Lenovo IdeaPad S540-14IML screw size
M2 / M2.5 · 2 to 5.5 mm long
If you are replacing a screw on Lenovo IdeaPad S540-14IML, the thread is M2 and M2.5 in lengths from 2 to 5.5 mm.
There are 14 separate fitment records for it, including hinge (qty 8) (M2), I/O board (qty 1) (M2) and battery (qty 4) (M2), plus 11 more in the table below.
14 of the 14 records are marked confirmed, drawn from 1 source (download.lenovo.com).
An M2 screw is 2 mm in diameter with a 0.4 mm pitch, tapped with a 1.6 mm drill; imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable.
Lenovo IdeaPad S540-14IML 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 | 2 mm | 0.4 mm | not stated | not stated | Hinge (qty 8) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | I/O board (qty 1) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Battery (qty 4) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Display (qty 1) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Heat sink (qty 10) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Memory (qty 1) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Power button (qty 1) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | System board (qty 3) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Touchpad (qty 4) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Wireless card (qty 1) | Confirmed |
| M2 | 5.5 mm | 0.4 mm | not stated | not stated | Base cover (qty 10) | Confirmed |
| M2.5 | 4.5 mm | 0.45 mm | not stated | not stated | I/O board (qty 2) | Confirmed |
| M2.5 | 4.5 mm | 0.45 mm | not stated | not stated | DC-in (qty 2) | Confirmed |
| M2.5 | 4.5 mm | 0.45 mm | not stated | not stated | Palm rest (qty 4) | Confirmed |
Fitment records and sources
Hinge (qty 8)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
I/O board (qty 1)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Battery (qty 4)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display (qty 1)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Heat sink (qty 10)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Memory (qty 1)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Power button (qty 1)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
System board (qty 3)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Touchpad (qty 4)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Wireless card (qty 1)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Base cover (qty 10)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
I/O board (qty 2)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
DC-in (qty 2)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Palm rest (qty 4)
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 screw measures about 2 mm with calipers (usually a hair under). This device also uses M2.5, so measure each screw rather than assuming they match.
- Pitch: 0.4 mm from one thread crest to the next (25 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 2–5.5 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 heads take PH0 for Phillips and T6 for Torx, and a 1.5 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 is about 25-40 N·cm into metal threads and 12-20 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M2 / M2.5
- The standard M.2 SSD screw is M2 x 3mm, but some laptops and handhelds use non-standard lengths or head shapes.
- M.2 SSD mounting screws (M2 x 3mm) are frequently mislabeled generically as 'M.2 screws' which can be confused with the M2 metric thread designation — they do coincide numerically here but are conceptually distinct (M.2 = card format, M2 = thread size).
- Dell/HP/Lenovo manuals often list screws only by torque or head shape, so community teardowns are needed for diameter.
- M2.5 pitch is 0.45mm vs M3's 0.5mm and M2's 0.4mm — forcing the wrong one strips plastic bosses instantly.
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.
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ASUS ROG Strix G15 G513R Replacement Screws Sold Individually – M1.6 x 3mm, M2 x 2.5mm, M2 x 3mm, M2.5 x 6mm Phillips Wafer Head, Black
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ASUS ROG Strix G17 G713 Replacement Screws Sold Individually – M1.6 x 3mm, M2 x 2.5mm, M2 x 3mm, M2.5 x 6mm Phillips Wafer Head, Black
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More in Laptops & PCs
The same screw also fits
Devices whose records share a thread with Lenovo IdeaPad S540-14IML, closest length match first.
- HP Compaq Business NX9100 also M2 × 3 mm
- Acer Aspire 5538 also M2 × 3 mm
- Lenovo IdeaPad Z480 also M2 × 3 mm
- HP ProBook 460 G11 also M2 × 2 mm
- Acer TravelMate 5520G also M2 × 3 mm
- Lenovo Z51-70 also M2 × 2 mm
- Lenovo YOGA 310-11IAP also M2 × 2 mm
- Dell Vostro 15 3582 also M2 × 2 mm
Questions about Lenovo IdeaPad S540-14IML screws
- What size screw does Lenovo IdeaPad S540-14IML use?
- M2 × 2 mm for hinge (qty 8); M2 × 3 mm for I/O board (qty 1); M2 × 3 mm for battery (qty 4); M2 × 3 mm for display (qty 1); M2 × 3 mm for heat sink (qty 10); M2 × 3 mm for memory (qty 1); M2 × 3 mm for power button (qty 1); M2 × 3 mm for system board (qty 3); M2 × 3 mm for touchpad (qty 4); M2 × 3 mm for wireless card (qty 1); M2 × 5.5 mm for base cover (qty 10); M2.5 × 4.5 mm for I/O board (qty 2); M2.5 × 4.5 mm for DC-in (qty 2); M2.5 × 4.5 mm for palm rest (qty 4).
- How long are the screws in Lenovo IdeaPad S540-14IML?
- The records range from 2 to 5.5 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M2 screw?
- 0.4 mm (coarse), which is the standard pitch for M2 machine screws; a 0.25 mm fine pitch exists but is uncommon. The tap drill is 1.6 mm and the normal clearance hole is 2.4 mm.
- What screwdriver do I need for Lenovo IdeaPad S540-14IML?
- The sources do not name the drive. For M2, Phillips heads normally take PH0 and Torx heads T6; socket heads take a 1.5 mm hex key.
- Can I use an imperial screw instead of M2?
- No. Imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable. Use a true M2 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Lenovo IdeaPad S540-14IML?
- TechSpareWarehouse (our own store) lists M2 x 2mm and M2 x 3mm, which match lengths in the records above.