AM4 backplate thread size

[TheLostSwede]

Yet I have 2 AM4 backplates with different threads, go figure

as a just out of interest item -
"
The #6-32 UNC is a thicker screw with a more coarse thread. This makes it more suitable for fastening larger parts and thicker materials requiring increased holding strength. Its larger size and coarse thread make it easier to work with during assembly, with less risk of cross threading. The integrated flange provides greater holding strength with less risk of pull through. The hex head makes it easier to work with during assembly with powered torque screwdrivers.

The M3 is a thinner screw with a finer thread than the #6-32 UNC. This makes it more suitable for fastening into smaller parts and thinner materials requiring good strength in a limited space. Its size and fine thread make it appropriate for applications where a #6-32 UNC would be excessively bulky without providing any other benefits versus the smaller M3."

Computer case screws - Wikipedia

en.wikipedia.org

Well, it's not M3 for sure, that's a really small screw in comparison. In fact, I don't think it's the 6-32 either, as that's a case screw and the pictures @biffzinker provided are of much longer screws with a different thread. It would seem that at least some AM4 backplates are using 3.5x20mm screws, but it doesn't seem to be universal, which is mad.

 

[sneekypeet]

AMD doesn't make any use of aftermarket screws though, their coolers use the clamping option

They absolutely use the screw option.... IMHO, most of the "cheap" solutions use clamps (or an older AIO). I would guess that 90% or more of the aftermarket coolers I test delivered screws for AMD mounting.

 

[lorry]

I'll find that out in a few days when the 6/32 screws arrive.
Plus another on one of the Optimus threads said that they x570 board, MSI godlike i think it was, uses 6/32 thread size

They absolutely use the screw option.... IMHO, most of the "cheap" solutions use clamps (or an older AIO). I would guess that 90% or more of the aftermarket coolers I test delivered screws for AMD mounting.

yet the stock cooler that comes with the 3900x uses clamping

 

[sneekypeet]

You do realize that old Optical drives mounted with 6/32 and SSDs mount with M3 (reverse that). You could answer the question by trying to run the screw into one of them. AFAIK all AMD socket screws are 6/32.

 

[lorry]

If I had any that is
I have no optical and only M.2 SSD

 

[TheLostSwede]

AMD doesn't make any use of aftermarket screws though, their coolers use the clamping option

On AM4 they screw on to the backplate, at least the Wraith coolers screw on.

You do realize that old Optical drives mounted with 6/32 and SSDs mount with M3. You could answer the question by trying to run the screw into one of them. AFAIK all AMD socket screws are 6/32.

Wrong, optical drives are M3, hard drives are 6-32. That said, those are also case screws as I pointed out elsewhere.

 

[lorry]

On AM4 they screw on to the backplate, at least the Wraith coolers screw on.

the 3900x stock cooler does not

 

[sneekypeet]

yet the stock cooler that comes with the 3900x uses clamping

I was speaking about aftermarket cooling. Speaking of stockers though, my 3600X cooler uses screws.

@TheLostSwede you are correct, I was typing faster than my brain there.

 

[biffzinker]

The screws provided with the Scythe AM4 mounting kit are longer for the four plastic spacers. Thread pitch is the same.

the 3900x stock cooler does not

I thought even those screwed into the backplate.

 

[sneekypeet]

I thought even those screwed into the backplate.

The image you provided tells the tale. The two coolers on the left use clips, the other three screw into place. It would be hard to have the square top with access to the screws.

 

[Bones]

I believe thread pitch and screw size are the same as for an AM3/AM3+ plate but the length could be different.
I can check that to confirm quickly if I must.

 

[sneekypeet]

I believe thread pitch and screw size are the same as for an AM3/AM3+ plate but the length could be different.
I can check that to confirm quickly if I must.

I was looking for an aftermarket company to describe the screws. In that journey I see Noctua have been using the same screws, as they state AMD has used the same screws since 2005.

 

[biffzinker]

I can check that to confirm quickly if I must.

I posted photos on page 1.

