Size of allen screw to mount IRFP044 to heatsink? - diyAudio
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Old 22nd October 2014, 10:23 AM   #1
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Default Size of allen screw to mount IRFP044 to heatsink?

I should probably ask this in the "Construction Tips" section... but what the heck.

For my aleph-x, time to get my hands dirty....
I'd like to mount the mosfets (IRFP044) to the heatsink with the allen screws (tapped), like many of you guys do. What is the correct diameter size of the screws to do this? M2.5, M3, M5?
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Old 22nd October 2014, 10:27 AM   #2
Marra is offline Marra  United Kingdom
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I always use M3 with a large washer or a strip of 20mm wide x 2mm thick aluminium.
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Old 22nd October 2014, 10:34 AM   #3
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I always use M3 with a large washer or a strip of 20mm wide x 2mm thick aluminium.
OK thx. Since you live in UK, do you know a good source of screws? I used to buy online at Stagonset.co.uk (cheap), but the site is not accessible anymore.
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Old 22nd October 2014, 05:27 PM   #4
Nisbeth is offline Nisbeth  Denmark
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Welcome to Modelfixings

Site is a bit old (to say the least) but I have used them for at least the last five years and never had any issues.

/U.
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Old 22nd October 2014, 05:35 PM   #5
Marra is offline Marra  United Kingdom
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Originally Posted by sianturi View Post
OK thx. Since you live in UK, do you know a good source of screws? I used to buy online at Stagonset.co.uk (cheap), but the site is not accessible anymore.
I have always used brass pozidrive screws from Farnell.
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Old 22nd October 2014, 05:39 PM   #6
Marra is offline Marra  United Kingdom
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Originally Posted by Nisbeth View Post
Welcome to Modelfixings

Site is a bit old (to say the least) but I have used them for at least the last five years and never had any issues.

/U.
That's a good site. Thanks for the link.
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Old 23rd October 2014, 12:55 PM   #7
SRMcGee is offline SRMcGee  United States
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Folks:

I've purchased from Barenco in the past and have been very happy with their prices and service: Barenco - Manufacturers of hardware & supplier of cable & connectors to the communications industry - Barenco

Regards,
Scott
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Old 23rd October 2014, 01:13 PM   #8
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The devices are designed to take M3 screws.

As you used to buy from Stagonset I guess you wanted stainless? I recommend here for stainless now

Stig's Stainless Fasteners

I also use Modelfixings for threaded inserts and other stuff, always good service.
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Old 23rd October 2014, 02:17 PM   #9
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E-Bay. If you manage to buy a fake bolt it is time to curl up and die.
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