Lenovo IdeaPad S540-15 screw size
M1.6 / M2 / M2.5 / M3 · 2 to 5 mm long
Our records put Lenovo IdeaPad S540-15 on M1.6, M2, M2.5 and M3 screws in lengths from 2 to 5 mm.
There are 14 separate fitment records for it, including touchpad (qty 6) (M1.6), hard drive (qty 4) (M2) and hinge (qty 8) (M2), plus 11 more in the table below.
14 of the 14 records are marked confirmed, drawn from 1 source (download.lenovo.com).
An M1.6 screw is 1.6 mm in diameter with a 0.35 mm pitch, tapped with a 1.25 mm drill; imperial look-alike: #1-72 UNF (1.85 mm) is larger; there is no true imperial equivalent.
Lenovo IdeaPad S540-15 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 |
|---|---|---|---|---|---|---|
| M1.6 | 2.3 mm | 0.35 mm | not stated | not stated | Touchpad (qty 6) | Confirmed |
| M2 | 2 mm | 0.4 mm | not stated | not stated | Hard drive (qty 4) | Confirmed |
| M2 | 2 mm | 0.4 mm | not stated | not stated | Hinge (qty 8) | Confirmed |
| M2 | 2 mm | 0.4 mm | not stated | not stated | Power button (qty 1) | Confirmed |
| M2 | 2 mm | 0.4 mm | not stated | not stated | Wireless card (qty 1) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | I/O board (qty 4) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Battery (qty 3) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Fan (qty 3) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Heat sink (qty 6) | 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 | System board (qty 6) | Confirmed |
| M2 | 5 mm | 0.4 mm | not stated | not stated | Base cover (qty 9) | Confirmed |
| M2.5 | 4 mm | 0.45 mm | not stated | not stated | Display (qty 6) | Confirmed |
| M3 | 3 mm | 0.5 mm | not stated | not stated | Hard drive (qty 4) | Confirmed |
Fitment records and sources
Touchpad (qty 6)
pitch 0.35 mm · tap 1.25 mm · clearance 1.8 mm · PH00 / Torx T4–T5
Hard drive (qty 4)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Hinge (qty 8)
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
Wireless card (qty 1)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
I/O board (qty 4)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Battery (qty 3)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Fan (qty 3)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Heat sink (qty 6)
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
System board (qty 6)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Base cover (qty 9)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display (qty 6)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Hard drive (qty 4)
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
How to check the screw before you buy
- A screw that is even 1 mm too long in a laptop base can push into the keyboard, battery or a board trace, so match the length position by position.
- Diameter: across the threads an M1.6 screw measures about 1.6 mm with calipers (usually a hair under). This device also uses M2 / M2.5 / M3, so measure each screw rather than assuming they match.
- Pitch: 0.35 mm from one thread crest to the next (28.57 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 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M1.6 heads take PH00 for Phillips and T4–T5 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 M1.6 is about 12-20 N·cm into metal threads and 6-10 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M1.6 / M2 / M2.5 / M3
- Headphone hinge screw sizes are usually quoted from screwdriver bit size, not an actual thread spec - measure before buying.
- 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.
- Power-tool gearcase and clamshell screws are usually thread-forming (marked "ST") even when the parts list gives an M-size — a normal machine screw of the same size may not hold in the plastic boss.
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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More in Laptops & PCs
The same screw also fits
Devices whose records share a thread with Lenovo IdeaPad S540-15, closest length match first.
- Lenovo 330S-15IKB also M2 × 3 mm
- HP Spectre x360 13-ac0xx also M2 × 2 mm
- Lenovo Y730 also M2 × 2 mm
- Acer Aspire 4315 also M2 × 3 mm
- HP Special Edition L2000 also M2 × 5 mm
- Dell Latitude 3520 also M2 × 2 mm
- Lenovo ThinkPad T530i also M2 × 3 mm
- Dell Inspiron 17 3790 also M2 × 2 mm
Questions about Lenovo IdeaPad S540-15 screws
- What size screw does Lenovo IdeaPad S540-15 use?
- M1.6 × 2.3 mm for touchpad (qty 6); M2 × 2 mm for hard drive (qty 4); M2 × 2 mm for hinge (qty 8); M2 × 2 mm for power button (qty 1); M2 × 2 mm for wireless card (qty 1); M2 × 3 mm for I/O board (qty 4); M2 × 3 mm for battery (qty 3); M2 × 3 mm for fan (qty 3); M2 × 3 mm for heat sink (qty 6); M2 × 3 mm for memory (qty 1); M2 × 3 mm for system board (qty 6); M2 × 5 mm for base cover (qty 9); M2.5 × 4 mm for display (qty 6); M3 × 3 mm for hard drive (qty 4).
- How long are the screws in Lenovo IdeaPad S540-15?
- The records range from 2 to 5 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M1.6 screw?
- 0.35 mm (coarse), which is the standard pitch for M1.6 machine screws; a 0.2 mm fine pitch exists but is uncommon. The tap drill is 1.25 mm and the normal clearance hole is 1.8 mm.
- What screwdriver do I need for Lenovo IdeaPad S540-15?
- The sources do not name the drive. For M1.6, Phillips heads normally take PH00 and Torx heads T4–T5; socket heads take a 1.5 mm hex key.
- Can I use an imperial screw instead of M1.6?
- No. Imperial look-alike: #1-72 UNF (1.85 mm) is larger; there is no true imperial equivalent. Use a true M1.6 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Lenovo IdeaPad S540-15?
- TechSpareWarehouse (our own store) lists M2 x 2mm, M2 x 3mm and M2 x 5mm, which match lengths in the records above.