AM4 backplate thread size

As the title says, I am trying to find out AM4 backplate thread pitch size (the thread that air and water coolers screw into). I was told that they were M3.5 or 6/32, Finally found M3.5 (they aren't that easy to track down), but whilst they seem to be the right diameter they are not the right...

www.techpowerup.com

 

[lorry]

okay, something a bit screwy is going on here, for me anyway

http://imgur.com/fzBatXZ

This shows some PC screws (wish folk would call them bolts) clearly showing thread M3.5
Below that are the screws/bolts that I got from Accu Ltd, that also clearly state M3.5.
yet the ones from the PC screw kit fit into the AM4 backplate that I have, whilst the Accu screws do not.
Are there different metric pitches, or something?

Here are the two screws together and you can clearly see the difference

http://imgur.com/gRnb3a3

yet here is their product page where they clearly state M3.5

M3.5 x 25mm Cap Head Screws (DIN 912) - A2 Stainless Steel: Accu.co.uk: Precision Screws

Buy M3.5 x 25mm Full Thread Cap Head Screws (DIN 912) - Stainless Steel (A2) from Accu's Precision Screws range. Manufactured by AccuScrews. In stock with express worldwide delivery available.

www.accu.co.uk

 

[Bones]

I posted photos on page 1.

AM4 backplate thread size

As the title says, I am trying to find out AM4 backplate thread pitch size (the thread that air and water coolers screw into). I was told that they were M3.5 or 6/32, Finally found M3.5 (they aren't that easy to track down), but whilst they seem to be the right diameter they are not the right...

www.techpowerup.com

I guess there's no need to check......

 

[biffzinker]

Thread pitch is the same as a chassis screw.

Amazon.com: HELIFOUNER 360 Pieces Computer Standoffs Screws Assortment Kit for Hard Drive Computer Case Motherboard Fan Power Graphics : Electronics

Buy HELIFOUNER 360 Pieces Computer Standoffs Screws Assortment Kit for Hard Drive Computer Case Motherboard Fan Power Graphics: Computer Screws - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

 

[lorry]

Thread pitch is the same as a chassis screw.

View attachment 146114

yes i know (see above) yet they state that they are M3.5, which if Accu Ltd are correct, they are clearly Not.
Seeing as Accu Ltd make their living from precision screws, bolts etc, I reckon that they are likely to be the more accurate, don't you?

 

[biffzinker]

Maybe this would help answer your question finally?

Amazon.com: Pro Bamboo Kitchen 60pcs #6-32x5mm Desktop Computer PC Case Chassis Thumb Screws M3.5 Tool-Less Adjustment Thumbscrew Silver Nickel Plated: Computers & Accessories

Buy Pro Bamboo Kitchen 60pcs #6-32x5mm Desktop Computer PC Case Chassis Thumb Screws M3.5 Tool-Less Adjustment Thumbscrew Silver Nickel Plated: Computer Screws - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

 

[lorry]

Maybe this would help answer your question finally?
View attachment 146116

Amazon.com: Pro Bamboo Kitchen 60pcs #6-32x5mm Desktop Computer PC Case Chassis Thumb Screws M3.5 Tool-Less Adjustment Thumbscrew Silver Nickel Plated: Computers & Accessories

Buy Pro Bamboo Kitchen 60pcs #6-32x5mm Desktop Computer PC Case Chassis Thumb Screws M3.5 Tool-Less Adjustment Thumbscrew Silver Nickel Plated: Computer Screws - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

Sure looks to have, thanks.
So Why the hell do they get called M3.5 then?

 

[biffzinker]

Why the hell do they get called M3.5 then?

Looks like there referring to the size of the head (3) and length (5) of the screw.

Honestly I don't know why.

 

[lorry]

Looks like there referring to the size of the head (3) and length (5) of the screw.

Don't think so, as with my boxed set they state M3.5 x 5 (5 being the length)
Looks more to me to be the diameter, according to your picture.
But How messed up is that? Use metric diameter but imperial thread !

 

[TheLostSwede]

Sure looks to have, thanks.
So Why the hell do they get called M3.5 then?

Because, as I pointed out earlier, Chinese companies aren't very good with standards. They use metric-ish and decided to translate the imperial standards to nearest metric equivalent...

 

[lorry]

Sheesh !

 

[TheLostSwede]

But How messed up is that? Use metric diameter but imperial thread !

Because metric is more accurate?

 

[lorry]

but mixing the two up? Gawd!

What size tyre do you want? oh, 25 inches by 200 mm please

Think I'll beat my head with a mallet, it'd be less painful