Lenovo ThinkPad G40 screw size
M2 / M2.5 / M3 · 3 to 8 mm long
The screws used on Lenovo ThinkPad G40 are M2, M2.5 and M3 in lengths from 3 to 8 mm.
There are 20 separate fitment records for it, including wireless card (qty 2, black) (M2), display (qty 4, silver) (M2) and display bezel (qty 2, silver) (M2), plus 17 more in the table below.
Head and drive, as the sources state them: Hex socket (Allen) drive.
20 of the 20 records are marked confirmed, drawn from 1 source (thinkpad-manuals.retropc.se).
For reference, M2 is 2 mm across the threads at 0.4 mm pitch. The imperial size people confuse it with: #2-56 UNC (2.18 mm) is close but not interchangeable.
Lenovo ThinkPad G40 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 | 3.5 mm | 0.4 mm | not stated | not stated | Wireless card (qty 2, black)black finish | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | not stated | Display (qty 4, silver) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | not stated | Display bezel (qty 2, silver) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | not stated | Heat sink (qty 3, silver) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | not stated | Unspecified (qty 1, silver) | Confirmed |
| M2.5 | 3 mm | 0.45 mm | not stated | not stated | Bracket (qty 1, silver) | Confirmed |
| M2.5 | 3 mm | 0.45 mm | not stated | not stated | Display (qty 1, silver) | Confirmed |
| M2.5 | 3 mm | 0.45 mm | not stated | not stated | Palm rest (qty 1, silver) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Bracket (qty 3, silver) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Display (qty 6, black,silver)black finish | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Optical drive (qty 3, silver) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Speaker (qty 1, silver) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | System board (qty 2, silver) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Unspecified (qty 2, silver) | Confirmed |
| M2.5 | 7 mm | 0.45 mm | not stated | not stated | Display (qty 9, black,silver)black finish | Confirmed |
| M2.5 | 7 mm | 0.45 mm | not stated | not stated | Keyboard (qty 2, black)black finish | Confirmed |
| M2.5 | 7 mm | 0.45 mm | not stated | not stated | Palm rest (qty 9, black)black finish | Confirmed |
| M2.5 | 8 mm | 0.45 mm | not stated | not stated | Card reader (qty 4, black,silver)black finish | Confirmed |
| M2.5 | 8 mm | 0.45 mm | not stated | not stated | Unspecified (qty 1, black)black finish | Confirmed |
| M3 | 4 mm | 0.5 mm | not stated | Hex socket (Allen) | Hard drive (qty 1, black, Hex socket)black finish | Confirmed |
Fitment records and sources
Wireless card (qty 2, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display (qty 4, silver)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display bezel (qty 2, silver)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Heat sink (qty 3, silver)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Unspecified (qty 1, silver)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Bracket (qty 1, silver)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Display (qty 1, silver)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Palm rest (qty 1, silver)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Bracket (qty 3, silver)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Display (qty 6, black,silver)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Optical drive (qty 3, silver)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Speaker (qty 1, silver)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
System board (qty 2, silver)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Unspecified (qty 2, silver)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Display (qty 9, black,silver)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Keyboard (qty 2, black)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Palm rest (qty 9, black)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Card reader (qty 4, black,silver)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Unspecified (qty 1, black)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Hard drive (qty 1, black, Hex socket)
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
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 / M3, 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 3–8 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source names a Hex socket (Allen) drive. For comparison, standard M2 heads take PH0 (Phillips) or T6 (Torx), or a 1.5 mm hex key.
- 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 / M3
- 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).
- Nylon-coated M2.5 screws (ThinkPad Edge) are thread-locking; plain replacements work loose over time.
- 3.5in desktop and enterprise hard drives are 6-32 UNC imperial, not M3 - only the 2.5in form factor is metric.
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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M2 x 4mm Phillips Wafer Head Machine Screws Black 50-Pack Laptop SSD Repair
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25x M2.5 x 3mm Phillips Screws for Acer Nitro 5 SSD M.2 WiFi Card
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M2.5 x 5mm Screws Compatible with Dell XPS 14 9440 Display Assembly 10-Pack
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M2.5 x 5mm Phillips Wafer Head Screw for Action Camera Protective Housing - Pack of 50 Black
$4.79 each · min. 2
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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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Dell Latitude 5530 Replacement Screws Sold Individually – M2 x 3mm, M2 x 4mm, M2.5 x 5mm 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 ThinkPad G40, closest length match first.
- HP EliteBook Folio 1020 G1 also M2 × 4 mm
- HP EliteBook 640 G11 also M2 × 3.5 mm
- HP nc6110 also M2 × 4 mm
- HP ProBook 4530s also M2 × 4 mm
- Dell XPS 15 9510 also M2 × 4 mm
- Dell Latitude 3189 2-in-1 also M2.5 × 7 mm
- HP Chromebook™ x360 11 G4 EE also M2 × 4 mm
- Lenovo IdeaPad S400 Touch also M2.5 × 5 mm
Questions about Lenovo ThinkPad G40 screws
- What size screw does Lenovo ThinkPad G40 use?
- M2 × 3.5 mm for wireless card (qty 2, black); M2 × 4 mm for display (qty 4, silver); M2 × 4 mm for display bezel (qty 2, silver); M2 × 4 mm for heat sink (qty 3, silver); M2 × 4 mm for unspecified (qty 1, silver); M2.5 × 3 mm for bracket (qty 1, silver); M2.5 × 3 mm for display (qty 1, silver); M2.5 × 3 mm for palm rest (qty 1, silver); M2.5 × 5 mm for bracket (qty 3, silver); M2.5 × 5 mm for display (qty 6, black,silver); M2.5 × 5 mm for optical drive (qty 3, silver); M2.5 × 5 mm for speaker (qty 1, silver); M2.5 × 5 mm for system board (qty 2, silver); M2.5 × 5 mm for unspecified (qty 2, silver); M2.5 × 7 mm for display (qty 9, black,silver); M2.5 × 7 mm for keyboard (qty 2, black); M2.5 ×.
- How long are the screws in Lenovo ThinkPad G40?
- The records range from 3 to 8 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 ThinkPad G40?
- The source lists a Hex socket (Allen) drive. Standard M2 heads otherwise take PH0 (Phillips) or T6 (Torx), or 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 ThinkPad G40?
- TechSpareWarehouse (our own store) lists M2 x 4mm, M2.5 x 3mm and M2.5 x 5mm, which match lengths in the records above.