Dell Inspiron 16 7640 2-in-1 screw size
M1.6 / M2 / M2.5 · 2 to 5.5 mm long
The screws used on Dell Inspiron 16 7640 2-in-1 are M1.6, M2 and M2.5 in lengths from 2 to 5.5 mm.
There are 16 separate fitment records for it, including touchpad (M1.6), display (M1.6) and wireless card (M1.6), plus 13 more in the table below.
16 of the 16 records are marked confirmed, drawn from 1 source (dell.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.
Dell Inspiron 16 7640 2-in-1 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 | 2.5 mm | 0.35 mm | not stated | not stated | Touchpad | Confirmed |
| M1.6 | 3 mm | 0.35 mm | not stated | not stated | Display | Confirmed |
| M1.6 | 3 mm | 0.35 mm | not stated | not stated | Wireless card | Confirmed |
| M2 | 2 mm | 0.4 mm | not stated | not stated | Base cover | Confirmed |
| M2 | 2 mm | 0.4 mm | not stated | not stated | Display | Confirmed |
| M2 | 2 mm | 0.4 mm | not stated | not stated | Speaker | Confirmed |
| M2 | 2 mm | 0.4 mm | not stated | not stated | SSD | Confirmed |
| M2 | 2 mm | 0.4 mm | not stated | not stated | Touchpad | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Base cover (qty 8) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Battery | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | not stated | I/O board | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | not stated | Battery | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | not stated | Fan | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | not stated | System board | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | not stated | USB-C board | Confirmed |
| M2.5 | 5.5 mm | 0.45 mm | not stated | not stated | Hinge | Confirmed |
Fitment records and sources
Touchpad
pitch 0.35 mm · tap 1.25 mm · clearance 1.8 mm · PH00 / Torx T4–T5
Display
pitch 0.35 mm · tap 1.25 mm · clearance 1.8 mm · PH00 / Torx T4–T5
Wireless card
pitch 0.35 mm · tap 1.25 mm · clearance 1.8 mm · PH00 / Torx T4–T5
Base cover
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Speaker
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
SSD
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Touchpad
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Base cover (qty 8)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Battery
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
I/O board
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Battery
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Fan
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
System board
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
USB-C board
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Hinge
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 M1.6 screw measures about 1.6 mm with calipers (usually a hair under). This device also uses M2 / M2.5, 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 2–5.5 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
- M1.6 is the most common laptop-internal micro screw after M2 — Dell XPS keyboards specifically call out M1.6 x 1.5mm, and generic M2 substitutes strip the bracket.
- 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.
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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M1.6 x 3mm Screws Compatible with Dell XPS 13 9340 Keyboard 10-Pack Black
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M1.6 x 3mm Screws for Dell XPS 13 9340 System Board Replacement 10-Pack Black
$4.99
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10x M2 x 2mm Phillips Screws for HP EliteBook 840 G6 846 G6 SSD WiFi
$4.99 -
M2 x 2mm Phillips Flat Head Screw for HP EliteBook 840/846 G6 Laptop Repair - Pack of 100 Black
$7.99
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M2 x 3mm Screws for Dell XPS 13 9340 Base Cover SSD Shield 10-Pack Black
$4.99 -
10x M2 x 3mm Phillips Screws for Lenovo ThinkPad X131e Chromebook WiFi SSD
$4.99
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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
$0.10Choose size -
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
$0.10Choose size
More in Laptops & PCs
The same screw also fits
Devices whose records share a thread with Dell Inspiron 16 7640 2-in-1, closest length match first.
- Lenovo V15 Gen 6 i also M2 × 2 mm
- Acer TravelMate 8371 also M2 × 2 mm
- Lenovo V730-13 also M2 × 3 mm
- Acer Aspire 8940 also M2 × 3 mm
- Lenovo ThinkPad Tp13 also M2 × 3 mm
- HP Compaq nx6325 also M2 × 3 mm
- HP EliteBook 828 G4 also M2 × 2 mm
- Lenovo ZhaoYang E4430 also M2 × 2 mm
Questions about Dell Inspiron 16 7640 2-in-1 screws
- What size screw does Dell Inspiron 16 7640 2-in-1 use?
- M1.6 × 2.5 mm for touchpad; M1.6 × 3 mm for display; M1.6 × 3 mm for wireless card; M2 × 2 mm for base cover; M2 × 2 mm for display; M2 × 2 mm for speaker; M2 × 2 mm for SSD; M2 × 2 mm for touchpad; M2 × 3 mm for base cover (qty 8); M2 × 3 mm for battery; M2 × 4 mm for I/O board; M2 × 4 mm for battery; M2 × 4 mm for fan; M2 × 4 mm for system board; M2 × 4 mm for USB-C board; M2.5 × 5.5 mm for hinge.
- How long are the screws in Dell Inspiron 16 7640 2-in-1?
- 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 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 Dell Inspiron 16 7640 2-in-1?
- 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 Dell Inspiron 16 7640 2-in-1?
- TechSpareWarehouse (our own store) lists M1.6 x 3mm, M2 x 2mm and M2 x 3mm, which match lengths in the records above.