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 Post subject: Thinkpad nylon screws
 Post Posted: Thu Oct 23, 2008 5:54 pm 
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Joined: Tue Jun 10, 2008 7:44 pm
Posts: 358
Location: Bellevue, WA, USA
Hi Scott,

In their service manuals IBM recommends never reusing their screws when servicing Thinkpads:

Quote:
Screw notices
Loose screws can cause a reliability problem. In the ThinkPad computer, this problem is addressed with special nylon-coated screws that have the following characteristics:
- They maintain tight connections.
- They do not easily come loose, even with shock or vibration.
- They are harder to tighten.
- Each one should be used only once.

Do the following when you service this machine:
- Keep the screw kit (for the P/N, see “Miscellaneous parts” on page 162) in your tool bag.
- Always use new screws.
- Use a torque screwdriver if you have one.


I suspect that most people ignore this advice and have no issues. What is your take on this?

Also they (IBM/Lenovo) are very specific on their recommended screw torque settings. Do you use a special driver when servicing your Thinkpads to meet these specifications?

Thanks!


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 Post subject: Re: Thinkpad nylon screws
 Post Posted: Thu Oct 23, 2008 6:24 pm 
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Joined: Sun Feb 04, 2007 11:44 am
Posts: 6100
As an experienced technician who *has* used torque wrenches extensively in the past, and who since then has become capable of judging non-critical (i.e. not life or death) fastener torque by feel, and who also knows by both look and feel when a fastener is worn to the point at which it should be replaced, I will admit that I *do* re-use the screws and do *not* use a torque wrench when working on computers in general, including ThinkPads. Your mileage may vary. <g> Scott.


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