Posted by Jon Gerow
No. They're not Torx.

And yes, metric screws are usually measured in threads per mm.

These are actually measured in TPI despite having metric diameters and lengths.

https://imgur.com/a/sxodioY
What next? Amazing.

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