Dell Inspiron 6400x screw size
M2 / M2.5 / M3 · 2.7 to 8 mm long
The screws used on Dell Inspiron 6400x are M2, M2.5 and M3 in lengths from 2.7 to 8 mm.
There are 16 separate fitment records for it, including battery (qty 1) (M2), display (qty 8) (M2) and unspecified (qty 1) (M2), plus 13 more in the table below.
16 of the 16 records are marked confirmed, drawn from 1 source (dl.dell.com).
M2 means a 2 mm nominal diameter with a 0.4 mm thread pitch. Imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable.
Dell Inspiron 6400x 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 | 2.7 mm | 0.4 mm | not stated | not stated | Battery (qty 1) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Display (qty 8) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Unspecified (qty 1) | Confirmed |
| M2.5 | 4.2 mm | 0.45 mm | not stated | not stated | Display bezel (qty 6) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Battery (qty 3) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Card reader (qty 6) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Display (qty 2) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Fan (qty 2) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Keyboard (qty 2) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Speaker (qty 2) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | System board (qty 3) | Confirmed |
| M2.5 | 8 mm | 0.45 mm | not stated | not stated | Display (qty 2) | Confirmed |
| M2.5 | 8 mm | 0.45 mm | not stated | not stated | Optical drive (qty 3) | Confirmed |
| M2.5 | 8 mm | 0.45 mm | not stated | not stated | Palm rest (qty 11) | Confirmed |
| M3 | 3 mm | 0.5 mm | not stated | not stated | Battery (qty 2) | Confirmed |
| M3 | 3 mm | 0.5 mm | not stated | not stated | Hard drive (qty 2) | Confirmed |
Fitment records and sources
Battery (qty 1)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display (qty 8)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Unspecified (qty 1)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display bezel (qty 6)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Battery (qty 3)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Card reader (qty 6)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Display (qty 2)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Fan (qty 2)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Keyboard (qty 2)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Speaker (qty 2)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
System board (qty 3)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Display (qty 2)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Optical drive (qty 3)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Palm rest (qty 11)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Battery (qty 2)
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
Hard drive (qty 2)
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 2.7–8 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 / M3
- The standard M.2 SSD screw is M2 x 3mm, but some laptops and handhelds use non-standard lengths or head shapes.
- Dell/HP/Lenovo manuals often list screws only by torque or head shape, so community teardowns are needed for diameter.
- Server drive caddy screws (Dell, HP) are usually M3 in very short lengths (3-4mm) because they bite into thin sheet metal — they are NOT the 6-32 UNC screws that go into the drive's own side holes.
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 3mm Screws for Dell XPS 13 9340 Base Cover SSD Shield 10-Pack Black
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10x M2 x 3mm Phillips Screws for Lenovo ThinkPad X131e Chromebook WiFi SSD
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M2.5 x 4mm Screws for Lenovo IdeaPad 5 Pro 14 Display Hinge 10-Pack Black
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M2.5 x 4mm Screws for Lenovo IdeaPad 5 Pro 14 System Board Hinge 10-Pack Black
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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 Dell Inspiron 6400x, closest length match first.
- Dell Inspiron 5160 also M2 × 3 mm
- HP ProBook 655 G2 also M2 × 3 mm
- HP Pavilion dv6000 also M2 × 3 mm
- Lenovo ZhaoYang E49 also M2 × 3 mm
- Acer Swift / Aspire palmrest also M2 × 3 mm
- Lenovo Yoga Slim 7 14AKP10 also M2 × 3 mm
- HP Compaq Evo N600c also M2.5 × 5 mm
- Dell Alienware x17 R2 also M2 × 3 mm
Questions about Dell Inspiron 6400x screws
- What size screw does Dell Inspiron 6400x use?
- M2 × 2.7 mm for battery (qty 1); M2 × 3 mm for display (qty 8); M2 × 3 mm for unspecified (qty 1); M2.5 × 4.2 mm for display bezel (qty 6); M2.5 × 5 mm for battery (qty 3); M2.5 × 5 mm for card reader (qty 6); M2.5 × 5 mm for display (qty 2); M2.5 × 5 mm for fan (qty 2); M2.5 × 5 mm for keyboard (qty 2); M2.5 × 5 mm for speaker (qty 2); M2.5 × 5 mm for system board (qty 3); M2.5 × 8 mm for display (qty 2); M2.5 × 8 mm for optical drive (qty 3); M2.5 × 8 mm for palm rest (qty 11); M3 × 3 mm for battery (qty 2); M3 × 3 mm for hard drive (qty 2).
- How long are the screws in Dell Inspiron 6400x?
- The records range from 2.7 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 Dell Inspiron 6400x?
- 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 Dell Inspiron 6400x?
- TechSpareWarehouse (our own store) lists M2 x 2.5mm, M2 x 3mm and M2.5 x 4mm, which match lengths in the records above.