Stupid screws and LED question - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 03-10-2014, 01:56 AM Thread Starter
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Stupid screws and LED question

I've decided to screw some new LED's onto aluminum barstock.
Most LED heatsinks you buy have 2 small screws, metric I assume..

Well I have a 2-56 tap and some #50 drill bits so I can drill and tap al I want using 2-56 screws which are a thinner shaft than the ones w/ the heat sinks but head is the same size so no problem there.
I looked for nylon washers to isolate the head from the LED base but I haven't had any luck w/ that yet..

One thing I found is nylon screws w/ a thermal rating of up to 150-ish F

Also found stainless steel..
The ones I have I assume are zinc plated..

Question is : Is any better than the others?.. In the high moisture env. and warmth of the LED's (My non-fan cooled can reach 120F on certain parts of the aluminum.. )..

Feelings about galv. corrosion w/ zinc and aluminum..

To make this really dull thread a bit more exciting.. anyone have any feelings re: using anodized vs non-anodized aluminum?
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post #2 of 8 (permalink) Old 03-10-2014, 03:28 AM
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Stainless for the win.

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Quote me as saying I was misquoted.
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post #3 of 8 (permalink) Old 03-10-2014, 03:37 AM Thread Starter
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Stainless for the win.
Yea that was the direction I was leaning to...
Means buying new screws..Local HW didn't carry ss that small..

I can't believe the redundant purchases I've done lately...
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post #4 of 8 (permalink) Old 03-10-2014, 03:41 AM
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Think how nice it would look with polished stainless instead of aluminum.

Dilution is the solution for the pollution.
Quote me as saying I was misquoted.
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Here's to our wives and sweethearts - may they never meet.
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post #5 of 8 (permalink) Old 03-10-2014, 03:42 AM
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When I use screws to hold LEDs I use #4-40 screws, and they are still small enough that it generally takes a couple of taps to get through all of the holes. I would never even consider #2 screws for anything. I haven't tried, nor have I seen #4-40 nylon screws, but I would certainly use them if they are easy to buy. It doesn't take much to hold a LED in place, and those screws would eliminate the possibility of shorting out a LED.

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post #6 of 8 (permalink) Old 03-10-2014, 04:00 AM
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http://www.fastener-express.com/4-40...Qty.-50-2.aspx

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post #7 of 8 (permalink) Old 03-10-2014, 06:20 AM
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Quote:
Originally Posted by Hoppy View Post
When I use screws to hold LEDs I use #4-40 screws, and they are still small enough that it generally takes a couple of taps to get through all of the holes. I would never even consider #2 screws for anything. I haven't tried, nor have I seen #4-40 nylon screws, but I would certainly use them if they are easy to buy. It doesn't take much to hold a LED in place, and those screws would eliminate the possibility of shorting out a LED.
X2. 4-40s are as small as I will go. Pretty easy to snap a tap off, even in aluminum. So buy two... when you break the first one, you will be more careful with the second!

Quote:
Originally Posted by GraphicGr8s View Post
Think how nice it would look with polished stainless instead of aluminum.
Are you referring to the bar stock?
Stainless has horrible heat transfer numbers compared to aluminum.

http://www.engineeringtoolbox.com/th...ity-d_429.html

It weighs 3 times as much also.

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Last edited by Darkblade48; 03-10-2014 at 11:34 AM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #8 of 8 (permalink) Old 03-10-2014, 12:36 PM Thread Starter
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X2. 4-40s are as small as I will go. Pretty easy to snap a tap off, even in aluminum. So buy two... when you break the first one, you will be more careful with the second!


Screws that come w/ some star puck heat sinks are about a 3......
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