1

Score

Avatar
Thor Simon
37

Asked

Replacement heatsink hold-down pins?

History

I need replacement heatsink hold-down pins (spring loaded plastic pins) for the CPU heatsink on my A1176. On the second CPU upgrade the one-way ends (under the logic board) snapped off two pins despite careful handling.

I don't want to buy a whole $100 dysfunctional mini on eBay just to get heatsink pins! I came up empty with Digi-Key and other component suppliers. Anyone have any ideas?

Edited by: oldturkey03 ( ) , machead3 ( )

Post Answer

2

Score

Avatar
rj713
70.9k

Answered

Accepted Answer

PermalinkHistory

Others have had the same problem and the solution they found was to use nylon screws, washers and nuts in the place of the pins.

They discovered that a one inch 4-40 nylon screw was the correct size to replace the pin. In fact, they say they have replaced all four pins with these nylon screws. You need to trim the screws using a pin as a guide for length and allow for the washer. Hope this helps. Ralph

That's an excellent suggestion, thanks. Though I'm a little worried about the performance of the nylon screws under constant load -- is there some reason to not use metal?

Thor Simon,

Possibility of shorting something. Ralph

rj713,

0

Score

Avatar
Thor Simon
37

Answered

PermalinkHistory

McMaster-Carr sells nylon socket-head cap screws in 4-40 and a huge variety of lengths. Measuring from under the head of the original nylon pin to the bottom of the solid portion gives exactly 11/16, while I get 25/32 to the bottom of the pointed one-way part below the solid part. So 11/16 or 3/4 should be the correct length. With a cap screw no washer *should* be necessary -- I guess I'll find out!

I've ordered a couple of bags and when I get it set up just right I'll post the part numbers here.

0

Score

Avatar
Athanassios Diacakis
1

Answered

PermalinkHistory

Did you ever get the part numbers?

Thanks

Thanos

0

Score

Avatar
J White
1

Answered

PermalinkHistory

McMaster Carr part numbers:

3/4" 4-40 white nylon screw: 93135A278

4-40 white nylon hex nut: 94812A200

Bear in mind this is for 100 of each. Approximate cost for both $11 USD.

Hope that helps.

Add Your Answer

View Statistics:

Today: 0

This Week: 0

This Month: 59

All Time: 4,934