Acer Aspire 4020/5510 series screw list screw size
M2.5 · 3 to 4 mm long
If you are replacing a screw on Acer Aspire 4020/5510 series screw list, the thread is M2.5 in lengths from 3 to 4 mm.
Where it is used: screw list item 'SCREW I2.5*3M-BNIH(M2.5L3)' i.e. explicit M2.5 length 3mm screw, and 'SCREW M2.5*4L-BZN-NYLOK'.
This entry is marked confirmed and comes from manualsdir.com.
An M2.5 screw is 2.5 mm in diameter with a 0.45 mm pitch, tapped with a 2.05 mm drill; imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in.
Acer Aspire 4020/5510 series screw list screw specifications
One row per fitment record. Head, drive are shown only where the source states them; pitch is the ISO coarse pitch for the thread.
| Thread | Length | Pitch | Head | Drive | Where it goes | Status |
|---|---|---|---|---|---|---|
| M2.5 | 3–4 mm | 0.45 mm | not stated | not stated | Screw list item 'SCREW I2.5*3M-BNIH(M2.5L3)' i.e. explicit M2.5 length 3mm screw, and 'SCREW M2.5*4L-BZN-NYLOK' | Confirmed |
Fitment records and sources
Screw list item 'SCREW I2.5*3M-BNIH(M2.5L3)' i.e. explicit M2.5 length 3mm screw, and 'SCREW M2.5*4L-BZN-NYLOK'
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
How to check the screw before you buy
- Laptop covers and brackets often mix two or three lengths of the same thread, so lay the screws out in the order they came out (a magnetic mat or a sheet of paper with the hole pattern drawn on it works).
- Diameter: across the threads an M2.5 screw measures about 2.5 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.45 mm from one thread crest to the next (22.22 crests per centimetre). A thread pitch gauge or the pitch-gauge tool settles it in seconds.
- Length: measure from under the head to the tip for pan, button, wafer and cap heads; countersunk (flat) heads are measured overall.
- The records span 3–4 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M2.5 heads take PH1 for Phillips and T8 for Torx, and a 2 mm hex key for socket heads; a bit that fits loosely will cam out and strip the head.
- Tightening: no device-specific torque is published in these records. The site's general figure for M2.5 is about 45-70 N·cm into metal threads and 20-35 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M2.5
- In dental implantology, M2.5 appears as an explicit, standardized internal screw thread for implant abutment/prosthetic screw retrieval and repair taps (confirmed via Nobel Biocare), distinct from generic 'dental screw' marketing claims that lack thread specification.
- Dell/HP/Lenovo manuals often list screws only by torque or head shape, so community teardowns are needed for diameter.
Buy these screws at TechSpare Warehouse
In stock and shipped from South Carolina. Our black screws are Phillips wafer head (low profile); match the head style and length to the original before you order.
-
25x M2.5 x 3mm Phillips Screws for Acer Nitro 5 SSD M.2 WiFi Card
$5.99 -
M2.5 x 4mm Screws for Lenovo IdeaPad 5 Pro 14 Display Hinge 10-Pack Black
$4.99 -
M2.5 x 4mm Screws for Lenovo IdeaPad 5 Pro 14 System Board Hinge 10-Pack Black
$4.99
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M2.5 x 3mm Phillips Wafer Head Screws, Low Profile – 10-Pack Black
$4.99Choose size -
M2.5 x 3mm Black Wafer Head Screws for Lenovo ThinkPad S1 Yoga Display Replacement – 10-Pack Black
$4.99Choose size -
HP EliteBook 840 G8 Replacement Screws Sold Individually – M1.6 x 3mm, M2 x 2.5mm, M2 x 4mm, M2.5 x 4mm Phillips Wafer Head, Black
$0.10Choose size -
M2 x 2.5mm, M2 x 5mm, M2.5 x 4mm Phillips Wafer Head Screws Sold Individually – Black
$0.10Choose size
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Devices whose records share a thread with Acer Aspire 4020/5510 series screw list, closest length match first.
- HP 255 G6 also M2.5 × 3 mm
- Dell Latitude C800 also M2.5 × 4 mm
- Lenovo Legion Y7000P-1060 also M2.5 × 3.5 mm
- HP ProBook 4441s also M2.5 × 3 mm
- Dell Inspiron 1300x also M2.5 × 3 mm
- Lenovo 100e also M2.5 × 3 mm
- Lenovo ThinkPad L540 also M2.5 × 3.5 mm
- HP Chromebook 11 G9 Education Edition (id 38457206) also M2.5 × 3 mm
Questions about Acer Aspire 4020/5510 series screw list screws
- What size screw does Acer Aspire 4020/5510 series screw list use?
- M2.5 × 3–4 mm for screw list item 'SCREW I2.5*3M-BNIH(M2.5L3)' i.e. explicit M2.5 length 3mm screw, and 'SCREW M2.5*4L-BZN-NYLOK'.
- How long are the screws in Acer Aspire 4020/5510 series screw list?
- The records range from 3 to 4 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M2.5 screw?
- 0.45 mm (coarse), which is the standard pitch for M2.5 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.05 mm and the normal clearance hole is 2.9 mm.
- What screwdriver do I need for Acer Aspire 4020/5510 series screw list?
- The sources do not name the drive. For M2.5, Phillips heads normally take PH1 and Torx heads T8; socket heads take a 2 mm hex key.
- Can I use an imperial screw instead of M2.5?
- No. Imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in. Use a true M2.5 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Acer Aspire 4020/5510 series screw list?
- TechSpareWarehouse (our own store) lists M2.5 x 3mm and M2.5 x 4mm, which match lengths in the records above.