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Back-plate screw dimensions?

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gerhardo
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(Last edited by gerhardo; 1st March 2014 at 04:10 PM.) Reason: Updated dimensions
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Default Back-plate screw dimensions?

There were some discussions at the old Omate forum, but no confirmation on the actual specification for the back-plate and SIM screws.
As the threads are very easy to wear-out, it is not unreasonable to have to replace them every time opening the cover.
The screws seem to be difficult to find. It may be possible to get them at an Optican. Other than that, they can be ordered from something like aliexpress. The screws are normally in lots of 100 to 1000 pieces. While the cost for each screw is low, Fedex cost many times the package cost. So it is good to have the specifications confirmed early, so China Air Mail can be used.
With dimensions and a supply settled, there may be unofficial "national distribution centers".

I have a de-threaded back-plate screw and have assumed some data below

Dimension: (M1.4)
Pitch: (0.3mm (coarse, 0.2 is fine but unusual)) (There seem to be 9 threads on 3mm, so 0.3mm seem reasonable)
Back Length: 3mm
SIM length: 2 mm
Head size: 2 mm
Holes are about .5mm longer than screws and 2.1mm diameter
Quality: "Soft" (not stainless/titanium, to decrease risk that housing threading is damaged) Nickelplated OK?

I found a couple of suppliers. Those with best fit seem to have 2.5mm head. It should be possible to adjust head and length...
Cost is $6 for 200 pieces, shipping with air-mail about the same.
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kp12584
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Join Date: Feb 2014
Quote:
Originally Posted by gerhardo View Post
There were some discussions at the old Omate forum, but no confirmation on the actual specification for the back-plate and SIM screws.
As the threads are very easy to wear-out, it is not unreasonable to have to replace them every time opening the cover.
The screws seem to be difficult to find. It may be possible to get them at an Optican. Other than that, they can be ordered from something like aliexpress. The screws are normally in lots of 100 to 1000 pieces. While the cost for each screw is low, Fedex cost many times the package cost. So it is good to have the specifications confirmed early, so China Air Mail can be used.
With dimensions and a supply settled, there may be unofficial "national distribution centers".

I have a de-threaded back-plate screw and have assumed some data below

Dimension: (M1.4)
Pitch: (0.3mm (coarse, 0.2 is fine but unusual)) (There seem to be 9 threads on 3mm, so 0.3mm seem reasonable)
Back Length: 3mm
SIM length: 2 mm
Head size: 2 mm
Holes are about .5mm longer than screws and 2.1mm diameter
Quality: "Soft" (not stainless/titanium, to decrease risk that housing threading is damaged) Nickelplated OK?

I found a couple of suppliers. Those with best fit seem to have 2.5mm head. It should be possible to adjust head and length...
Cost is $6 for 200 pieces, shipping with air-mail about the same.
Great info. I am needing some new back plate screws. Would you mind posting the link to the online supplier?
 
gerhardo
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Quote:
Originally Posted by kp12584 View Post
Great info. I am needing some new back plate screws. Would you mind posting the link to the online supplier?
I do not think xda rules allows posting of direct links.
I got the screws from ebay, seller bohwu, 50 pieces. Fast and cheap.
Just search for "m1.4x4" to find more suppliers.

But it would be interesting f someone finds a good supplier for 2mm heads.
As the heads are not perfectly round after adjusting, it would be good if someone found a supplier.
All sources I found on ebay and those I looked at aliexpress either listed 2.5mm heads or had no size and a picture indicating more than 2mm.
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